P276BElectric/Auxiliary Transmission Fluid Pump B Motor Supply Voltage Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Can trigger limp mode
- How the car detects it
- P276B is set when the supply voltage reaching the motor of auxiliary transmission pump B sags below its lower limit. Audi names this code in bulletin 34-17-25 (revision of September 2017) covering 2017 A4/A5/A6 models and the 2018 Q5 fitted with the 0CJ, 0CK or 0CL twin-clutch gearbox. Pump B there is the gear oil pump V553, and P276B00 may appear together with lost communication U28A00, stuck-on P27A600 and performance P27A300. The bulletin attributes a rattle from under the car to a supplier assembly issue and calls for a new pump with new bolts; transmission fluid must not reach the electrical connector during removal. Apart from that case, weak batteries, high-resistance grounds and partial shorts can pull the voltage down.
- What you may notice
- Rattle noise from under the vehicle (Audi)
- Transmission warning lamp
- Further pump B codes stored
- Likely causes
- LikelyDefective gear oil pump V553 (Audi 0CJ/0CK/0CL)
- PossibleHigh resistance in supply or ground of the pump
- RareLow system voltage from a weak battery
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.