How citations work on this page: Every superscript number (e.g., 2) links to the Primary Source Directory at the bottom of this page, where you'll find the direct URL to the official government bulletin, SAE engineering standard, or diagnostic reference behind the claim. Sources labeled “Secondary” are trade or training references used for context, not as the primary factual authority.
The First Fork: Does the Engine Crank?
Before touching a single component, listen to what the car does when you turn the key. That one observation — whether the engine's internal rotating assembly moves at all — splits every no-start into one of two entirely different investigations.1
A no-crank, no-start condition means the starter motor never spins the engine. You hear silence, a single click, or rapid clicking, but the engine itself never physically turns. This points upstream of the engine — to the battery, the wiring, the starter, or the circuit that controls them.
A crank, no-startcondition means the starter does its job — the engine spins at a normal cranking speed, sometimes for several seconds — but the self-sustaining combustion cycle never catches. This points downstream of the starter, into the systems the engine needs to actually run: fuel, ignition, mechanical compression, or the computer's permission to combine them.2
If your car clicks — either a rapid machine-gun chatter or a single heavy clunk — that is a no-crank symptom with its own detailed acoustic diagnosis. We cover that specific sound in full in Why Does My Car Click When I Try to Start It? This report treats clicking as one branch of the no-crank category and spends the rest of its length on the full diagnostic map — including the crank-no-start failures that produce no clicking at all.
The Four-Pillar Framework Behind Every Start
For most of automotive history, engineers described combustion with a simple triad: pressurized, atomized fuel; a precisely timed high-voltage spark; and enough mechanical cylinder compression to make the mixture volatile. Any one of the three missing, and the engine cannot run.
Computerized engine management and anti-theft networking added a fourth, non-negotiable requirement: digital authorization. Before the engine control module will route fuel or fire a spark plug, it must first complete a verified cryptographic handshake with the vehicle's immobilizer system. Without that handshake, the computer actively withholds fuel and spark — the engine can crank indefinitely and never have a chance to start.3,4
Battery, cables, starter and its control circuit — must exist before the engine can even turn.
Pressurized, measured fuel delivered to the cylinder at the correct instant.
A high-voltage spark (or heat of compression) at the right moment, inside a cylinder that can actually seal.
The immobilizer's cryptographic approval to release fuel and spark to the engine at all.
A no-crank condition is always a Pillar 1 failure. A crank-no-start condition is always a failure in Pillar 2, 3, or 4 — and, occasionally, a Pillar 4 failure so severe that it also prevents cranking, by refusing to close the starter relay in the first place.
No-Crank Diagnostics: Battery, Cables & Electrical Circuit
The starter motor is the single most power-hungry device in your car, briefly demanding hundreds of amperes the instant it engages. Whether the battery can supply that current — not just whether it reads a healthy voltage at rest — is the deciding factor in almost every no-crank complaint.
Cold Cranking Amps and the SAE J537 Standard
A battery's ability to deliver starter-level current is rated in Cold Cranking Amps (CCA) — the sustained current a 12-volt battery can deliver at −18°C (0°F) for exactly 30 seconds while holding at least 7.2 volts, under the SAE J537 storage-battery standard.5 Temperature restricts this capacity severely: the sulfuric acid electrolyte thickens as it cools, and the chemical reaction inside the plates slows down with it. At 0°F, a standard battery's available cranking power falls to roughly 40% of what it delivers at a warm 77°F.6 That is why a battery that started the car every morning in August can fail on the first cold snap of the year without having changed at all — the demand went up as the supply went down.
Minimum recommended CCA scales with engine size and fuel type. Diesel engines compress air far harder than gasoline engines to trigger ignition, so their starters demand significantly more current to overcome that resistance.
Minimum CCA by Engine Displacement
| Engine Displacement | Gas — Warm Climate | Gas — Cold Climate | Diesel — Warm Climate | Diesel — Cold Climate |
|---|---|---|---|---|
| 1.0–1.5L (small car) | 300–400 CCA | 450–550 CCA | 450–600 CCA | 650–800 CCA |
| 1.6–2.5L (sedan) | 400–550 CCA | 550–700 CCA | 600–800 CCA | 800–1,000 CCA |
| 2.6–4.0L (SUV/truck) | 550–700 CCA | 700–850 CCA | 800–1,000 CCA | 1,000–1,200 CCA |
| 4.1–6.0L (large truck) | 650–800 CCA | 800–1,000 CCA | 950–1,200 CCA | 1,200–1,500 CCA |
| 6.1L+ (heavy duty) | 800–1,000 CCA | 1,000–1,300 CCA | 1,200–1,500 CCA | 1,500–2,000 CCA |
Minimum CCA recommendations by standard engine configuration.6 Replacement batteries should meet or exceed the OEM-specified CCA for your specific engine and climate.
Why 12.6 Volts Doesn't Mean “Healthy”
A battery resting at 12.6 volts looks fine on a multimeter, but voltage at rest only measures surface charge, not the battery's ability to sustain current under load. As a battery ages, lead-sulfate crystals harden permanently on the plates — a process called sulfation— raising internal resistance. The battery can still show a full resting voltage, but the moment the starter demands several hundred amps, that internal resistance collapses the voltage far below the threshold the starter solenoid needs, producing the rapid clicking covered in our starter-clicking guide. Open circuit voltage and specific gravity — the density of the battery's electrolyte compared to water — move together as a battery discharges, which is why both are used to estimate state of charge before running a load test.7
| State of Charge | Specific Gravity | Open Circuit Voltage |
|---|---|---|
| 100% charged | 1.265 | 12.6V or higher |
| 75% charged | 1.225 | 12.4V |
| 50% charged | 1.190 | 12.2V |
| 25% charged | 1.155 | 12.0V |
| Discharged | Below 1.120 | 11.9V or lower |
The Battery That Passes Every Test but Dies Overnight
Sometimes a battery tests perfectly healthy but still turns up dead after the car sits overnight. In that case, the cause is not the battery — it is a parasitic draw: a module that fails to enter its low-power “sleep” state and keeps pulling current long after the ignition is off.8A small standby draw of roughly 15 milliamps would take months to drain a healthy battery. A stuck relay or a module that won't sleep, pulling 1 to 2 full amps continuously, will exhaust the same battery's reserve capacity in under 24 hours.8 Technicians isolate the offending circuit by measuring the millivolt drop across each fuse in the box while the vehicle is fully asleep — a 0.00 mV reading means no current is flowing through that circuit, while any measurable drop points straight at the fuse feeding the draw.
Why a Passing Continuity Test Can Still Be Wrong
Even a battery in perfect health cannot crank the engine if the cable carrying its current has gone bad — and the standard way most people check a cable, a static continuity test with a multimeter, can miss this entirely. A heavy battery cable is made of hundreds of fine copper strands bundled together. If corrosion severs all but one strand, a multimeter's tiny test current still finds a path and reports a perfect zero-ohm reading. The moment the starter demands 200+ amps through that single remaining strand, the resistance in that thin thread of copper generates intense heat, the voltage collapses to near zero, and the starter never gets the current it needs.10 Only a dynamic voltage drop test — measuring the voltage lost across a connection while current is actually flowing during cranking — catches this failure.10
Manufacturer bulletins put hard numbers on how much voltage a healthy starting circuit is allowed to lose. One NHTSA-published bulletin covering specific light-duty trucks and SUVs traced a starting failure and loss of power-steering assist to a loose connection at the battery fuse block and a poor chassis ground at location G218. The remedy specified exact torque values to eliminate the resistance: 7 Nm (62 lb-in) for the battery clamps, 15 Nm (11 ft-lb) for the fuse block connections, and 45 Nm (33 ft-lb) for the engine block ground eyelet — and rejected any positive cable showing more than 100 millivolts of drop, or negative cable showing more than 200 millivolts, under load.9 The same bulletin documented a second, unrelated failure mode on the same vehicles: a rotated starter heat shield physically contacting the battery-positive terminal ring, shorting it directly to ground and drawing unregulated current that can melt the surrounding harness.9
If your car clicks instead of staying silent, the click pattern itself — rapid chatter versus a single heavy clunk — narrows this section down considerably. See Why Does My Car Click When I Try to Start It? for the full acoustic diagnostic breakdown, including amp-draw specifications by engine configuration.
No-Crank Diagnostics: Starter Motor & Charging System
If the battery and cables check out but the engine still won't crank, the failure has moved downstream to the starter motor itself, or upstream in time to the alternator that was supposed to keep the battery charged in the first place. For a full breakdown of starter internals — the solenoid, the pull-in and hold-in coils, worn carbon brushes, and burnt contacts — see our dedicated starter-clicking guide. Two failures worth isolating here are less obvious and don't always announce themselves with a click.
For general reference on how much current a healthy starter should demand, see our car battery replacement guide for the load-test thresholds technicians use to separate a bad battery from a bad starter.
Alternator Diode Failure and “AC Ripple”
Once the engine is running, the alternator recharges the battery and powers the electrical system by spinning a rotor inside a stationary ring of copper coils — a process that generates Alternating Current (AC). Because the battery and every computer module run on Direct Current (DC), the alternator routes that AC through a bridge rectifier — a set of one-way electrical valves called diodes — to convert it.11When a diode thermally degrades and fails, it lets unrectified AC “ripple” back into the DC system. Because the ripple mimics the shape of a real sensor signal, it can confuse the engine and body computers, causing erratic shifting, random stalling, and starting failures that look electrical but trace back to a bad diode.11 The industry standard caps healthy AC ripple at 0.5 volts peak-to-peak on a 14-volt system; anything above 1.0 volt indicates diode failure serious enough to require alternator replacement.11
This failure rarely produces an instant no-start. Instead, it slowly undercharges the battery over days or weeks with no obvious warning sign, until the battery finally can't supply enough current to crank the car — at which point the symptom looks exactly like a dead battery, even though the battery itself is not the root cause.
Crank, No-Start: Mechanical Compression & Leak-Down
Once you've confirmed the engine cranks at a normal speed, the investigation shifts entirely. The starter and battery are no longer suspects. Now the question is whether the engine can trap and compress the air-fuel mixture tightly enough to ignite it.
As the piston travels upward with both valves closed, it squeezes the mixture into a fraction of its original volume, which raises its temperature and density until it becomes volatile enough to combust.12 If piston rings are worn, valves are burned, or the head gasket has ruptured, that pressurized air simply escapes past the leak during the upward stroke, and the cylinder never reaches a pressure capable of supporting combustion — so the engine can crank indefinitely and never fire.12
A healthy gasoline engine typically produces 130 to 189 PSI of cranking compression, and no single cylinder should read more than 10% below the others.12 If one cylinder reads far lower than the rest, technicians squirt a small amount of heavy oil into that cylinder and retest: if compression jumps back up, the oil temporarily sealed worn rings or a scored cylinder wall; if it stays low, the leak is at the top of the cylinder — a stuck or burned valve, or a valve held open by incorrect camshaft timing.12
To pinpoint the exact leak, a static leak-down test pressurizes the cylinder with 100 PSI of shop air at Top Dead Center and lets a technician listen for where it escapes.
| Where the Air Escapes | Diagnostic Conclusion |
|---|---|
| Intake manifold / throttle body | Leaking, bent, or carbon-fouled intake valves |
| Exhaust pipe (tailpipe) | Leaking or burned exhaust valves |
| Open oil filler cap / dipstick tube | Severely worn piston rings or cylinder wall damage |
| Neighboring spark plug hole | Blown head gasket breaching an adjacent cylinder |
| Bubbles in radiator coolant | Blown head gasket, cracked block, or cracked cylinder head |
Auditory and visual mapping used during static cylinder leak-down testing.12
If large volumes of air escape uniformly across every cylinder, both intake and exhaust, the cause is usually catastrophic: a snapped timing belt or a timing chain that has jumped a tooth. Once the crankshaft and camshafts lose synchronization, the valves open and close at the wrong moment in the piston's stroke, no cylinder can seal, and the engine becomes mechanically incapable of starting no matter how long it cranks.12
Crank, No-Start: Fuel Delivery Failures
If compression tests out fine, the next question is whether fuel is actually reaching the cylinder in the right quantity and at the right pressure. Modern engines don't rely on gravity — they use staged, high-pressure hydraulic systems that must hold exact tolerances to atomize fuel correctly.
Low-Pressure Supply and the Volume Trap
An electric pump submerged in the fuel tank pushes liquid fuel up through the lines to the engine. A failed pump motor, a blown pump relay, or a badly clogged filter produces an immediate crank-no-start condition.2 A standard multiport injection system should hold a steady 58 to 62 PSI at the fuel rail with the ignition on and the engine off.2But pressure alone doesn't guarantee the pump can deliver enough volume — a pump with worn internals can slowly build 60 PSI against a closed system, then collapse the moment the injectors actually open and demand flow. A healthy low-pressure pump should deliver at least one pint of fuel in 15 to 30 seconds when volume-tested at the rail.13
Gasoline Direct Injection and Common Rail Diesel
Direct-injection gasoline engines and diesels add a second, engine-mounted high-pressure pump that takes the low-pressure supply and compresses it dramatically further before it ever reaches the injector.
Fuel Pressure by System Type
| System Type | Pressure Range | Pump Location |
|---|---|---|
| Low-pressure transfer | 40–120 PSI | In-tank or frame-mounted |
| High-pressure (GDI) | 2,000–3,000 PSI | Engine-mounted, cam-driven |
| High-pressure (commercial common rail) | 23,000–29,000 PSI | Gear-driven on engine block |
Fuel pressure specifications across modern automotive fuel-delivery architectures.14
On GDI systems, the high-pressure pump isn't electric at all — it's driven mechanically by a lobe on the engine's camshaft, and the computer regulates output through a digitally controlled Flow Control Valve (FCV) on the pump's inlet. During the plunger's downstroke, a spring holds the FCV open so fuel is drawn in; to build pressure, the engine control unit energizes the FCV at a precise moment during the upstroke, sealing the inlet so the plunger compresses the trapped fuel through a check valve into the rail.14 If the computer fails to pulse the FCV — from a sensor fault or an electrical short in the solenoid — the valve never seals, fuel simply flows back out on every stroke, and the rail never reaches the pressure combustion requires.14
Hard Starts After Sitting: Pressure Leak-Down and Vapor Lock
When the engine shuts off, one-way check valves inside the pump and pressure regulator are supposed to trap residual pressure in the lines. That trapped pressure keeps fuel from boiling off engine heat (vapor lock) and makes liquid fuel instantly available at the injectors the moment you turn the key.15 If a car cranks unusually long after sitting overnight, that residual pressure is escaping — through a failed check valve in the pump module, a ruptured diaphragm in the pressure regulator, or, most seriously, a stuck-open injector that is actively flooding the cylinder with raw fuel and fouling the spark plug in the process.15
Crank, No-Start: Ignition & Sensor Synchronization
Fuel and compression can both be perfect and the engine will still refuse to start if there is no spark, or if the spark and the fuel injectors are firing at the wrong instant in the engine's rotation.
Ignition Coil Failure
Each cylinder's coil-on-plug ignition coil is a step-up transformer: a primary winding of a few hundred turns of heavy copper wire receives 12 volts from the battery, wrapped around a secondary winding of tens of thousands of turns of hair-thin wire. When the computer suddenly cuts the primary circuit's ground, the collapsing magnetic field induces a voltage spike that can exceed 60,000 volts across the secondary winding — enough to jump the spark plug's gap and ignite the mixture.16Mounted directly on a hot cylinder head, these coils endure constant heat cycling that expands and contracts the internal windings until the insulation degrades and a wire separates, creating an open circuit. A healthy primary winding measures roughly 0.4 to 2.0 ohms; a healthy secondary winding measures roughly 6,000 to 10,000 ohms. A reading of “OL” (open limit, or infinite resistance) on either winding means the coil is dead.16 Because heat is the failure mechanism, a coil can pass every test cold and only fail once the engine reaches full operating temperature — which is why some cars start fine in the morning and refuse to restart after a hot afternoon errand.
Crankshaft Position Sensor Failure
The engine computer only knows the crankshaft's exact position and speed through the Crankshaft Position Sensor (CKP), which reads a toothed “reluctor wheel” spinning with the crankshaft — typically a wheel with one deliberately missing tooth so the computer can locate top dead center on every rotation.17If the CKP sensor fails — from age, heat damage, or metallic debris blinding its magnetic pickup — the computer loses all visibility into the engine's rotation. As a built-in safety precaution, if no valid, synchronized CKP signal arrives during cranking, the computer disables the fuel pump relay and grounds out the ignition coils entirely, producing a continuous crank-no-start with the engine spinning normally the whole time.17
Key finding: A crank-no-start with the engine spinning at a completely normal speed, no unusual noise, and no fuel smell at the tailpipe is one of the most common signatures of a failed Crankshaft Position Sensor — the engine is mechanically fine, but the computer has no idea where the pistons are.
Crank, No-Start: The Digital Immobilizer Lockout
Even with a fully charged battery, perfect compression, correct fuel pressure, and healthy sensors, the car will refuse to start if it fails its own internal security check. Federal Motor Vehicle Safety Standard No. 114 requires that an electronic engine control system lock out engine operation if someone attempts to start the vehicle without a verified, factory-coded key.4 This rule is why hot-wiring a modern car is effectively impossible.
When you turn the key or press the start button, a transponder chip inside the key transmits a code to a receiver ring around the ignition. That triggers a “seed-key” challenge-response handshake between the body control module and the powertrain control module: the body module sends a random mathematical “seed,” the powertrain module runs it through a cryptographic algorithm to compute a matching “key,” and only if the two modules agree does the powertrain module get authorization to activate the fuel injectors and the starter relay.18 If the body module can't read the key fob — a dead fob battery, a damaged transponder coil, or aftermarket interference — or if the data link between the two modules is corrupted, the handshake fails instantly and the computer withholds both fuel and spark.3
This is also the one crank-no-start cause that can occasionally produce a no-crank symptom instead: if the module denial happens early enough in the sequence, the computer never closes the starter relay at all, and the engine never turns over.3
When a Replaced Module Won't Recognize the Car
If a body or powertrain control module has recently been replaced, the new module carries different security codes and will keep failing the seed-key handshake until a technician runs a manufacturer security relearn procedure with a scan tool, typically requiring dealer-level security credentials.3In less severe cases — after a deep battery drain, or a brief electrical glitch — the modules simply lose sync with the key fob rather than losing their stored codes entirely. Manufacturer procedures for these lighter resets typically involve cycling the ignition to the “on” position for a fixed interval, off, and repeating that sequence several times to force the transponder parameters to resynchronize without a scan tool.20
Reading the Trouble Codes: What the Scanner Tells You
Throughout a crank-no-start diagnosis, the fastest way to narrow the search is to plug an OBD-II scanner into the Data Link Connector under the dashboard. When any of the systems above detects an anomaly, its control module stores a snapshot of the failure as a Diagnostic Trouble Code (DTC).19
“P” codes (Powertrain) point to the engine itself — codes in the P0100 range flag fuel and air metering problems, and a code like P0335 specifically identifies a Crankshaft Position Sensor circuit fault, sending the diagnosis directly to the sensor rather than the fuel or compression systems.19
“U” codes (network communication)are the most important in a modern no-start diagnosis, because they mean the vehicle's modules have lost the ability to talk to each other over the CAN bus entirely. A code like U0100 (lost communication with the ECM/PCM) or U0140 (lost communication with the body control module) tells you the starting failure isn't mechanical at all — the modules are physically unable to complete the immobilizer handshake or issue the starter command, almost always because of an electrical short, a blown fuse, or excessive resistance somewhere on the CAN bus wiring.19
Aftermarket add-ons plugged into the same connector — remote-start kits, aftermarket stereos, or insurance-tracking dongles — are a common, easily overlooked source of corrupted CAN bus data or an added parasitic load. Disconnecting them is a reasonable first step before deeper diagnosis if one was installed shortly before the no-start began.
Quick Diagnostic Reference: Why Won't My Car Start?
Match what you observed when you turned the key to the row below to identify the most likely pillar and cause before diagnosing further.
| What You Observe | Pillar | Most Likely Cause | Mechanism |
|---|---|---|---|
| Total silence — no lights, no sound | Electrical | Fully dead/disconnected battery, blown main fuse | No current reaches any control module |
| Rapid clicking (chatter) | Electrical | Weak/depleted battery or corroded terminals | Solenoid engages, voltage collapses under starter load, releases |
| Single click, then silence | Electrical | Burnt solenoid contacts, worn brushes, or seized engine | Solenoid engages but current can't reach the motor, or engine won't turn |
| Cranks fine, security/key light flashes | Digital authorization | Immobilizer handshake failure | BCM/PCM won't authorize fuel and spark without a verified key |
| Cranks fine, no smell, engine feels normal | Ignition/sensors | Failed Crankshaft Position Sensor or dead ignition coil | No synchronized signal or no spark — computer withholds fuel/spark |
| Cranks fine, strong gasoline smell | Fuel | Flooded engine or stuck-open fuel injector | Excess raw fuel displaces oxygen and fouls the spark plug |
| Cranks fine, no fuel smell, no fuel pump whir | Fuel | Failed fuel pump, relay, or clogged filter | No pressurized fuel reaches the injectors |
| Cranks unusually long, oil in coolant or vice versa | Compression | Blown head gasket or worn rings/valves | Cylinder pressure escapes before it can support combustion |
| Won't crank at all, but battery tests fine | Electrical / digital authorization | Failed starter relay, neutral safety switch, or PCM/BCM denial | Control circuit never closes to send power to the starter |
What to Do Right Now
Before calling for a tow, run through this sequence in order. Each step is designed to eliminate an entire pillar of the framework above without any special tools.
- Check the dashboard.Do the interior lights, radio, and dash gauges come on when you turn the key to the “on” position? If nothing lights up at all, suspect the battery, a disconnected cable, or a main fuse before anything else.
- Listen for a click. A rapid chatter or single clunk points to the electrical pillar — see our dedicated clicking guide for the next step. Total silence with lights on suggests the control circuit — relay, neutral safety switch, or immobilizer denial — never sent power to the starter at all.
- Watch the dashboard for a security or key-shaped warning light. A flashing immobilizer light while the engine cranks (or refuses to crank) points at the digital authorization pillar — try a spare key, replace the key fob battery, and rule out aftermarket accessories plugged into the diagnostic port.
- If the engine cranks normally, smell the tailpipe and listen for the fuel pump.A strong raw-gasoline smell suggests flooding or a stuck injector. Silence where you'd expect a brief pump whir when the key first goes to “on” suggests the fuel pump or its relay has failed.
- Note how the engine feels while cranking. A completely normal-feeling crank with no fuel smell and no misfire points toward the ignition and sensor systems. An engine that cranks unusually long, or that recently ran hot or overheated, raises the possibility of a compression or head-gasket failure.
Do not keep cranking a seized or hydro-locked engine. If the starter engages (a click or a hum) but the engine will not physically turn — especially after an oil pressure warning, a loud knock, or evidence of coolant in the oil — every additional crank attempt converts electrical energy directly into heat with nowhere to go. Sustained cranking against a locked engine can overheat battery cables, melt starter windings, and start an engine-compartment fire.12
Frequently Asked Questions
My car won't start, but the radio and dashboard lights work fine. What's wrong?
Accessories only need a small trickle of current, so they can run for a while on a battery that no longer has the reserve capacity to sustain the hundreds of amps the starter demands. This points at the battery or its connections rather than a totally dead electrical system — but a proper load test, not just a voltage reading, is the only way to confirm it.
My car cranks fine but just won't catch. What are the most common causes?
In rough order of frequency: a failed fuel pump or clogged filter, a dead ignition coil or failed crankshaft position sensor, a stuck-open fuel injector flooding the engine, and an immobilizer handshake failure after a key, battery, or module problem. A compression or timing failure is less common but far more serious when it does occur.
Why did my car start yesterday and not today?
Intermittent no-starts are the signature of a component operating right at the edge of its specification: a battery that's borderline on cold cranking amps and fails only on a cold morning, a parasitic draw that only fully drains the battery after a longer-than-usual parked stretch, or a heat-cycled ignition coil that fails only once fully warmed up. A load test, a parasitic draw test, or a coil resistance test — matched to when the failure happens — will confirm which.
The security or key-shaped light is flashing and the car won't start. What does that mean?
That is the immobilizer telling you it did not receive a verified handshake from your key. Try a second key if you have one, replace the key fob's battery, and remove any aftermarket device plugged into the diagnostic port near the steering column, since some of these can interfere with the same data bus the handshake uses. If a body or powertrain control module was recently replaced, the car needs a manufacturer security relearn procedure before it will recognize any key at all.
Is it safe to keep trying to start a car that won't start?
It depends entirely on what you observed. Repeated attempts on a car that just clicks from a weak battery are mostly harmless — you're simply cycling the battery. Repeated attempts on a car that cranks unusually hard, sounds mechanically wrong, or that recently overheated risk turning a recoverable problem into an expensive one. If you've tried two or three times with no change, stop and diagnose rather than keep cranking.
How much does it typically cost to fix a no-start?
Costs vary widely by root cause. A battery replacement typically runs $100–$250. A starter replacement runs $250–$600. A fuel pump replacement is commonly $400–$1,000 depending on tank access. A single ignition coil is $50–$200 installed; a crankshaft position sensor is usually $150–$400 installed. Immobilizer and module diagnosis — including a security relearn procedure — can range from $150 to well over $500 depending on the manufacturer and whether dealer-level security access is required.