TCM T8 / P0721 08

Read the instructions below then start the fault diagnostic procedure.

Symptom: Message appears in display.

P0721 08

Fault symptom

Message appears in display.

On-board diagnosis

Type of diagnosis:

Continuous

Enable criteria:

Engine running and not in limp home mode.

Exceptions:

Reverse gear engaged.

2nd or 3rd gear engaged.

Fault criteria:

Control module receives no voltage from the output speed sensor.

Control module receives no value from output speed sensor but receives value from the input speed sensor.

System reaction to a fault:

Control module uses speed value from the ABS system instead of the output speed sensor.

If the DTC remains during several test cycles:

Limp home

Checking the wiring harness

Move the wiring harness at several spots and in several directions to reveal intermittent breaks and short-circuits. Check switches, connectors and crimp connections for oxidation, retracted pins and pin clamping force.

Diagnostic help

Diagnosis regards:

Electrical fault in connecting leads or component.