P0379 Fault Code

Timing Reference High Resolution Signal B No Pulses

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

The P0379 fault code indicates an issue with the Timing Reference High Resolution Signal B, which is responsible for providing the engine control module (ECM) with accurate timing signals. When no pulses are detected from this signal, it can lead to problems in engine performance and timing-related issues.

• The timing reference is crucial for synchronization in engine operations.
• This fault code can affect ignition timing and fuel injection, leading to inefficient engine performance.
• Vehicles may experience stalling or difficulty starting due to the lack of communication from the timing reference signal.

What are the symptoms of the P0379 code?

Common symptoms associated with the P0379 fault code include:

• Engine misfires or rough idling.
• Difficulty starting the engine or failure to start.
• Loss of power during acceleration.
• Check engine light illuminated on the dashboard.

What causes the P0379 code?

Several factors can contribute to the P0379 fault code, including:

• A malfunctioning crankshaft or camshaft position sensor.
• Damaged wiring or connectors related to the timing reference signal.
• ECM software issues that could affect signal interpretation.
• Problems in the engine management system such as timing belt or chain problems.

How to fix P0379?

To resolve the P0379 fault code, the following steps may be taken:

• Inspect and test the crankshaft and camshaft position sensors for proper functionality.
• Check the wiring and connectors for any signs of damage, corrosion, or loose connections.
• Update or reprogram the ECM if necessary to ensure proper signal processing.
• If the timing belt or chain is found to be worn or damaged, it should be replaced to maintain proper engine timing.