OBD-II code · Powertrain (generic, extended)
P276C Electric/Auxiliary Transmission Fluid Pump B Motor Supply Voltage Circuit High
The motor supply voltage of the second auxiliary transmission fluid pump is above the operating range.
Is it safe to drive with P276C?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyAlternator regulator failed to limit output
- Less likelyWiring shorted to a higher-voltage circuit
- Less likelyConnector pins corroded - high contact resistance
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–3.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Aux Trans Pump B, Supply Circuit, Charging System
Related codes
- P0B0BElectric/Auxiliary Transmission Fluid Pump A Motor Supply Voltage Circuit High
- P2769Torque Converter Clutch Solenoid Circuit Low
- P276AElectric/Auxiliary Transmission Fluid Pump B Motor Supply Voltage Circuit / Open
- P276BElectric/Auxiliary Transmission Fluid Pump B Motor Supply Voltage Circuit Low
- P276DElectric/Auxiliary Transmission Fluid Pump B Motor Current
- P276EElectric/Auxiliary Transmission Fluid Pump B Motor Current Low
- P276FElectric/Auxiliary Transmission Fluid Pump B Motor Current High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.