P0CBDDrive Motor A Coolant Temperature Sensor Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P0CBD reports that the coolant temperature sensor of drive motor A gives a believable voltage but an implausible temperature. GM uses it on the 2013 eAssist models, where the drive motor is the belt-driven motor generator with its own small cooling loop. Table 13OBDG05C runs the check once per key cycle after an engine-off period of more than 21,600 s: the loop sensor is compared with the mean of stator temperature, intake air temperature and transmission fluid temperature, and a difference above 25 °C in 50 of 62 samples at 100 ms is a Type B fault. The test is skipped while stator sensor codes P0A2B–P0A2D, intake air or transmission fluid sensor codes, the sensor's own P0CBE/P0CBF or CAN faults U0100/U0101 are active. A drifting sensor is the likely cause; the motor generator may be limited meanwhile.
- What you may notice
- Check-engine lamp after the second faulty trip
- Reduced electric assist or regeneration
- Likely causes
- LikelyCoolant temperature sensor drifted out of its curve
- PossibleAdded resistance from a corroded connector
- RareOne of the comparison sensors (stator, intake air, transmission oil) reading wrongly
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.