P0CBEDrive Motor A Coolant Temperature Sensor Circuit Low
- 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
- P0CBE says the coolant temperature input of drive motor A is below its valid range, meaning the sensor resistance has become very small. GM's 2013 eAssist table 13OBDG05C sets the code when the raw reading is under 100.9 Ω, which equals 120 °C, in 50 of 62 samples taken every 100 ms with the vehicle in run/crank; it is a Type B fault, so the lamp comes on after the second trip. Such a low value is usually a shorted sensor or a signal line rubbing through to ground. GM's preliminary information PIC5720A for 2012–2013 LaCrosse and Regal, 2013 Malibu Eco and 2014 Impala Eco with eAssist describes exactly that: a misrouted harness touching the crank, A/C compressor pulley or belt, together with C027B and C0040 and a humming noise. Its partner for an open circuit is P0CBF.
- What you may notice
- Check-engine lamp, possibly with ABS or brake assist warning
- Hum or buzz from the right front
- Electric assist restricted
- Likely causes
- LikelyHarness rubbing on crank or compressor pulley or belt (GM PIC5720A)
- PossibleCoolant temperature sensor shorted internally
- RareLoop genuinely very hot, e.g. pump or coolant fault
- 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: €60 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.