Car won't start: Codes, Causes & Fixes

P0335 Powertrain The engine computer lost the crankshaft position signal. Expect stalling or a crank-no-start. High P0340 Powertrain The computer lost the camshaft signal on bank 1. Expect long cranking, less power… Moderate P0562 Powertrain The engine computer sees too little supply voltage – usually a charging, battery or ground… Moderate P0606 Powertrain The engine computer failed its own internal self-test – check its power and grounds before… Moderate U0073 Network A module saw so many errors on CAN bus A that it shut off its own transmitter. High U0100 Network Another module stopped hearing from the engine computer on the CAN network. High

P0001 Powertrain The PCM can't drive the solenoid that meters fuel into the high-pressure pump. Often a no-start… High P0016 Powertrain The bank 1 intake cam and the crankshaft are out of step, most often from a stretched or jumped… High P0087 Powertrain Measured fuel pressure has dropped well below what the engine computer is asking for. High P0090 Powertrain The engine computer sees an electrical fault in the wiring or coil of the fuel pressure control… Moderate P0093 Powertrain Rail pressure is dropping faster than injection explains: fuel may be escaping. Stop and check… Critical P0123 Powertrain The throttle position signal is stuck near 5 volts, so the PCM sees wide open throttle even… Moderate P0190 Powertrain The signal from the fuel rail pressure sensor has dropped out or become unusable to the engine… Moderate P0191 Powertrain The rail pressure reading is electrically valid but doesn't make sense for how the engine… Moderate P0192 Powertrain The rail pressure sensor signal voltage has fallen below the lowest value a working sensor can… Moderate P0193 Powertrain The rail pressure sensor signal is stuck near the 5-volt limit, above anything a working sensor… Moderate P0200 Powertrain The ECU found a fault in the injector control circuits that it can't pin on one cylinder, often… High P0216 Powertrain The ECU can't control or confirm injection timing, usually on a diesel with an electronic… High P0230 Powertrain The engine computer found a fault in the circuit it uses to switch the fuel pump relay or pump… Moderate P0231 Powertrain Voltage on the wire feeding the fuel pump is too low while the pump is supposed to be running. High P0232 Powertrain The fuel pump feed wire has voltage on it when the engine computer has switched the pump off. Moderate P0320 Powertrain The computer lost the engine speed (rpm) signal. The engine can stall suddenly or refuse… High P0335 Powertrain The engine computer lost the crankshaft position signal. Expect stalling or a crank-no-start. High P0337 Powertrain The crank sensor signal line is stuck near 0 volts, usually a wire shorted to ground. Often… High P0338 Powertrain The crank signal line sits at 5 or 12 volts and stops switching: open ground, open wire… High P0339 Powertrain The crank signal drops out for moments at a time. Classic sign: stalls when hot, restarts once… High P0340 Powertrain The computer lost the camshaft signal on bank 1. Expect long cranking, less power… Moderate P0342 Powertrain The bank 1 cam sensor signal stays near 0 volts. Often a weak battery, a pinched wire… Moderate P0343 Powertrain The bank 1 cam signal is stuck high: an unlatched connector, broken ground or open wire after… Moderate P0344 Powertrain The bank 1 cam sensor signal keeps dropping out for short moments, which can cause random… Moderate P0350 Powertrain The shared coil feed, ignition module or coil wiring is faulty. Often set with several… Moderate P0504 Powertrain The two contacts in the brake pedal switch disagree on whether you're braking; check the pedal… Moderate P0560 Powertrain The engine computer saw its supply voltage missing or out of range – check fuses and feeds… Moderate P0562 Powertrain The engine computer sees too little supply voltage – usually a charging, battery or ground… Moderate P0572 Powertrain The PCM never sees the brake pedal pressed – brake lights may be out and the car may not shift… Moderate P0573 Powertrain The PCM thinks the brake pedal is always pressed – brake lights stay on, often from a missing… Moderate