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Home >> Buick >> 2021 >> Enclave Preferred >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Electronic Transmission Range Select System >> Diagnostic Information and Procedures >> DTC P1787 >> 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 K71 Transmission Control Module to engage the selected gear.

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