P0366 indicates the Powertrain Control Module (PCM) has detected a problem with the camshaft position sensor B circuit signal for bank 1 (the bank containing cylinder #1). The signal is either out of expected range or the circuit is not performing as designed, which can affect engine timing and fuel injection timing.
The camshaft position sensor itself has failed due to wear, heat damage, or internal electrical failure, resulting in abnormal signal output.
Damaged, chafed, shorted, or corroded wiring and connectors between the sensor and PCM can cause intermittent or no signal.
A stretched timing chain, jumped timing, or worn timing components can cause incorrect cam position signals.
Oil, sludge, or debris on the sensor tip can interfere with magnetic or Hall-effect signal generation.
A failing crankshaft position sensor can cause cam sensor codes to appear due to shared signal reference issues.
The PCM itself may have failed, but this is uncommon and should only be considered after all other causes are ruled out.
No. While some may recommend PCM replacement, it is rarely the cause of P0366. The camshaft position sensor, wiring, or timing issues are the actual problem in the vast majority of cases. PCM failure should only be considered after all other possibilities are thoroughly investigated.
Driving is not recommended because the engine may run poorly, stall, or fail to start. If the engine runs at all, it should be driven short distances directly to a repair facility.
Yes. The camshaft position sensor tells the PCM when to fire the injectors and ignition. If the signal is missing or incorrect, the PCM may disable fuel injection or ignition, preventing the engine from starting.
The Check Engine Light may turn off temporarily, but the code will return once the PCM re-evaluates the sensor circuit. The underlying problem will remain until repairs are made.