DTC Troubleshooting

DTC Troubleshooting: P0777 (77-4)

DTC P0777:

A/T Clutch Pressure Control Solenoid Valve B Stuck ON

NOTE:

- Before you troubleshoot, record all freeze data and any on-board snapshot with the HDS, and review the General Troubleshooting Information How to Troubleshoot the A/T System.
- If DTC P0777 is stored in the PCM, the transmission does not shift to any gear other than 3rd or 6th gear because of the fail-safe function.

1. Warm up the engine to normal operating temperature (the radiator fan comes on).

2. Make sure that the transmission is filled to the proper level, and check for fluid leaks.

3. Drain the ATF ATF Replacement through a strainer. Inspect the strainer for metal debris or excessive clutch material.

Does the strainer have metal debris or excessive clutch material?

YES -

Replace the transmission.

NO -

Replace the ATF ATF Replacement, then go to step 4.

4. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

5. Clear the DTC with the HDS.

6. Start the engine.

7. With the brake pedal pressed, shift to D, and check the 3rd Pressure Switch signal and the 6th Pressure Switch signal with the HDS in the A/T Data List.

Does the 6th Pressure Switch turn on momentarily, then does the 3rd Pressure Switch turn on with a harsh shift?

YES -

Faulty A/T clutch pressure control solenoid valve B. Replace the secondary valve body (A/T clutch control solenoid valve B) Secondary Valve Body Replacement.

NO -

Intermittent failure, the system is OK at this time.