Timing Reference High Resolution Signal A Too Many Pulses
Your engine's timing sensor is sending too many signal pulses to the computer, like a clock ticking twice as fast as it should. The ECU can't keep up with the rapid signals and flags this as an error.
The ECU monitors the crankshaft position sensor (CKP) or camshaft position sensor (CMP) signal frequency during engine operation. It expects a specific pulse rate based on RPM; too many pulses indicate either a faulty sensor, wiring issue, or internal engine problem like a jumped timing chain.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| CKP/CMP Pulse Frequency | Proportional to RPM (e.g., 60-120 pulses/sec at idle) | Exceeds expected range by >15% or rapid signal noise detected |
| Signal Consistency | Uniform pulse intervals with <2% variance | Irregular intervals or multiple false pulses per cycle |
Code P0372 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P0372 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.