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Home >> Chevrolet >> 2014 >> Express 1500 LS, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Data Communication System >> Diagnostic Information and Procedures >> DTC U0074: Control Module Powertrain Expansion Communication Bus >> Diagnostic Fault Information

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Powertrain High Speed GMLAN Serial Data (+) 1 U0100-U02FF* 1 -
Powertrain High Speed GMLAN Serial Data (-) 1 U0100-U02FF* 1 -
* No communications with one or more Powertrain high speed GMLAN control modules. An open in only one Powertrain high speed GMLAN serial data circuit may allow degraded communication between the control modules.
1. No Communication With Any Powertrain High Speed GMLAN Control Module