Crankshaft Position Camshaft Position Correlation Bank 2 Sensor A
The engine computer detected that the camshaft and crankshaft timing on Bank 2 are out of sync, like two dancers falling out of step. This typically means a timing belt issue, faulty cam sensor, or variable valve timing malfunction.
The ECM monitors the phase correlation between crankshaft position (CKP) and camshaft position (CMP) sensors on Bank 2. It calculates the timing offset and compares it against calibrated thresholds. When the correlation drifts beyond acceptable limits, the fault is triggered.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Cam-to-Crank Phase Offset | ±5° crankshaft degrees | >10° deviation for >2 seconds |
| VVT Solenoid Response Time | <500 milliseconds | >1000 milliseconds or no response |
Code P0018 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, P0018 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.