P0377 Fault Code

Timing Reference High Resolution Signal B Too Few Pulses

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0377 fault code indicates a problem with the timing reference high resolution signal B, specifically that there are too few pulses detected by the engine control unit (ECU). This signal is crucial for ensuring accurate timing for ignition and fuel injection, thus impacting overall engine performance.

What are the symptoms of the P0377 code?

Symptoms commonly associated with the P0377 fault code may include:

• Engine misfires or rough running
• Difficulty starting the engine
• Decreased engine performance or power loss
• Check Engine Light activated on the dashboard.

What causes the P0377 code?

Common causes for a P0377 code include:

• Faulty crankshaft or camshaft position sensors
• Damaged wiring or connectors related to the timing reference signals
• Timing belt or chain issues that affect signal generation
• ECU software issues that misinterpret the sensor signals.

How to fix P0377?

To resolve a P0377 code, you can take the following steps:

• Inspect and test the crankshaft and camshaft position sensors for proper function.
• Check the wiring and connectors for any signs of damage or corrosion; repair or replace as necessary.
• Evaluate and replace the timing belt or chain if it's found to be worn or misaligned.
• If all hardware appears functional, consider updating or reprogramming the ECU to ensure proper signal interpretation.