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Car won't start: Codes, Causes & Fixes

First tell the two cases apart: if the engine does not crank at all, the battery, battery terminals, starter or a security/immobilizer lockout are the usual suspects; if it cranks but won't fire, look at fuel delivery, crankshaft position sensor and ignition. Codes such as P0335 (crankshaft sensor) or immobilizer messages narrow it down, but a no-crank fault may leave no code at all. Check battery voltage and terminal connections before anything else.

123Codes
3.2Average severity
28%High or critical
21%DIY-friendly
Severity distributionSeverity distribution

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P0093 Powertrain Rail pressure is dropping faster than injection explains: fuel may be escaping. Stop and check… Critical P0216 Powertrain The ECU can't control or confirm injection timing, usually on a diesel with an electronic… High P0001 Powertrain The PCM can't drive the solenoid that meters fuel into the high-pressure pump. Often a no-start… High P0192 Powertrain The rail pressure sensor signal voltage has fallen below the lowest value a working sensor can… Moderate P0090 Powertrain The engine computer sees an electrical fault in the wiring or coil of the fuel pressure control… Moderate P0190 Powertrain The signal from the fuel rail pressure sensor has dropped out or become unusable to the engine… Moderate

All codes (123)

All Severity 3+ Severity 4+
U1000 Nissan · Network A Nissan control module couldn't send or receive CAN messages for about 2 seconds or longer. Moderate U1064 Chevrolet · Network Other modules stopped hearing the body control module on an older GM's Class 2 data line. Moderate U3003 Network A control module saw its supply voltage drop too low or rise too high, usually a battery… Low

Symptoms

Check engine light on 558Loss of power 214Rough idle 184Limp mode 165Poor fuel economy 146Engine stalling 133Harsh or slipping shifts 80ABS / traction light on 65Fuel smell 34Check engine light flashing 22