Conditions

Gear Selector Position Sensor, Control Module Inputs Faulty Or Absent. Shift-lock Relay Faulty
Fault symptoms
CHECK GEARBOX warning lamp on.

TCM in Limp-Home mode.

Conditions
Impermissible combination of the selector lever position sensor's voltage inputs to the TCM.

Diagnostic help
The diagnostics instrument can be used to obtain readings of the selector lever position sensor's voltage inputs.

The diagnostics instrument shows the status of all voltage inputs, ON (B+) and OFF (ground).

If the selector lever position sensor is found to be faulty, it could be caused by a short circuit in the wiring harness. Before replacing the sensor, check the wiring harness for shorting to ground.

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.