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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 323 (Data Communication System - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC U18A7: Lost Communication with Power Supply Transformer on Powertrain Expansion CAN Bus >> Diagnostic Fault Information

Diagnostic Fault Information

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
B+ U18A7 U18A7 - -
Ignition U18A7 U18A7 - -
Serial Data Communication Enable U1814, U2099 U18A7 - -
Powertrain High Speed GMLAN Serial Data (+) U0074* U0074, U18A7* U0074* -
Powertrain High Speed GMLAN Serial Data (-) U0074* U0074, U18A7* U0074* -
Ground - U18A7 - -
* Other DTCs may set with this fault.
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