P1623
Read the instructions below then
start the fault diagnostic procedure.
Symptom: No bus communication with TCM.
No Bus Data From TCM
Fault symptoms
No bus communication with TCM.
Conditions
The following conditions apply:
Trionic:
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TCM has previously been present on the bus at some time.
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No communication for 3 seconds
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Diagnostic help
Some of the following symptoms may be observed:
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DTC P1921 in TCM (if TCM can be contacted).
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Additional DTCs in Trionic (P1622).
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Automatic transmission in limp-home (CHECK GEARBOX on)
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Check wiring harness.
Jiggle the wiring harness at several points and in different directions to detect intermittent breaks and short-circuits in the leads. Observe the multimeter, test lamp or diagnostic tool during the test.
