P2797Electric/Auxiliary Transmission Fluid Pump A Performance/Stuck Off
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2797 says pump A was asked to deliver but no useful pressure resulted. GM checks this on CVTs during an engine auto-start: with the pump commanded and over 400 kPa requested at both pulleys, both pressure sensors reading under 200 kPa for more than 0.525 s set the Type B code. GM bulletin 19-NA-200 (Malibu 2019–2025, Trailblazer, Encore GX, 2025 Equinox) blames an internal pump failure and replaces pump and harness. Subaru found false detections on 2023–2024 Legacy and Outback 2.4 turbo CVTs, caused by forward clutch engagement at restart, and released TCM files (16-145-23R). Stellantis traces P2797 on some 2026 Charger, Grand Cherokee and Wagoneer models with the 880RE eight-speed to a failed oil pump motor (21-053-26). Stop-start is usually the first casualty.
- What you may notice
- MIL on
- Stop-start inoperative
- Shock or surge when the engine restarts at a stop
- Service transmission message
- Likely causes
- LikelyInternal failure of the auxiliary pump or its motor
- PossibleControl software misjudging pump output (TCM update available)
- PossibleDamaged pump wiring harness
- RareLow fluid or internal leakage preventing pressure build-up
- 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: €0 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.