P279E OBD Error Code: Problem & Solutions

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The trouble code P279E can be elucidated as Four Wheel Drive (4WD) Range Signal Circuit Range/Performance. 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. The four wheel drive switch would allow the person who is driving the car to shift from 2-wheel drive to 4-wheel Low or 4-wheel high, and it all depends upon the driving conditions. Now if an unusual signal would be sent back by the 4-wheel drive switch, then the P279E error code would start appearing.

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

• Malfunctioning four wheel drive range
• Four wheel drive range harness might be unlocked
• Four wheel drive range circuit might have bad electrical connection

1. Engine Control Module - Dead cells in batteries can cause a failure in the engine control module. Many times a battery is left in the rig long after a cell has died. This would affect the grounding in the car battery.
2. Powertrain Control Module - If there are some faults in the PCM, then it may throw off the timing and fuel settings of the engine, which can negatively affect the performance. A flawed PCM may cause the vehicle to experience a reduction in fuel efficiency, power as well as acceleration.
3. Electronic Control Unit - Do you know that the poor performance or unexplained drops in fuel economy or efficiency are often associated to onboard car computer problems, or defective ECU issues?
4. 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!
5. Diagnostic Tools - Use factory grade diagnostic tools to resolve OBD code P279E error. Buy new diagnostic tools and equipment for us.

You might be thinking that how would you diagnose these problems? We at Parts Avatar Canada would help you diagnose the major symptoms easily.

Common Symptoms

• Visibility in the check engine light
• Non functioning 4-wheel drive system

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:

• You must fix the defective four wheel drive range circuit
• Carefully adjust the faults in the four wheel drive range
• The four wheel drive range harness should be restored to working order
• It is necessary to perform proper service of the unsound powertrain control module

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

After verifying the P279E code with an OBD-II scanner, the mechanic should begin with a visual inspection of all electrical components, especially looking for some issues in the four wheel drive range. Any issues should be repaired, and the code should be cleared from the system. If the code reappears after a retest, the mechanic should then move on to performing voltage tests and resistance tests on the sensor, and comparing the information to the manufacturer’s specifications. If the readings are within the correct limits, then the sensor needs to be replaced. However, if the readings are not within the correct limits, then the issue lies elsewhere. The mechanic should continue checking each possible cause, clearing the code and retesting the system after each attempt, to be sure that the correct solution is found.

Common Mistakes When Diagnosing The P279E Code

• Transfer case might start failing internally
• Defects in the transmission control module (TCM)
• Some issues related to the 4-wheel drive switch
• Issues with the car wiring