P0341Powertrain
Powertrain · SAE
CMP Sensor — Range/Performance
Meaning
The engine control module has detected that the camshaft position (CMP) sensor signal exhibits frequency, pattern, or phase-offset values outside calibrated limits relative to the CKP signal. The signal is present but does not match the expected crankshaft-to-camshaft relationship.
Common causes
- Damaged, mispositioned, or defective camshaft reluctor wheel
- Faulty CMP sensor or incorrect air gap
- CMP sensor wiring with abnormal resistance or corroded connector
- Slack or jumped timing chain or belt (one or more teeth)
- Stuck VVT actuator altering the detected camshaft position
- Electromagnetic interference on the CMP sensor circuit
Symptoms
- Check-engine light (MIL) illuminated
- Hard or slow cranking start
- Rough idle and engine instability
- Reduced power and efficiency loss
- Possible increase in fuel consumption
Severity
High: a non-correlating CMP signal compromises sequential injection and ignition synchronization, causing performance loss and possible engine damage.
What to do
- Compare CMP and CKP signals in real time to verify phase correlation
- Inspect the camshaft reluctor wheel for missing, deformed, or dirty teeth
- Check timing chain or belt condition and tension for jumped teeth
- Measure the CMP sensor air gap and verify wiring continuity
- Replace the CMP sensor if wiring and timing drive are in good condition