P0378

DTC P0378, sometimes indicated as P037800 is an OBD diagnostic trouble code indicating a generic fault with the vehicle powertrain (i.e. engine and gearbox). This code identifies an error with the ignition system causing timing reference high resolution signal b intermittent/erratic pulses.

This code is caused by an intermittent or erratic pulse from the high resolution timing reference signal B. This signal is responsible for providing accurate timing information to the engine control unit.
There are a few possible causes of this issue, including a bad sensor, wiring issue, or faulty engine control unit.
If the code is intermittent, first check the wiring and connectors for any signs of damage or corrosion. If the wiring is okay, then check the sensor for any signs of damage or contamination. If the sensor is okay, then the engine control unit may need to be replaced.

• P0378: Timing Reference High Resolution Signal B Intermittent/Erratic Pulses
• P0378: Timing Reference High Resolution Signal "B" Intermittent/Erratic Pulses
• P0378: Timing Reference High Resolution Signal B Erratic Pulses
• P0378: Timing reference, high resolution signal B – intermittent/erratic pulses
• P0378 00: Incorrect engine speed signal from sensor "B" - sporadic fault, uneven pulses
• P0378 00: Timing reference, high resolution signal B - intermittent/erratic pulses