P0378 - OBD II Trouble Code

Our automotive experts have put together the following information about the P0378 diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P0378 code.

OBD II Fault Code

• OBD II P0378

OBD-II Code Decreased engine performance is defined as a Timing Reference High Resolution Signal "B" Intermittent/Erratic

The engine control module (PCM) sends a duplicate signal of the crankshaft position sensor (CKP) to the Fuel Injection Control Module (FICM). If the signal to the FICM becomes corrupt, the PCM will set code P0378.

Decreased engine performance Symptoms

• Decreased engine performance
• Engine may not start

Common Problems That Trigger the P0378 Code

• Crankshaft Position Sensor (CKP) failure
• Fuel injection control module (FICM) failure
• Powertrain Control Module (PCM) failure
• Wiring issue