OBD-II code · Powertrain (generic)
P0C18 Drive Motor B Position Sensor Not Learned
The hybrid control module has not learned the rotor position offset for drive motor B. Phase commutation cannot be optimised until learning completes.
Is it safe to drive with P0C18?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyAdaptation lost after battery disconnect
- PossibleSensor replaced without learn procedure
Symptoms
- EV/hybrid system warning light on
- Reduced motor power or torque
- Possible limp mode or vehicle shutdown
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.3–1.5 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Drive Motor B Position Sensor, Hybrid Control Module
Related codes
- P0C17Drive Motor A Position Sensor Not Learned
- P0C15Drive Motor B Inverter Phase V Over Temperature
- P0C16Drive Motor B Inverter Phase W Over Temperature
- P0C19Drive Motor A Torque Delivered Performance
- P0C1ADrive Motor B Torque Delivered Performance
- P0C1BElectric/Auxiliary Transmission Fluid Pump Control Module Internal Temperature Too High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.