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Home >> Buick >> 2017 >> LaCrosse Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Data Communication System - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC U18AC: Transmission Range Control Module Lost Communication with Chassis Control Module on Chassis Expansion CAN Bus >> Diagnostic Fault Information
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Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
B+ U18AC U18AC - -
Ignition U18AC U18AC - -
Accessory Wakeup Serial Data U1814, U2099 U18AC - -
Chassis High Speed GMLAN Serial Data (+) U0077* U0077, U18AC* U0077* -
Chassis High Speed GMLAN Serial Data (-) U0077* U0077, U18AC* U0077* -
Ground - U18AC - -
* Other DTCs may set with this fault.
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