P2755Transmission Fluid Cooler Control Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- With P2755 the module sees a high level on the cooler actuator line at a moment when its driver should pull it down, the signature of a short to battery voltage or of a low-side driver that no longer switches. The cooling valve then either cannot be activated or stays energised all the time. No manufacturer publishes P2755; the component is the same one that Audi diagnoses on the 2023 Q7 and SQ7 under the open-circuit code P2753, and CARB treats such outputs as monitored comprehensive components. A damaged harness rubbing against a powered wire, a defective valve with an internal short to its supply pin, or a failed output transistor are the usual findings. Unlike P2754 a fuse rarely blows, so the fault can persist unnoticed until fluid temperatures drift.
- What you may notice
- Check engine lamp on
- Cooling valve permanently on or off
- Slower warm-up of the transmission in cold weather
- Likely causes
- LikelyControl wire shorted to a battery-voltage line
- PossibleValve internally shorted to its supply terminal
- RareModule output transistor no longer switching
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €40 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.