Guide To P2771 OBD Error Code Solutions

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Are you experiencing irregular acceleration? Improper gear shifts resulting in stalling and jolts? Is there an effect on the fuel consumption patterns of the vehicle? Is there a difficulty in shifting between two wheel and four-wheel drive? These are a direct indication towards a problematic transmission and drivetrain, thus causing OBD code P2771 error getting stored in the Powertrain Control Module (PCM) and Check Engine Light getting illuminated.

This code is a generic trouble code, meaning it applies to all vehicles equipped with the OBD-II system, especially those made from 1996 up to present. It’s also more common among Audi, Citroen, Chevrolet, Ford, Hyundai, Nissan, Peugeot, and Volkswagen vehicles. Specifications on the definition, troubleshooting, and repairs, of course, vary from one make and model, powertrain configuration type, to another.

The 4-wheel drive actuates the gear ratios differently than the 2-wheel drive as per the vehicle response requirement. When the PCM senses that the transfer case control module has failed to shift to the 4-wheel low setting, OBD code P2771 gets stored in the system.

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

• 4-wheel drive low switch faulty
• 4-wheel drive low switch circuit faulty
• Switch circuit wiring and harness problem
• Poor electrical connections to the switch circuit
• Transfer case control module failure

1. Engine Control Module - Most of the time it is difficult to intercept the ECM faults and thus must be checked for thoroughly. There can be a problem with the circuit or the software might have malfunctioned. Thus repair, replace or reprogram the component as per requirement.
2. Powertrain Control Module - If the PCM is faulty, it can store wrong OBD codes and can lead to misdiagnosis. This can happen due to misinterpretation of data received from the various sensors and components which also affects the vehicle’s performance. Thus, replace it immediately.
3. Electronic Control Unit - If the ECU is at fault, it will not be able to read the boost converter temperatures correctly leading to underperformance. Thus, replace faulty ECU now!
4. Diagnostic Tool - Choose from our diagnostic tools collection that will come in handy to detect and correct the OBD error code.
5. 4 Wheel Drive Switch - Check for faulty switch as it can be the prime reason for drive modes not engaging properly. Buy new 4-wheel drive switch now!

Willing to know some common symptoms of OBD Code P2771? Your wish is our demand. Have a look at them below:

Common Symptoms

• Check engine light on
• Improper gear shifts
• Engine stalling
• Failure to shift from 2-wheel to 4-wheel drive

We have listed out some ways which would help you to correct the occurrence of OBD Code P2771. They are mentioned here as follows:

• Change 4-wheel drive switch
• Change defective control solenoid
• Change faulty transfer case control module
• Change defective transmission valve body
• Change corrosion, damage or broken connectors and wiring
• Replace defective PCM and TCM

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, Connectors, 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.

If you want to easily diagnose this fault code P2771, then all you have to do is to follow the steps which are mentioned below:

• The first step is to check for poor electrical connections and faulty, damaged or corroded wiring and connectors in relation to the control module and the switch circuit.
• Next, download the stored codes and freeze frame the data for further usage. Clear the codes and test drive the vehicle to see if the code returns or not. If it does, then the error is present.
• Check for the input voltage to the 4-wheel drive circuit and match it with the manufacturer’s specifications. If no voltage is present, check for continuity between the circuit and the fuses.
• Similarly check for the output voltage to the 4-wheel drive low mode and also check the continuity. If no voltage is present, suspect the switch to be faulty.
• After doing all the repairs, retest the vehicle and see if the code returns or not. If all the faults have been corrected, then the OBD code should go away.

Common Mistakes When Diagnosing the P2771 Code

A lot of people make a big mistake of attempting to diagnose the TCM. Save yourself a big headache and make sure that you are addressing the correct circuit problem before beginning your diagnosis.

• 4-wheel drive switch failure
• Transfer case control module failure
• Faulty wiring and connectors