P1923
Read the instructions below then
start the fault diagnostic procedure.
Symptom: No bus communication with TCM
No bus communication with TCM. See fault diagnosis 3:5 Bus and diagnostics function.
Fault symptoms
No bus communication with TCM
Condition
The following conditions are applicable:
Trionic:
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•
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The TCM has been present on the bus at some time previously
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No communication for 3 seconds.
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Diagnostic help
Some of the following symptoms can
perhaps
be observed:
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Diagnostic trouble code P1921 or P1902 in TCM (if the TCM can be contacted)
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Additional diagnostic trouble codes in the Trionic (P1901, P1902 or P1908).
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Automatic transmission in Limp-Home mode (CHECK ENGINE lamp on).
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Checking the 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.
