P0C29Electric/Auxiliary Transmission Fluid Pump A Driver Circuit Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0C29 means the driver stage of auxiliary pump A does not behave as commanded, for instance the pump does not reach its target or the activation is reported as implausible. Volkswagen Group documents it on the 7-speed DSG 0GC (DQ381): VW lists P0C29 for the 2018 Golf R as implausible activation of auxiliary hydraulic pump 1 (V475), often with clutch and gear actuator codes as consequences; Audi's bulletin for the 2017-18 A3, A3 Cabriolet and S3 with gearbox dated up to 26 September 2017 calls for replacing the auxiliary hydraulic pump when only P0C29 remains. The customer sees a Gearbox Malfunction warning. VW improved the pump from October 2017 production. P0C2A is a stalled motor, P0C26 to P0C28 current faults.
- What you may notice
- Gearbox Malfunction warning in the instrument cluster
- Consequential clutch or gear actuator codes, limp mode
- Likely causes
- LikelyAuxiliary hydraulic pump V475 of early production faulty (VW/Audi 0GC)
- PossiblePoor contact at the pump electrical connection
- RareTransmission control software not updated per service action
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €400 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.