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Home >> GMC >> 2018 >> Terrain SL >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> Data Communication System - Diagnostic Information And Procedures (U183A To U3012) And Symptoms >> Diagnostic Information And Procedures >> DTC U18AA: Transmission Range Control Module Lost Communication With Engine Control Module >> Diagnostic Fault Information
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Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
B+ U18AA U18AA - -
Ignition U18AA U18AA - -
Accessory Wakeup Serial Data U1814, U2099 U18AA - -
High Speed GMLAN Serial Data (+) U0073* U0073, U18AA* U0073* -
High Speed GMLAN Serial Data (-) U0073* U0073, U18AA* U0073* -
Ground - U18AA - -
* Other DTCs may set with this fault.
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