P1804

P1804 00

TCM Was Missing On Bus







Fault symptom
Messages shown in SID.

On-board diagnosis

Type of diagnosis:
Continuous

Enable criteria:
Engine running and not in limp home mode.
Voltage is over 9 V but under 16 V

Fault criteria:
No bus communication.

System reaction to a fault:
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
In order to read DTC from Trionic TCM, communication with CIM is required. If the DTC is stored and read with the diagnostic instrument, it indicates intermittent bus-lead fault.