P0018Crankshaft Position - Camshaft Position Correlation (Bank 2 Sensor A)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- The engine control module checks whether the signal of the intake camshaft on bank 2 (sensor A) arrives at the expected crankshaft position, usually while the camshaft phaser is in its rest position. P0018 is set when the deviation stays outside a calibrated window. The camshaft is then out of step with the crankshaft: a timing belt or chain has jumped a tooth, the chain is stretched, the phaser is stuck at an end stop, or a reluctor wheel has slipped. On engines with a single camshaft, sensor A is simply the only camshaft sensor. Bank 2 exists only on V and boxer engines.
- What you may notice
- Check engine light on
- Long cranking or hard starting
- Rough idle and loss of power
- Chain rattle at cold start on chain-driven engines
- Risk of valve damage on interference engines if the timing has jumped
- Likely causes
- LikelyTiming chain stretched, or belt or chain jumped a tooth
- PossibleCamshaft phaser stuck at an end stop, oil control valve or oil pressure faulty
- PossibleIncorrect assembly after a belt or chain replacement
- RareCamshaft or crankshaft sensor signal disturbed
- RareReluctor wheel on crankshaft or camshaft slipped
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €60 – €4,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.