OBD-II code · Powertrain (generic, extended)
P277D Electric/Auxiliary Transmission Fluid Pump B Motor Over Temperature
The second auxiliary transmission fluid pump motor has reached over-temperature. Sustained high duty or insufficient cooling.
Is it safe to drive with P277D?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySustained high duty cycle
- PossibleCooling air or fluid path blocked
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, Pump Motor
Related codes
- P0DE4Electric/Auxiliary Transmission Fluid Pump A Motor Over Temperature
- P277AElectric/Auxiliary Transmission Fluid Pump B Hydraulic Leakage
- P277BElectric/Auxiliary Transmission Fluid Pump B Driver Circuit Performance
- P277CElectric/Auxiliary Transmission Fluid Pump B Motor Stalled
- P277EClutch A Unexpected Mechanical Gear Disengagement
- P277FClutch B Unexpected Mechanical Gear Disengagement
- P2780Downshift Switch Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.