Detailed Description of Error P0373

OBDII error code P0373 indicates that the Engine Control Module (ECM) has detected an issue with the high-resolution timing reference signal A, which is used to synchronize engine timing events. The signal is generated by the crankshaft position sensor and is used to determine when to fire the fuel injectors and spark plugs. The ''intermittent/erratic pulses'' part of the code description suggests that the signal is not consistent or reliable, which can cause problems with engine performance and emissions.

The high-resolution timing reference signal is typically a digital signal that is sent to the ECM at a high frequency, usually in the range of 10-20 kHz. The signal is used to determine the crankshaft position and engine speed, which is essential for proper engine operation. If the signal is intermittent or erratic, the ECM may not be able to accurately determine engine timing, leading to problems such as misfires, poor engine performance, and decreased fuel efficiency.

Possible Causes of Error P0373

• Faulty crankshaft position sensor: The crankshaft position sensor may be malfunctioning, causing the high-resolution timing reference signal to be intermittent or erratic.
• Wiring or connector issues: Problems with the wiring or connectors between the crankshaft position sensor and the ECM can cause the signal to be disrupted or lost.
• ECM malfunction: In some cases, the ECM itself may be malfunctioning, causing it to misinterpret the timing reference signal.
• Crankshaft position sensor circuit issues: Issues with the circuit that powers the crankshaft position sensor, such as a faulty voltage regulator or low battery voltage, can cause the signal to be intermittent or erratic.
• Engine mechanical issues: In some cases, engine mechanical issues such as low oil pressure, worn engine bearings, or a faulty timing belt can cause the crankshaft position sensor to malfunction.

Possible Fixes for Error P0373

• Inspect and repair wiring and connectors: Check the wiring and connectors between the crankshaft position sensor and the ECM for any signs of damage or corrosion. Repair or replace as necessary.
• Replace crankshaft position sensor: If the crankshaft position sensor is faulty, replace it with a new one.
• Check ECM for software updates: If the ECM is malfunctioning, check for software updates and reflash the ECM as necessary.
• Check crankshaft position sensor circuit: Verify that the circuit that powers the crankshaft position sensor is functioning properly, and repair or replace any faulty components.
• Perform engine mechanical repairs: If engine mechanical issues are suspected, perform any necessary repairs, such as replacing the timing belt or repairing engine bearings.