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P1921

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

P1921

No bus data from ECM.


Fault symptoms

CHECK GEARBOX warning lamp is on.

TCM in Limp-Home mode.

Conditions

TCM has been in contact with ECM at some time since ignition on.

Fault criteria

If bus communication between ECM and TCM has been missing for more than 4s, DTC P1921 will be generated

Diagnostic help

See fault diagnosis for Bus and diagnostic communication