P0373 Fault Code

Timing Reference High Resolution Signal A Intermittent/Erratic Pulses

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

The P0373 fault code indicates an issue with the Timing Reference High Resolution Signal A. This code typically arises when the engine control module (ECM) detects intermittent or erratic pulses in the high-resolution timing signal generated by the crankshaft or camshaft sensors. These sensors play a crucial role in engine timing, ensuring that fuel injection and ignition occur at the correct moment.

What are the symptoms of the P0373 code?

Symptoms associated with the P0373 fault code may include:

• Check Engine Light illuminated on the dashboard
• Engine misfires or stalling during operation
• Poor engine performance or rough idle
• Difficulty starting the engine
• Reduced fuel efficiency due to incorrect timing

What causes the P0373 code?

Common causes for the P0373 fault code include:

• Faulty crankshaft position sensor or camshaft position sensor
• Damaged or frayed wiring and connectors related to the timing sensors
• Poor electrical connection or corrosion in the sensor connectors
• Timing belt or chain issues causing incorrect sensor readings
• PCM (Powertrain Control Module) malfunction

How to fix P0373?

To address the P0373 fault code, a technician should:

• Inspect and test the crankshaft and camshaft position sensors for proper function
• Check the wiring and connectors for damage or corrosion, repairing or replacing as necessary
• Ensure that the timing belt or chain is properly aligned and in good condition
• If no mechanical issues are found, consider reprogramming or replacing the PCM if it is determined to be faulty.