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Home >> Buick >> 2016 >> Regal GS, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Data Communication System - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC U1818: Lost Communication with Engine Control Module on Powertrain Expansion CAN Bus Malfunction >> Diagnostic Fault Information
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Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
B+ U1818 U1818 - -
Ignition U1814, U1818 U1818 - -
Powertrain High Speed GMLAN Serial Data (+) U0074* U0074, U1818* U0074* -
Powertrain High Speed GMLAN Serial Data (-) U0074* U0074, U1818* U0074* -
Ground - U1818 - -
* Other DTCs may set with this fault.
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