P1901
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Some of the following symptoms may perhaps be observed:
Diagnostic trouble code P1921 or P1902 in the TCM.
Additional diagnostic trouble codes in Trionic (P1902, P1923 or P1908).
A/C not working.
Radiator fan runs continuously or not at all (coolant may boil).
Radio does not work.
Direction indicators do not work.
Interior lighting does not work.
Intermittent wiper operation does not work.
No Bus Data From DICE. See Fault Tracing 3:5 Bus and Diagnostic Communication.
Fault symptoms
Some of the following symptoms may perhaps be observed:
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Diagnostic trouble code P1921 or P1902 in the TCM.
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Additional diagnostic trouble codes in Trionic (P1902, P1923 or P1908).
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Radiator fan runs continuously or not at all (coolant may boil).
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Direction indicators do not work.
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Interior lighting does not work.
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Intermittent wiper operation does not work.
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Conditions
The following conditions apply for this DTC:
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Engine running and no communication for more than 10 seconds.
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Diagnostic help
Fault diagnosis concerns intermittent electrical faults in the power supply for the sending control module or in a bus lead.
Check the wiring
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Note
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Jiggle the leads and in-line connectors at various points and in different directions to detect any intermittent breaks or short circuits in the wiring. Observe the multimeter, test lamp or diagnostic tool while doing this.
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