P2754 OBD Error Code: Problem & Solutions

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The trouble code P2754 can be explicated as Transmission Fluid Cooler Control Circuit Low. This error code would start appearing when a fault has been detected in the automatic transmission cooler control circuit by the PCM (or one of the other supporting control modules). These control modules might include (but are not limited to) the transmission control module, the body control module, the anti-lock brake control module, the instrument panel control module, the fuel injection control module, the turbo control module, the anti-theft module, cruise control module, the traction control module, proximity alert module as well as the climate control module.

It is the engine control module which would examine the transmission fluid cooler control circuit signal. This trouble code would be set by the ECM when the transmission fluid cooler control circuit signal would not be as per the parameters set by the manufacturer.

What causes this problem with the Transmission Fluid Cooler Control Circuit Low?

• Imperfect automatic transmission cooler control valve
• Issue of unbolted automatic transmission cooler control valve harness
• Unacceptable electrical connection in the automatic transmission cooler control valve circuit

1. Fuel Injector - The fuel injectors are an important component of the fuel delivery system that helps in proper utilization of the fuel entering the engine. This not only helps in taking care of the air to fuel ratio in the engine, helping the combustion process but also enhances the performance. Thus, replace faulty injector now!
2. Engine Control Module - The solenoid might cause a short in the engine control module because of corrosion in the solenoid or the wire running from the solenoid to the ECM harness.
3. Fuel Pump - If the fuel pump is damaged, it can cause engine to sputter at high speeds and sometimes may not even start. Loss of power during acceleration, rising engine temperatures and problematic throttle response are other major problems too. Replace faulty pump today!
4. Electronic Control Unit - The ECU power management control module keeps in check the hybrid battery charging functions. If the ECU is faulty, the battery pack will not be able to properly get charged and thus, the ECU might need replacement.
5. Powertrain Control Module - A trouble with the PCM would mean that it is unable to determine the right fuel mixture and would send the car engine either more or less fuel than it requires. Now when the engine gets more, the carbon emission would increase and fuel economy would drop. In case of the opposite, the engine will choke, stutter, and might start stalling sometimes.
6. Automatic Transmission Module - A defective transmission module will affect the gear shift mechanism and also affected during acceleration and deceleration. This will lead to affected engine performance and fuel delivery system. Thus, replace faulty transmission module now!
7. Diagnostic Tool - Usually any OBD code problem requires deep insight into the problem and high-grade tools in order to fix it properly. Thus, buy quality diagnostic tools form us!

It is essential to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P2754 here:

Common Symptoms

• Illumination in the service engine soon light
• Stiff, variable shifting or “gear hunting”
• Storage of an error code

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P2754:

• Make sure to mend the faulty automatic transmission cooler control valve
• Rehabilitate the defaults in the engine control module
• Recondition the non-functioning automatic transmission cooler control valve harness
• It is necessary to perform proper service of the unsound automatic transmission cooler control valve circuit

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If you want to easily diagnose this trouble code, then you must follow the steps which are mentioned here as below:

• A suitable scanner (or code reader), a digital volt/ohmmeter, and possibly an oscilloscope will be helpful in performing a successful diagnosis.
• Most OBD-II equipped automobiles utilize an output speed sensor to provide the PCM with a transmission output speed signal.
• There are a lot of models where the sensor either threads directly into the transmission housing or is mounted to the exterior of the transmission housing using bolts.
• The design of the sensor is electromagnetic and it utilizes a reluctor ring (or a specialized set of splines) on the output shaft as reference points.
• As the output shaft is turned (by the engine) the electromagnetic output speed sensor would use the spaces between the splines to provide voltage signal interruptions in the circuit.
• Then these interruptions would be received by the PCM as square waveform patterns of varying degrees of voltage and translated into transmission output speed.
• After that the powertrain control module will compare transmission output speed data with engine input speed data to decide shift patterns, as well as certain engine drivability functions. The typical output speed sensor utilizes a three-wire connector but inspect the vehicle manufacturer’s wiring diagram to confirm the specific design of the vehicle.
• The initial wire is a reference voltage signal (usually 5-volts), the second wire will normally be a ground wire, and the signal wire would be the third wire.
• As the reluctor ring passes by the electromagnetic sensor, the 5-volt reference signal is completed with the protruding metal surfaces.
• The recessed surfaces of the reluctor provide voltage interruptions and these interruptions are input to the PCM via the signal wire.
• You must start your diagnosis with a visual inspection of system wiring, connectors as well as components.
• Repair or replace any open, shorted, damaged, or corroded items as per the requirement and then the entire system should be retested to make sure that repairs were successful.
• Pay specific attention to wiring and connectors that have been contaminated because of engine oil or leakage in the transmission fluid, burned on hot exhaust pipes, or defected due to road debris. If the system wiring, connectors as well as constituents appear to be in normal working order, then the scanner should be connected to the diagnostic connector and record all stored trouble codes as well as freeze frame data.
• This information can prove to be very helpful in diagnosing intermittent conditions that may have contributed to this code being stored.
• Now once all the codes have been cleared, then the automobile should be operated to check if the code is returning back again or not.
• If the code fails to immediately return, then it would indicate that there is an intermittent condition.
• Intermittent conditions can prove to be quite challenging to diagnose and in some cases it should be allowed to worsen before a right diagnosis can be made.
• If the code immediately returns, then the reference voltage and ground signals at the output speed sensor should be inspected.
• If either the reference voltage or ground circuits are open, then utilize the digital volt/ohmmeter to inspect for continuity (disconnect all associated control modules from the circuit before inspecting circuit resistance or controller damage may occur) and resistance in both circuits.
• Repair or replace system circuits/connectors as per the requirement and retest the system to ensure that repairs were successful. The manufacturer’s wiring diagram should be used for the output speed sensor, examine all associated circuits and the sensor for resistance and continuity and compare your findings with manufacturer’s specifications.
• Repair or restore system circuitry, connectors, and components that fail to coincide with specifications set by the manufacturer.
• It is very essential to retest the system to ensure a successful repair. If all system circuits are intact, then you should connect the oscilloscope and observe live transmission output speed sensor data.
• Carefully watch for glitches or “soft spots” in the waveform pattern and then repair or restore system circuitry, connectors, or components as per the requirement. If all circuits coincide with manufacturer’s specifications, and the waveform pattern is within acceptable limits, then it would mean that there are some faults in the powertrain control module.
• You must keep in mind that the failure in the PCM is very rare and replacement will need reprogramming.

Common Mistakes When Diagnosing The P2754 Code

• Low transmission fluid related issues
• Quirks in the transmission cooler
• Issues related with the car wiring