Get the app
Quick access from your home screen.
Strange noises from under the bonnet? Spooky. Happy Halloween from Auto Veteran: may your only scares be costumes.
DTC codes / P03xx · Ignition system and misfire / P0378
P0378 means the engine control module (ECM) has detected intermittent or erratic pulses from the 'B' high-resolution timing reference signal, which is generated by the camshaft or crankshaft position sensor. The ECM uses this signal to precisely synchronize fuel injection and ignition timing, so erratic pulses can disrupt engine operation.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
Get the app
Quick access from your home screen.