P2755 code meaning
Transmission Fluid Cooler Control Circuit High
Powertrain system Generic code P27xx codes Check engine light
What P2755 means
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.
P2755 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2755
- Check engine lamp on
- Cooling valve permanently on or off
- Slower warm-up of the transmission in cold weather
Common causes of P2755
- Most likelyControl wire shorted to a battery-voltage line
- PossibleValve internally shorted to its supply terminal
- Less likelyModule output transistor no longer switching
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Trans fluid cooler valveWiring harness
What each part of P2755 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 7 | Area: transmission. |
| 55 | The exact fault in that area. |
What to do next
- Note P2755 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2755
What does P2755 mean?
P2755 means "Transmission Fluid Cooler Control Circuit High". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P2755?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2755 fail an emissions test?
Yes, it can. P2755 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2755 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2755 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.