P2772 - OBD Trouble Code

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If you are experiencing unusual response of the throttle, lack of power from the car engine, impact on the fuel economy, engine stalling and harsh shifts and frequent illumination of the Check Engine Light, it might be an indication of the OBD Code P2772 error. 

When the PCM detects that the 4-wheel drive low switch circuit is not functioning properly, P2772 gets flashed.

4-Low provides your vehicle with significantly more torque, allowing the vehicle to get out of tricky situations. When using 4-Low, it’s important to keep your vehicle at slow speeds. If you’re in 4-Low and feel the urge to drive fast, chances are that the vehicle can handle the road conditions in 4-High without any issue. Usually the 4-Low is used on extremely slippery surfaces, very steep inclines, heavy snow, climbing or descending boulders, powering through thick mud or sand or driving through deep water.

When the 4-wheel low is performing out of range, OBD code P2772 gets stored in the powertrain control module.

What causes this problem with the Four Wheel Drive Low Switch Circuit Range/Performance?

• Failed four wheel drive low switch
• Failed switch harness is open or shorted
• 4 wheel drive low switch circuit poor electrical connection
• PCM programming errors

1. Electronic Control Unit - ECU monitors the temperature differences in the boost converter with the help of the temperature sensors to prevent the converter from overheating and malfunctioning. Thus, replace faulty ECU immediately.
2. Automatic Transmission Module - Sometimes the automatic transmission module is unable to communicate or correctly anticipate the speed of the vehicle and thus creates difficulty in gear shift leading to sluggish acceleration, throttle response and stalling. Thus can also hamper a lot of components physically and thus must be checked and replaced, if required.
3. Engine Control Module - ECM failures and faults can be very difficult to find and resolve as these are very rare and might require a complete reprogramming of the system to avoid wrong codes from getting stored in the system, leading to misdiagnosis. Replace it now!
4. Powertrain Control Module - Faulty PCM can disrupt the normal functioning of the vehicle by affecting the transmission system and the fuel delivery system. This will cause the system to store wrong OBD error and thus can lead to misdiagnosis.
5. Diagnostic Tool - In order to be that DIY guy, you need few diagnostic tools to get your car problems pointed out easily. Our diagnostic tools collection will come in handy to do so, so why not have a look?
6. 4 Wheel Drive Switch - If the 4 wheel drive switch is faulty, the vehicle will not be able to enter the low drive mode, causing serious driving issues. Thus, replace faulty switch now!

Our main motive is to achieve customer satisfaction and that’s why we will help you to diagnose P2772 code by mentioning some major symptoms below:

Common Symptoms

• Stored OBD error code and an illuminated warning light
• Reverse gear engagement delayed, or may not engage at all
• Transmission slippage
• Erratic gear shifts and delayed response
• Affected fuel economy
• Malfunction indicator light on

Have a look at some ways with which you can correct the P2772 code:

• Transmission control module replacement
• 4 wheel drive switch replacement
• Repairing an open or short in the wiring harness or replacing it
• Broken electrical connections repair or replace

There is no need to get strained if your OBD Code is still flashing up as we are here at your service. Have a look at our superior variety of PCM, Transmission Control Module, Transfer case internal, Four Wheel Drive Low, Switch, Digital Volt, Ohmmeter, Clutch Position Sensor and many more. Now all your problems would vanish within no time.

Here are some steps which you should follow in order to diagnose this fault code P2772:

• The P2772 code should be diagnosed with an OBD-II trouble code scanner. A trained technician will look at the freeze frame data on the scanner to assess the code, and to check for the presence of any other trouble codes.
• The mechanic will begin by visually inspecting the electrical components in the switch circuit. Any wires that are shorted, connectors that are open or corroded, or fuses that are blown will need to be replaced.
• Inspect the switch circuit to determine if damage has occurred that will require extensive repairs. Perform a circuit continuity test to check for open or short in the circuit.
• Check for voltage output and input from the switch circuit and replace if the 4 wheel drive switch is faulty.
• Check for Transmission Control Module and Powertrain Control Module faults that may require repairs, reprogramming or replacement. Although, it is rare but still must not be rules out.

Common Mistakes When Diagnosing the P2772 Code

It is important to follow the diagnostic steps properly to correct the OBD code P2772 error. Following are the problems that can be missed and are mostly the reason for this kind of problem:

• Internal transmission failure
• Powertrain Control Module (PCM) failure
• Transmission Control Module (TCM) failure
• Transfer case module failure
• Wiring issue and connector problems
• 4 wheel drive switch faulty