P0373 – Timing Reference High Resolution Signal A Intermittent/Erratic Pulses

Definition: The P0373 code indicates that the Engine Control Module (ECM) has detected an intermittent or erratic signal from the high-resolution timing reference sensor, which is often related to the crankshaft position sensor or camshaft position sensor.

p0373 – Timing Reference High Resolution Signal A Intermittent Erratic Pulses

Severity: Moderate

Common Causes

P0373 – Timing Reference High Resolution Signal A Intermittent/Erratic Pulses

• Wiring issues (e.g., damaged wiring, loose connections)
• Faulty crankshaft position sensor
• Engine timing issues
• ECU software glitches or malfunctions

Common Misdiagnosis

OBD2 Code: P0373

Description: Timing Reference High Resolution Signal A Intermittent/Erratic Pulses

Common Misdiagnosis: Faulty crankshaft position sensor or camshaft position sensor is often misdiagnosed, while the actual issue may be related to wiring problems or connector issues.

Common Diagnostic Steps

OBD2 Code: P0373

Description: Timing Reference High Resolution Signal A Intermittent Erratic Pulses

Common Diagnostic Steps:

• Check for any additional trouble codes and address them first.
• Inspect the wiring and connectors related to the timing reference sensor for damage or corrosion.
• Test the timing reference sensor using a multimeter to ensure it is functioning correctly.
• Verify that the engine’s mechanical timing is correct.
• Examine the reluctor wheel for damage or misalignment.
• If applicable, update or reflash the vehicle’s Powertrain Control Module (PCM) with the latest software version.
• If all else fails, replace the timing reference sensor with a new one and retest.