P179B BUICK - Range State Command Circuit
- Faulty Transmission Control Module (TCM)
- Transmission Control Module (TCM) harness is open or shorted
- Transmission Control Module (TCM) circuit poor electrical connection
- Engine Light ON (or Service Engine Soon Warning Light)
P179b Buick DescriptionThis is an internal fault detection of the Transmission Control Module (TCM). The transmission control module is part of the control solenoid valve assembly, and is not serviced separately. This fault is handled inside the transmission control module and no external circuits are involved.
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