P1908
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Some of the following symptoms may be observed:
Additional trouble codes in TCM (P1902 or P1923).
Further DTCs in Trionic (P1901, P1902 or P1923).
Engine will not start.
Cruise control not working.
A/C malfunctioning.
Radiator fan runs continuously.
Main instrument unit gauges and indicators not working.
No Bus Data From MIU. See Fault Tracing 3:5 Bus and Diagnostic Communication.
Fault symptoms
Some of the following symptoms may be observed:
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Additional trouble codes in TCM (P1902 or P1923).
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Further DTCs in Trionic (P1901, P1902 or P1923).
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Cruise control not working.
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Radiator fan runs continuously.
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Main instrument unit gauges and indicators not working.
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Conditions
The following conditions apply for this DTC:
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Engine running and no communication for longer than 3 sec.
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Diagnostic help
Fault diagnosis concerns an intermittent electrical fault in the power supply to the transmitting control module or any of the bus leads.
Checking the wiring
Jiggle the wiring harness at several points and in different directions to detect intermittent breaks and short circuits. Observe the multimeter, diagnostic tool or test lamp during the check.
