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P1921

Symptom: CHECK GEARBOX warning lamp is on. TCM in Limp-Home mode.

P1921

No Bus data From TRIONIC. See Fault Tracing 3:5 Bus and Diagnostic Communication.


Fault symptoms

CHECK GEARBOX warning lamp is on.

TCM in Limp-Home mode.

Conditions

This DTC is generated when diagnostic communication between Trionic and TCM ceases. This takes place when the speed exceeds 200 rpm and the fault has been present for more than 6 seconds.

Diagnostic help

The TCM goes into Limp-Home mode.

If Trionic is not present on the bus, the car will not start.

See Bus and diagnostics communication Other systems .