P1623

P1623 00

TCM Missing on BUS







Fault symptom
Check Engine
Messages shown in SID.
Limp home

On-board diagnosis

Type of diagnosis:
Continuous

Enable criteria:
Ignition on for at least 3 s.
Battery voltage must be between 6 - 18 V.

Fault criteria:
No communication with TCM for 1.25 s.

Dependent
P0600

System reaction to a fault:
Torque limited to max. 170 Nm.

OK report:
Fault criteria NOT fulfilled for 2 s.

Fault handling:
CHECK ENGINE off and any DTC are immediately cleared as soon as TCM no longer requests CHECK ENGINE.

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
Fault diagnosis for automatic transmission (TCM) should be carried out.

See bus fault diagnosis.