Transmission Control System

CODE NUMBER
Scan tool: 42
General scan tool: P0755

CODE NAME
Solenoid circuit error: 2-4

CODE DESCRIPTION
Technical Description
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 code being set.

Check Area/Set Conditions
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. All four solenoids are tested for continuity continuously during vehicle operation. For solenoids that are currently energized, power is momentarily interrupted, then reenergized. For solenoids that are not currently energized the solenoid is momentarily energized, then deenergized. 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.

Transmission Effects
Transmission goes into neutral if code is set above 35 km/h (22 mph), limp-in mode when vehicle speed is below 35 km/h (22 mph).

PROBABLE CAUSE
- Malfunction of solenoid and pressure switch assembly
- Harness or connector between 2-4 solenoid and TCM open or short-circuited
- TCM ground open-circuited
- Malfunction of TCM





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