TCM - (Transmission Control Module)

P0748

Solenoid Lock-Up. Short to Ground.

Solenoid Lock-Up. Open Circuit / Short to B+.







Fault symptoms
CHECK GEARBOX warning lamp on.
TCM in limp-home mode.

Conditions
Shorting to Ground/Open circuit.
Shorting to B+.
Solenoid shorted.

Diagnostic help
The status of the pressure control solenoid can be ascertained with the diagnostics instrument.
The pressure control solenoid regulates the transmission's system pressure.
The pressure control solenoid can be activated with the diagnostics instrument.

- Select "Data Display / Output Control (New)" and "Solenoid Pressure Regulation

Check the wiring
Jiggle the wiring harness at several points and in different directions to reveal intermittent breaks and short circuits in the various leads. Observe the multimeter, test lamp or diagnostic instrument while carrying out this check.