Fault code P2755 – transmission fluid cooler control circuit high

Fault code P2755 is called “Transmission Fluid Cooler Control Circuit High” but in different programs it may be called differently. This fault designation applies to all vehicles equipped with OBD-II.

Technical description and explained code P2755

This diagnostic trouble code (DTC) is a generic transmission code. Error P2755 is considered a general code because it applies to all makes and models of vehicles. Although the specific repair steps may vary slightly depending on the model.

Fault code P2755 – transmission fluid cooler control circuit high

Many vehicles have an automatic transmission control module called a transmission control module (TCM). The Powertrain Control Module (PCM) communicates with the TCM. To monitor the automatic transmission for malfunctions.

If your vehicle retains code P2755, it means that the powertrain control module (PCM) has received a data input signal. Which indicates that the transmission control system (TCS) has detected a problem that requires the malfunction indicator lamp (MIL) to turn on.

Vehicles with automatic transmissions often have an electronically controlled valve for cooling and heating the transmission fluid. This valve helps regulate fluid flow to the cooler during operation.

The valve helps the transmission fluid warm up faster to its normal operating temperature. It is controlled by the PCM or similar controller, which relies on data from sensors in the controller’s network (CAN).

If error P2755 is registered in the automatic transmission cooler control circuit, the fault code is stored and the malfunction indicator lamp (MIL) illuminates. Some models may require up to 8 drive cycles with the problem before the MIL will illuminate.

Symptoms of vehicle malfunctions

The main signal that an error P2755 has occurred is the Malfunction Indicator Lamp (MIL) is also known as the CheckEngine Light.

It can also be warning signs such as:

  1. You may have difficulty shifting gears while driving.
  2. Unstable or abrupt gear shifting.
  3. Shifting gears takes a long time.
  4. Transmission may be put into emergency mode.

A stored code P2755 indicates that a potentially serious fault has been detected. The conditions that contributed to the stored code should be corrected as soon as possible.

Factors that can cause this error code

The error code P2755 can mean that one or more of the following problems have occurred:

  • Faulty automatic transmission cooler control valve or valve position sensor.
  • Ground wire breakage.
  • Control module ground is loose.
  • Corrosion, open or shorted wiring or connectors.

How to fix or reset OBD-2 code P2755

Some suggested steps for troubleshooting and fix the error code P2755:

  1. Connect an OBD-II scanner to the vehicle’s diagnostic connector and read all stored data and error codes.
  2. Clear the error codes, perform a test drive, and check if the P2755 fault appears again.
  3. Visually inspect the electrical wires and connectors.
  4. If necessary, repair or replace any shorted, broken, damaged, or corroded components.
  5. Test the automatic transmission cooler control valve and valve position sensor.

Diagnose and repair of problems

The first thing to do when the P2755 malfunctions is to check the electrical part for damage. In today’s vehicles, electrical and electronic signals require good cabling for proper data transmission. Any faults, such as breaks, disconnected connectors or corrosion, can interrupt signals, leading to transmission control failures.

Check the battery pack, as some PCM and TCM modules are sensitive to low voltage. If the battery is low, the system may detect this as a failure. Make sure the battery is putting out at least 12 volts, and that the alternator is running properly, at least 13 volts at idle.

Low ATF fluid levels can result in no pressure in the box, which can also be a problem that the TCM detects as a failure. Fuses should not be overlooked either, as a blown fuse is a common problem.

On which vehicles does this problem occur most frequently

Fault code P2755 can occur on different vehicles but there are statistics on which brands this occurs most often. Here is a list of some of them:

  • Audi (A6, A7, A8, Q7)
  • Mercedes-Benz
  • Nissan
  • Renault

Fault code P2755 can sometimes be found with other errors. The most common are the following: P0802, P2753, P2754.


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