P27A6Electric/Auxiliary Transmission Fluid Pump B Stuck On
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- How the car detects it
- P27A6 reports that auxiliary pump B keeps running, or keeps drawing current, while the controller has it switched off. Audi lists P27A600 in bulletin 34-17-25 for 2017 A4, A5 and A6 and 2018 Q5 models with 0CJ, 0CK and 0CL dual-clutch gearboxes; there the code may appear together with a rattle from the gear oil pump V553, which Audi traced to an assembly fault at the supplier and cures with a new pump. More generally, a pump that will not stop points to its own control electronics, a driver or relay that remains closed, or a control wire shorted to voltage, the case covered by P27A5. On pump A the same fault is P27A1. Apart from noise, a pump that never rests drains the 12 V battery and wears out early.
- What you may notice
- Pump noise or rattle from the gearbox area with the engine off
- Weak or flat 12 V battery
- Transmission warning stored
- Likely causes
- LikelyPump B module or electronics defective (e.g. Audi V553 supplier fault)
- PossibleDriver output or relay remains closed
- RareControl line shorted to battery voltage
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.