The clutch pressure control (PC) solenoid 3 is part of the control solenoid (w/body and TCM) valve assembly. The control solenoid (w/body and TCM) valve assembly has no serviceable parts. The clutch PC solenoid 3 is a normally high-pressure control solenoid which provides fluid pressure to the low and reverse/4-5-6 clutch regulator valve which regulates the transmission fluid pressure to the low and reverse/4-5-6 clutch. The transmission control module (TCM) controls the solenoid pressure by regulating the exhaust fluid. When the TCM commands the solenoid off, the exhausting fluid is stopped and the low and reverse/4-5-6 pressure is high. When commanded on, the clutch PC solenoid 3 regulates the amount of exhausting transmission fluid. Solenoid power is supplied by the TCM through a high side driver (HSD). The HSD protects the circuits and components that the TCM powers. Should the circuit overload the driver will shutdown. After the overload is removed the HSD resets. The TCM calculates gear ratio based on data from the automatic transmission input speed sensor (ISS) and the output speed sensor (OSS). The TCM compares the known transmission gear ratio to a calculated gear ratio for each commanded gear.

P0796

P0797

P0796

The TCM detects an incorrect on-coming clutch gear ratio, or flare, when the low and reverse/4-5-6 clutch is commanded ON for 6.0 seconds and the transmission input shaft speed is 33 RPM or greater from the anticipated input shaft speed for 4.0 seconds.

P0797

The TCM detects an incorrect off-going clutch gear ratio, or tie-up, when the low and reverse/4-5-6 clutch is commanded OFF for 1.0 seconds and the transmission input shaft speed is 33 RPM or less from the anticipated input shaft speed for 1.0 second.

DTCs P0796 and P0797 are Type A DTCs.

Schematic Reference

Description and Operation

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

1. Perform the Transmission Fluid Check to verify correct fluid level and condition. The transmission fluid level should be within the crosshatch band and the transmission fluid should be red or dark brown.

⇒	If the transmission fluid is low or discolored, refer to Transmission Fluid Replacement.

2. Engine idling at operating temperature. Attempt to clean or free up a potential sticking valve with the scan tool Service Cleaning Procedure. Refer to Control Solenoid Valve and Transmission Control Module Assembly Cleaning for further instructions.
3. Operate the vehicle in DRIVE with the calculated throttle position greater than 15 percent to obtain 72 km/h (45 mph) and achieve 5th gear. Perform this maneuver 2 times. The DTCs should not set.
4. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

1. Ignition OFF, remove the line pressure test hole plug and install the J 21867 to the transmission.
2. Perform the Line Pressure Check. Verify the transmission line pressure gage is within the range specified in the Line PC Solenoid Valve Pressure table. Refer to Solenoid Valve Pressure.

⇒	If not within the specified range, repair as necessary. Refer to Fluid Pressure High or Low for further diagnosis.

3. Ignition OFF, remove the control solenoid (w/body and TCM) valve assembly.
4. Install the DT-48616 to the control solenoid (w/body and TCM) valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test for detailed instructions.
5. Perform the Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test. A pressure change should occur.

⇒	If a pressure change does not occur, replace the control solenoid (w/body and TCM) valve assembly.

6. Inspect for the following conditions and repair/replace as necessary:

•	The control valve lower body assembly for sticking valves, damage, scored bores, or debris

•	The low and reverse/4-5-6 clutch assembly for damage

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.