The following fault table will help determine if a hydraulic circuit or an incorrect position of a valve train component affects the transmission operation.

The clutch pressure control (PC) solenoid 2 is integral to the control solenoid (w/body and TCM) valve assembly and has no serviceable parts. The PC solenoid 2 is a normally high-pressure control solenoid which provides fluid pressure to the 3-5-R clutch regulator valve. The TCM controls the solenoid pressure by regulating the exhaust fluid. When the TCM commands the solenoid off, the exhausting fluid is stopped and the 3-5-R pressure is high. When commanded on, the clutch PC solenoid 2 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 reset.

P0776

P0777

P0776

The TCM detects an incorrect on-coming clutch gear ratio, or flare, when the 3-5-R clutch is commanded On for 2.25 seconds and the transmission input shaft speed is greater than 60 to 100 RPM from the anticipated input shaft speed.

P0777

The TCM detects an incorrect off-going clutch gear ratio, or tie-up, when the 3-5-R clutch is commanded Off for 1.2 seconds and the transmission input shaft speed is greater than 40 RPM from the anticipated input shaft speed.

DTCs P0776 and P0777 are Type A DTCs.

Schematic Reference

Description and Operation

Transmission Component and System Description

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

DT-47825 Control Solenoid Test Plate

1. Perform the Transmission Fluid Check . The fluid must be full and in good condition.
2. Start engine in park and wait a moment. Shift to Reverse, pause, and then shift to Drive (D6) without allowing the vehicle to move.
3. View scan tool parameters Commanded Gear and Gear Ratio.
4. Operate the vehicle in drive from a complete stop, with the calculated throttle position greater than 15 percent to obtain 56 km/h (35 mph) or more.
5. Make certain 3rd, 5th and Reverse gears are attainable. Use the two scan tool parameters and refer to the Shift Solenoid Valve State and Gear Ratio table to verify the correct ratio for the commanded gear.

⇒	If the DTC resets, go to Circuit/System Testing.

1. Perform the Line Pressure Check .

⇒	If the pressure is out of specification, correct this concern first.

2. Perform the Control Solenoid Valve and Transmission Control Module Assembly Cleaning and retest the DTC as outlined in the Circuit/System Verification steps.

⇒	If the DTC resets, continue with testing.

3. Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection .

⇒	If a concern is found, repair or replace the control solenoid (w/body and TCM) valve assembly.

4. Perform the Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test .

⇒	If the solenoid is found to be leaking or stuck closed, replace the control solenoid (w/body and TCM) valve assembly.

5. Inspect the control valve upper body assembly for sticking valves, damage, scored bores, or debris.

⇒	If a concern if found in the valve body, repair or replace the valve body as necessary.

6. Inspect the 3-5-R clutch assembly for damage.

⇒	If a concern is found in the 3-5-R clutch assembly, repair or replace as necessary.

Operating the transmission in the following condition will verify the PC solenoid or a portion of the hydraulic control circuit is not functioning as it should.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.