Ignition/Distributor Engine Speed Input Circuit Intermittent
Your engine's crankshaft position sensor is sending an unreliable signal to the computer, like a radio that keeps cutting in and out. The ECU can't consistently read engine speed, which throws off ignition timing and fuel injection.
The ECU monitors the crankshaft position (CKP) sensor signal for consistent pulse patterns that indicate engine RPM and timing. When the signal drops out intermittently or becomes erratic, the ECU cannot reliably calculate ignition advance and fuel injection duration. A healthy signal should maintain steady frequency within expected RPM ranges.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| CKP Signal Frequency | Stable pulses matching RPM | Intermittent dropouts or erratic pulses |
| Signal Voltage | 0.2-5V oscillation | Voltage spikes or complete signal loss |
Code P0325 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, P0325 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.