P0797 Code - Pressure Control Solenoid 'C' Stuck On

What does P0797 Mean?

OBD-II Code Transmission may not shift properly is defined as a Pressure Control Solenoid "C" Stuck On

The Transmission Control Module (TCM) uses Pressure Control Solenoids to control the hydraulic pressure in the transmission which is needed to apply the various clutch packs in the transmission that provide the different gear ratios needed to efficiently propel the vehicle down the road. When the TCM detects a pressure control solenoid is not performing as desired, it will set code P0797.

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What are the common causes of P0797 ?

• Defective ECU strategies or components will prevent proper regeneration
• The Mass Airflow sensor is a hot wire that senses the volume of air entering the intake manifold. The computer uses this information to control fuel mixture.
• Faulty IMRC actuator/sensor

How do you troubleshoot P0797 ?

To repair a P0797 trouble code, the mechanic needs to take the following steps:

• If damaged, rebuild the transmission and install a new torque converter
• Flush the transmission fluid once rebuilt
• The mechanic should also repair any detected leaks
• Replace any damaged, burnt, or faulty wiring, connectors, or components
• Replace the hydraulic pump if it is not working properly. This requires the mechanic to remove and partially disassemble the transmission
• Replace the electronic pressure control solenoid and any related wiring, connectors, or components if found to be faulty
• Replace the PCM if it is bad

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