P2796 OBD Error Code: Problem & Solutions

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The trouble code P2796 can be defined as Auxiliary Transmission Fluid Pump Control Circuit/Open. The auxiliary transmission fluid pump control circuit is being monitored by the engine control module. This trouble code would be set by the ECM when the auxiliary transmission fluid pump control circuit would not be as per the specifications set by the manufacturer.

The fluid is pressurized in the transmission with the help of auxiliary transmission fluid pump. Now if the pump would not operate as per the request, then P2796 error code would start flashing. The engine control module, powertrain control module or the transmission control module monitors this circuit depending upon the particular automobile.

What causes this problem with the Auxiliary Transmission Fluid Pump Control Circuit/Open?

• Malfunctioning electronic transmission fluid auxiliary pump
• Electronic transmission fluid auxiliary pump harness might be open or little
• Faulty drive motor generator power inverter control module failure
• Malfunctioning transmission fluid pump control relay

1. Transmission Fluid Pump - If the transmission fluid pump fails, the fluid of the pump will not be able to circulate in the transmission and the driver may smell the fuel burning. Thus, it might need immediate replacement.
2. 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!
3. 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.
4. 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.
5. Transmission Fluid Pump Harness - Damaged pump harness can lead to problematic transmission performance and can cause transmission slipping, rough shifts, fuel leakages and delayed engagements. Buy new fluid pump harness now!
6. 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!
7. Diagnostic Tool - Make use of quality diagnostic tools to resolve any OBD error code. Buy quality diagnostic tools from us!

Willing to know some common symptoms of OBD Trouble Code P2796? Your wish is our demand. Have a look at them below:

Common Symptoms

• Visibility in the check engine light
• Transmission might start overheating
• Decreased 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 P2796:

• You must fix the defective transmission fluid pump control relay
• Make sure to mend the faulty electronic transmission fluid auxiliary pump
• It is essential to restore the flawed electronic transmission fluid auxiliary pump harness
• Repair or replace the quirky drive motor generator power inverter control module
• Rehabilitate the defaults in the powertrain control module 

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

• There are 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 P2796 Code

• Common mistakes while diagnosing this trouble code are unnecessary and expensive replacements which usually happens when one doesn't follow all the steps carefully.
• The most common mistake while diagnosing this code is missing out on diagnosing steps which further leads to the expensive and unnecessary replacements. It is always recommended to seek the help of experienced diagnostician to avoid any mistakes.