$41 (P0750) & $42 (P0755) & $43 (P0760) & $44 (P0765)

Name of code:
$41 (P0750) - L-R Solenoid Circuit
$42 (P0755) - 2-4 Solenoid Circuit
$43 (P0760) - OD Solenoid Circuit
$44 (P0765) - UD Solenoid Circuit

When monitored: Ignition key is turned from "off" position to "run" position and/or ignition key is turned from "crank" position to "run" position, then every 10 seconds thereafter, or when a speed ratio or pressure switch error fault is detected.

Set condition: All four solenoids are tested for continuity continuously during vehicle operation. For solenoids that are currently energized, power is momentarily interrupted, then re-energized. For solenoids that are not currently energized, the solenoid is momentarily energized, then de-energized. Under both situations, if an inductive spike is not sensed by the Transmission Control Module (TCM) during the continuity check, it is retested twice. If it fails the test the third time, the appropriate code is set.

Theory of operation: Four solenoids are used to control the friction elements (clutches). The continuity of the solenoids circuits are periodically tested. Each solenoid is turned on or off depending on it's current state. An inductive spike should be detected by the TCM during this test. If no spike is detected, the circuit is tested again to verify the failure. In addition to the periodic testing, the solenoid circuits are tested if a speed ratio or pressure switch error occurs. In this case, one failure will result in the appropriate code being set.

Transmission Effects: The M I L will illuminate and the transmission system will go into relay open limp-in mode.

Possible causes:
- Open or shorted solenoid circuit(s) between TCM and solenoid pack.
- Open ground circuit.
- TCM connector problems.
- Solenoid pack connector problem.
- Defective solenoid pack.
- Defective TCM