Error Code P279D: What It Means & What To Do?

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The trouble code P279D can be explained as Four Wheel Drive (4WD) Range Signal Circuit. This diagnostic fault code is a generic powertrain code, which means that it would apply to the OBD-II equipped vehicles. The specific repair steps can vary as it depends upon the vehicle make and model. One thing which you must keep in mind that its symptoms as well as causes would surely vary as it depends upon a number of things. The four wheel drive (4WD) range signal circuit is being monitored by the transmission control module. This trouble code would be set by the TCM when the four wheel drive (4WD) range signal circuit would not be as per the specifications set by the manufacturer.

This trouble code is generic, which would mean that it can apply to all the vehicles which are equipped with the OBD-II or the vehicles which are made since 1996 up to the present. The specifications on the definition, the troubleshooting steps as well as repairs can always vary from one vehicle make to another. This can happen because of a lot of reasons and the mechanic should diagnose the specific cause for this code.

What causes this problem with the Four Wheel Drive (4WD) Range Signal Circuit?

• Quirks in the four wheel drive range
• Four wheel drive range harness might be unlocked
• Four wheel drive range circuit bad electrical connection

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2. Automatic Transmission Module - Faulty transmission module can cause problematic down shifts and upshifts, leading to stalling while accelerating or slowing down. This can also hamper many transmission system parts. Thus replace it now!
3. Electronic Control Unit - The ECU coordinates with the temperature sensor to control the blower fan for keeping the battery temperatures under control. So, replace faulty ECU components now!
4. Powertrain Control Module - Check for PCM error which might be due to circuit faults that might require complete replacement and reprogramming. Replace it now!
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It is vital 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 P279D here:

Common Symptoms

• Appearance of the service engine soon light
• The 4-wheel drive system might not function properly

Looking out for some ways with the help of which you can correct this fault code? Then you have arrived at the correct place. We are here to help you out, so you must check out the steps mentioned below as follows:

• Make sure to mend the faulty engine control module
• Repair or replace the quirky four wheel drive range
• The malfunctioning four wheel drive range harness should be repaired or replaced as per the need
• Carefully adjust the faults in the four wheel drive range circuit

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Here are some steps which you should follow in order to diagnose this fault code:

• As an initial step the mechanic will carefully inspect the vehicle with the help of a scanner.
• After this, the technician will connect a scanner to the diagnostic code so that he can recover all the codes and freeze frame data.
• Note down this information as it can clearly help for further diagnosis.
• After careful inspection, he will reset the code and test drive your vehicle to check for reappearance of the codes.
• He will know that an intermittent condition persist, if the code does not return instantly.
• But if the error code returns quickly, the vehicle is test driven, and then he has to inspect the transmission fluid.
• If four wheel drive range circuit is damaged, the mechanic will replace them quickly.
• Most often, whenever the mechanic carries out any repair work, he will reset the code and test drive your car, to check if the codes return immediately. This can preferably help the mechanic to know what caused this error code in the vehicle.

Common Mistakes When Diagnosing The P279D Code

• Non performance of the 4-wheel drive switch
• Failure in the transfer case internally
• Faults in the transmission control module (TCM)
• Issues related to the wiring