P0748

Read the instructions below then start the fault diagnostic procedure.

Symptom: CHECK GEARBOX warning lamp on. TCM in limp-home mode.

P0748

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.