DTC Code P0373 – What does this code mean for Volkswagen?

<ul> <li><b>Engine Light ON</b>: The Engine Light or Service Engine Soon Warning Light illuminates, indicating an issue with the timing reference high resolution signal. This can be caused by intermittent or erratic pulses from the crankshaft position sensor.</li> <li><b>Engine Misfire</b>: The engine may misfire due to incorrect timing signals, leading to poor combustion. This can be linked to a faulty crankshaft position sensor or wiring issues.</li> <li><b>Poor Engine Performance</b>: The vehicle may experience reduced power and acceleration. This is often due to the engine control unit receiving incorrect timing information, affecting fuel injection and ignition timing.</li> <li><b>Hard Starting or No Start</b>: The engine may be difficult to start or may not start at all. This can be caused by the engine control unit not receiving a consistent signal from the crankshaft position sensor.</li> <li><b>Stalling</b>: The engine may stall unexpectedly, especially at low speeds or idle. This can be due to erratic timing signals disrupting the engine's operation.</li> </ul>

<ul><li>The Timing Reference Optical Sensor harness may be open or shorted, leading to intermittent or erratic pulses.</li><li>Poor electrical connection in the Timing Reference Optical Sensor circuit can cause signal disruptions.</li><li>A faulty Timing Reference Optical Sensor can result in inaccurate timing signals.</li><li>A damaged Powertrain Control Module (PCM) can affect the timing reference signal processing.</li></ul>

<ul> <li><b>Initial Scan</b>: Use an OBD-II scanner to confirm the presence of DTC P0373 and check for any additional codes that may be related.</li> <li><b>Visual Inspection</b>: Inspect the wiring and connectors related to the crankshaft position sensor for any signs of damage, corrosion, or loose connections.</li> <li><b>Check Crankshaft Position Sensor</b>: Test the crankshaft position sensor using a multimeter to ensure it is within the manufacturer's specified range. Replace if faulty.</li> <li><b>Inspect Timing Components</b>: Examine the timing belt or chain for wear, misalignment, or damage that could cause erratic pulses.</li> <li><b>Check Engine Control Module (ECM)</b>: Verify the ECM is functioning correctly by checking for any software updates or faults. Reprogram or replace if necessary.</li> <li><b>Test Vehicle</b>: After performing repairs, clear the codes and test drive the vehicle to ensure the issue is resolved and the DTC does not reappear.</li></ul>

<p>The DTC code P0373 for Volkswagen indicates an issue with the Timing Reference High Resolution Signal 'A' being intermittent or erratic. This is a <b>critical</b> issue as it can lead to severe engine performance problems, including misfires, stalling, and potential engine damage.</p><ul><li>Immediate action is required to diagnose and repair the timing reference sensor or related wiring.</li><li>Delaying repair can result in further engine damage and unsafe driving conditions.</li></ul>