P2774 OBD Error Code: Problem & Solutions

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Error Code P2774 is defined as Four Wheel Drive Low Switch Circuit High Issue. This means that the powertrain control module (PCM) has detected a high voltage signal from the four wheel drive low switch circuit.

What 4WD does is increases the chance you can get traction when you’re driving on dicey surfaces. Instead of relying on only two powered wheels for traction (2WD), you’ve got four moving wheels that could possibly hit good traction to keep the car moving. The drive switch allows the driver to shift between these different drive modes and if the PCM detects a high voltage level from the switch circuit, OBD code P2774 gets stored in the system.

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

• Defective transmission speed sensor
• Defective 4wd switch
• Defective or faulty switch selector wiring
• Defective shift solenoids
• Defective switch selector electrical connection
• Damaged transmission valve body

1. Engine Control Module - It is not always the components, but the ECM that can also be faulty. It can cause misinterpretation of correct data thus leading to wrong operational decisions which will affect the transmission and overall engine performance. Thus, replace faulty module and reprogram it now!
2. Powertrain Control Module - Powertrain Control Module can also be faulty in rare cases and thus needs through checks for system and software errors. Thus check and replace it, if required.
3. Electronic Control Unit - The ECU manages the cooling system to control the battery operating temperatures and thus must be replaced if found faulty. Thus, buy new ECU modules and components from us!
4. Diagnostic Tool - Make use of quality diagnostic tools to resolve any OBD error code. Buy quality diagnostic tools from us!
5. Transmission Control Module - The car has to shift through various gears with the precise timing in order to speed up, and the module is the component that is mainly responsible for this operation. An acceleration delay means that it has gone bad and needs fixing.
6. 4 Wheel Drive Switch - Defective 4wd switch will cause transmission issues with gear slippage. Irregular power response from drivetrain can also be a bug issue. Thus, replace it now!

If you are facing OBD error code P2774, then there are significant common symptoms that can be felt or observed. We have worked out a list here to help you out in understanding this problem better.

Common Symptoms

• Erratic or harsh transmission shift points
• Increased fuel consumption
• Not shifting from 2wd to 4wd
• Transmission fails to shift
• Fluctuation in speedometer (odometer)
• Lack of speedometer operation
• Engine may stall when coming to a stop

It is very important to fix the fault code P2774. So here are some ways with which you can correct this issue:

• 4WD switch or actuator repair or replacement
• Failed sensors replacement
• Faulty solenoids or switches replacement
• Damaged or corroded wiring harness and/or connectors replacement

However, if you face any issue then we have stocked a wide range of best priced PCM, Transmission Control Module, Transfer case internal, Four Wheel Drive Low, Switch, Digital Volt, Ohmmeter, Clutch Position Sensor and more to help you out in fixing your car.

If you want to easily diagnose this fault code P2774, then all you have to do is to follow the steps which are mentioned below:

First off, conduct a visual inspection of the 4wd switch selector. This is to determine the condition of the wiring. Any damages must be repaired or replaced as needed.

Then, test the voltage and ground wiring to the switch circuit to see if there are wiring failure or problem in the switch itself. If the wiring checks out, the mechanic will replace the switch selector, reset the PCM and then take the vehicle for a test drive.

If input voltage is present but there is no output voltage, with 4WD engaged, then the 4WD switch could be faulty. Replace the switch if needed, and retest the system afterward. Check for voltage at the actuator for 4WD, if voltage is present at the clutch position sensor’s output circuit.

If no voltage is present, check for resistance and circuit continuity between the switch and PCM, and compare your readings to manufacturer’s specs. Also, repair any short or open in the switch circuit.

Common Mistakes When Diagnosing the P2774 Code

Some of the common mistakes done while changing diagnosing the OBD code P2774 are:

• Engine Misfire problem
• Internal Transmission problem
• Driveline problem
• 4wd switch selector issue
• Affected wiring and connector
• Input speed sensor issue
• Crankshaft position sensor issue