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Home >> Buick >> 2017 >> LaCrosse Base >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Automatic Transmission Range Select Lever >> Diagnostic Information and Procedures >> DTC P1787 or P17C8: Unexpected Range Change/Transmission Range Control Module Range Motor >> Conditions for Setting the DTC

Conditions for Setting the DTC

P1787 

The actual transmission range does not equal the requested transmission range, without the driver requesting a range change.

P17C8 

The device has detected an internal malfunction.

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