DTC Troubleshooting: P0777 (77-4)

DTC P0777:  A/T Clutch Pressure Control Solenoid Valve B Stuck ON

NOTE: Record all freeze data and review General Troubleshooting Information before you troubleshoot.

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

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

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

Does the strainer contain metal debris or excessive clutch material?


YES - Replace the transmission.n


NO - Replace the ATF, then go to 4.


4.Clear the DTC with the HDS.

5.Test-drive the vehicle in the D position in all five gears at speeds over 20 km/h (12 mph) for more than 20 seconds, then slow down to a stop.

6.Retest-drive the vehicle in the D position in all five gears at speeds over 20 km/h (12 mph) for more than 20 seconds, then slow down to a stop.

7.Check the OBD status in DTC Monitor Tool from DTCs/Freeze Data in A/T Mode Menu for a pass/fail test of code P0777.

Did the result indicate a fail?


YES - Go to 8.


NO - Intermittent failure, the system is OK at this time. If the tester indicates NOT COMPLETE, return to 5 and recheck.n

8.Clear the DTC with the HDS.

9.Choose Clutch Pressure Control (Linear) Solenoid B in Miscellaneous Test Menu, and test the A/T clutch pressure control solenoid valve B with the HDS.

Is the system OK?


YES - Intermittent failure, the system is OK at this time. If the tester indicates NOT COMPLETE, return to 9 and recheck.n


NO - Follow instructions indicated on the HDS by the test result, but the tester has not determined the cause of the failure, go to 10. If any part was replaced, go to 11.


10.Inspect A/T clutch pressure control solenoid valve B.

Does the A/T clutch pressure control solenoid valve B work properly?


YES - Repair hydraulic system related with shift valve B, or replace the transmission, then go to 11.


NO - Replace A/T clutch pressure control solenoid valve B, then go to 11.


11.Clear the DTC with the HDS.

12.Test-drive the vehicle in the D position in all five gears at speeds over 20 km/h (12 mph) for more than 20 seconds, then slow down to a stop.

13.Retest-drive the vehicle in the D position in all five gears at speeds over 20 km/h (12 mph) for more than 20 seconds, then slow down to a stop.

14.Check the OBD status in DTC Monitor Tool from DTCs/Freeze Data in A/T Mode Menu for a pass/fail test of code P0777.

Did the result indicate a pass?


YES - The problem has been corrected.n


NO - Return to 8 and recheck.n