Error Code P2791: What It Means & What To Do?

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The trouble code P2791 can be explained as Gate Select Direction Circuit Low. The gate select direction circuit signal is being monitored by the transmission control module. This trouble code would be set by the TCM when the gate select direction circuit signal would not be as per the specifications set by the manufacturer.

Manual transmissions have a sensor built into the shift lever which would inform the engine computer (PCM) what gear the transmission is in. Now if the shift lever position sensor would send the PCM an improper signal, then it would give rise to this fault code. 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 Gate Select Direction Circuit Low?

• Quirks in the range sensor
• Imperfect transmission shifter
• Transmission shifter harness might be opened or shorted
• Some issues related to the powertrain control module (PCM)
• Broken shift lever assembly

1. Engine Control Module - ECM faults are rare but can be a big problem as faulty ECM will cause wrong vehicle operations and can also result in wrong OBD codes getting stored in the system which can also cause misdiagnosis. Thus, replace faulty ECM components now!
2. Manual Transmission Shifter - If your car is not going into gear at all, then it might not be a defective transmission. It can just be a flawed transmission shifter cable. It would be nice if you get it replaced on time.
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. Automatic Transmission Module - If the transmission module is faulty, then the vehicle might experience erratic gear shifts and throttle response. The engine might also stall will be accelerating and slowing down. Thus, replace faulty automatic transmission module, if required.
5. Powertrain Control Module - Check for PCM error which might be due to circuit faults that might require complete replacement and reprogramming. Replace it now!
6. Diagnostic Tool - In order to detect the error, one needs high grade diagnostic tools. Visit us today to grab amazing deals.

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 P2791 here:

Common Symptoms

• Appearance of the service engine soon light

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:

• The shift lever assembly should be restored to working order
• You must fix the defective transmission shifter harness
• Make sure to mend the corroded areas that may be affecting the gear shift
• Repair or replace the quirky range sensor
• Recondition the non-functioning powertrain control module
• Adjust the flawed transmission shifter

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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. The gate selection direction sensor is utilized to decide (for the PCM) which gear the transmission is placed in at any given interval, as well as acting as a neutral safety switch for engine ignition. Keep in mind that many gate selection direction sensors are of a variable resistance variety. The switch is situated in or near the transmission shifter assembly. Now when the shift lever would be moved (via the shift lever in the cockpit and the shifter cable) the gate selection direction sensor pivot is moved to various contacts. The varying levels of voltage are read by the powertrain control module, regulated by the differing levels of resistance in the switch contacts, as the gears in which the transmission shifter are placed. The PCM would then decide the shift strategy, fuel delivery theory, engine ignition timing, and other drivability functions accordingly. As transmission, ABS, and engine inputs are received by the powertrain control module, it decides whether or not the transmission is in the correct gear for the driving conditions and reacts accordingly. You must start your diagnosis with a visual inspection of system wiring, connectors, and constituents. Make sure to repair or replace any open, shorted, damaged, or corroded items as per the requirement and then the entire system should be retested to make sure that repairs were successful. If the system wiring, connectors, and components appear to be in good working order, then you should connect the scanner to the diagnostic connector and record all stored trouble codes as well as the freeze frame data. This information can prove to be extremely helpful in diagnosing intermittent conditions that may have contributed to this code being stored. Now once all the codes have been cleared, then you should operate the vehicle to see if the code returns. If the code fails to immediately return, then you might have an intermittent condition. Intermittent conditions can prove to be quite challenging to diagnose and in extreme cases it should be allowed to worsen before a right diagnosis can be made. If the code returns back immediately, then you should check for battery voltage and ground signals at the gate selection direction sensor. If either the ground or battery voltage circuits are open, then utilize the digital volt/ohmmeter to check for continuity (disconnect all related control modules from the circuit before inspecting circuit resistance or controller damage may occur) and resistance in both circuits. Repair or restore system circuits/connectors as per the requirement and retest the system to ensure that repairs were successful. Use the manufacturer’s wiring diagram for the gate selection direction sensor, check all associated circuits and the sensor for resistance and continuity and compare your findings with specifications set by the manufacturer. Repair or replace system circuitry, connectors, and/or components that fail to coincide with specifications set by the manufacturer. The system should be retested to ensure a successful repair. If all circuits coincide with manufacturer’s specifications, suspect a faulty powertrain control module. Just remember that PCM failure is rare and replacement would need reprogramming.

Common Mistakes When Diagnosing The P2791 Code

• Non-performance of the powertrain control module
• Failure in the shift lever assembly
• Issues related to the wiring