P2790 - OBD Trouble Code

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The trouble code P2790 can be elucidated as Gate Select Direction Circuit. This error code would start indicating when the powertrain control module would detect a malfunction in the gate select direction circuit for a specific ear lever position or direction. The transmission gate select direction sensor would then input the data to the PCM where it is used to calculate engine RPM, fuel delivery strategy, and engine timing, among other things. This error code would apply to automobiles equipped with dual clutch adaptive transmissions, automated manual transmissions, manual transmissions and automatic transmissions.

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.

What causes this problem with the Gate Select Direction Circuit?

• Malfunctioning range sensor
• There can be inoperative transmission shifter
• Transmission shifter harness might be unlocked
• Unusable powertrain control module (PCM)
• There can be distorted shift lever assembly

1. Manual Transmission Shifter - Many a times the manual transmission shifter fails due to stretching. It is very common with automobiles which have manual transmissions as the driver moves the shifter more frequently. Buy top notch manual transmission shifter from us at economical prices.
2. 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.
3. Transmission Control Module - The TCM monitors the functioning of the transmission system and will store this OBD code if the fluid pump does not function properly. Contrary, the TCM can also be faulty and might need reprogramming and replacement. Thus, replace it now!
4. 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.
5. 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?
6. Diagnostic Tools - Use factory grade diagnostic tools to resolve OBD code P2790 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

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:

• Make sure to mend the faulty range sensor
• Repair or replace the quirky powertrain control module
• Rehabilitate the defaults in the transmission shifter
• Carefully adjust the corroded areas that may be affecting the gear shift
• Recondition the non-functioning transmission shifter harness
• It is necessary to perform proper service of the unsound shift lever assembly

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

• You will require a scanner (or code reader) and a digital volt/ohmmeter to successfully diagnosing this fault code. 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 P2790 Code

• Powertrain control module might start failing
• Some issues related to the shift lever assembly
• Issues with the car wiring