P0765 (C5) - UD Solenoid Circuit

Name of Code:
P0765 (C5) - UD Solenoid Circuit

When Monitored:
Initially at power-up, then every 10 seconds thereafter. They will also be tested immediately after a gear ratio or pressure switch error is detected.

Set Condition:
Three consecutive solenoid continuity test failures, or one failure if test is run in response to a gear ratio or pressure switch error.

Theory of Operation:
Six solenoids are used to control the friction elements (clutches). The continuity of the solenoid circuits are periodically tested. Each inactive solenoid is turned on for a few milliseconds, then off. Each active solenoid is turned off for a few milliseconds, then on. This pulsing of voltage to the solenoid causes an inductive spike which can be sensed by the TCM. If an inductive spike is not sensed by the Transmission Control Module (TCM) during the continuity check, it is tested again. If the test fails three consecutive times, the appropriate code is set. If the solenoid test is run in response to a gear ratio or pressure switch error, one failure will result in setting the appropriate code.

Transmission Effects:
The MIL will illuminate and the transmission system will default to the Immediate Shutdown routine.

Possible Causes:
- Open or shorted solenoid circuit (s) between TCM and Solenoid/TRS assembly.
- Open ground circuit.
- TCM connector problems.
- Solenoid/TRS connector problem.
- Solenoid/TRS assembly.
- TCM.