Guide To P2797 OBD Error Code Solutions

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The trouble code P2797 can be described as Auxiliary Transmission Fluid Pump Performance. There is a motor driver in the Drive Motor Generator Power Inverter Control Module which controls the auxiliary transmission fluid pump. Hydraulic pressure is created in the transmission by the auxiliary transmission fluid pump. This would then allow the transmission to shift gears.

If the motor driver would detect that the pump is not capable of producing the pressure as per the request, then this fault code would be set. This diagnostic fault code is a generic powertrain code, which means that it would apply to the OBD-II equipped vehicles. The specific repair steps can vary as it depends upon the vehicle make and model. This would also give rise to the illumination of the check engine light.

What causes this problem with the Auxiliary Transmission Fluid Pump Performance?

• There can be distorted electronic transmission fluid auxiliary pump
• Electronic transmission fluid auxiliary pump harness is open or small
• There can be inoperative drive motor generator power inverter control module failure
• The transmission fluid pump control relay might be flawed

1. Transmission Fluid Pump Harness - Damaged transmission fluid pump harness can cause problematic transmission performance and can lead to transmission slipping, rough shifts, fuel leakages and delayed engagements. Buy new harness now!
2. 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.
3. Transmission Fluid Pump - Faulty transmission fluid pump can cause harsh shifts and audible transmission noise. This leads to decreased performance and chances of increased physical damages to the transmission components. Thus, replace it immediately.
4. 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!
5. Automatic Transmission Module - A defective transmission module will affect the gear shift mechanism and also affect during acceleration and deceleration. This will lead to affected engine performance and fuel delivery system. Thus, replace faulty transmission module now!
6. 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.
7. 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?

We care for our customers and that’s why we can totally understand your problem. That’s the reason why we have listed out some major symptoms behind the flashing up of OBD Code P2797. They are mentioned here as follows:

Common Symptoms

• Check engine light can start flashing up
• Excessive heat in the transmission
• Reduction in the shifting efficiency

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P2797:

• It is essential to restore the flawed powertrain control module
• Rehabilitate the defaults in the electronic transmission fluid auxiliary pump harness
• Carefully adjust the faults in the electronic transmission fluid auxiliary pump
• Recondition the non-functioning drive motor generator power inverter control module
• Adjust the flawed transmission fluid pump control relay 

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Do you wish to diagnose P2797 error code easily? Here are some steps which you should follow in order to diagnose this fault code:

Some models which use an electronic auxiliary transmission fluid pump to help regulate transmission fluid pressure by raising the flow of fluid throughout the transmission, transmission cooler, and torque converter. There is an electronic controller which controls the pump by utilizing the system of wiring and relays. The powertrain control module would then utilize the input data from various transmission sensors to decide when the auxiliary transmission fluid pump must be turned on and turned off. CAN stands for “controller area network.” The CAN represents a communication bus that would allow a number of microcontrollers to communicate with one another without the need for a host computer. It is a message-based protocol initially designed for automotive use. The network of CAN bus is actually a complex conglomeration of wiring harnesses and connectors used as a pipeline of information which is shared between two or more automotive control modules. Every electrical function of the vehicle is virtually controlled by these controllers, with the powertrain control module being the primary controller. Control modules receive input data from various sensors and emit output signals to system constituents and other control modules. If this proves to be a CAN bus associated situation, then it could prove very challenging to diagnose by an amateur technician.

Unlike other diagnostic codes, this type of code can sometimes be best left to a professional simply because of the bulk of circuitry involved. A technician which is experienced should use a specialized scanner (Autohex or Tech II) to determine the general area of the malfunction much more rapidly and easily than someone using a code reader as well as a digital volt ohmmeter. If you will disconnect and check every single pin of the CAN bus then it can consume a lot of time as well as money. Also make sure to install some type of memory saving device, test the PCM and other controllers lose their memory and sometimes they might require reprogramming. A specialized diagnostic CAN scanner will depict pin values and control module operation without risking a meltdown. It can diagnose computer and issues related to circuitry correctly by monitoring automobile operation while the vehicle is being operated. If you want to diagnose this type of code using a digital volt ohmmeter, then it would entail probing thousands of circuits separately. One probe which is misplaced could destroy expensive control modules and require that the vehicle be totally reprogrammed. At the most, you may attempt to perform a continuity test after all control modules are disconnected, and this could literally require 40-hours or more, based upon the automobile.

There are some applications are equipped with up to 18 separate control modules. If you choose to tackle this monumental task, then you must start with a careful visual inspection of all system circuitry, connectors, and fuses. Control module ground circuits should be inspected for continuity with battery ground. Generally, the faulty system grounds are reason behind the occurrence of these types of codes. An auxiliary ground cable can be supportive in diagnosing system ground discrepancies.

Engine and transmission ground cables, straps, and wires are sometimes left dangling once the repairs have been made. Search for loose or corroded electrical connectors that might rise the circuit resistance and cause these types of codes to be stored. Obtain a CAN bus system wiring diagram and/or pin out value chart, then use the digital volt ohmmeter to test continuity between individual controller connectors. You must compare your findings with the manufacturer’s referenced values and repair open or shorted circuits as per the need. It is more economical to restore the faulty wiring rather than attempting to remove it from the complex web of wiring harnesses.

Common Mistakes When Diagnosing The P2797 Code

• The auxiliary transmission pump might start failing
• Non observance of the drive motor generator power inverter control module
• Transmission control module failure
• Some issues with the car wiring