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Home >> Cadillac >> 2017 >> XT5 Platinum >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission Range Select System >> Diagnostic Information and Procedures >> DTC P1787 or P17C8: Unexpected Range Change Detected/Transmission Range Control Module Range Motor Command Performance - Protection Mode Active >> Circuit/System Description
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Circuit/System Description

The S3 Transmission Shift Lever will provide electrical signals based on customer input to the K38 Chassis Control Module, where the customer shift request will be determined. When the K38 Chassis Control Module receives the gear request signal from the S3 Transmission Shift Lever it sends the message for the K173 Transmission Range Control Module to engage the selected gear.

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