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Home >> Cadillac >> 2016 >> ELR >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Data Communication System - DTC B1000 To DTC U183B >> Diagnostic Information and Procedures >> DTC U1839: Auxiliary Transmission Fluid Pump 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+ U1839 U1839 - -
Ignition U1839 U1839 - -
Accessory Wake Up Serial Data 2 P06E4* U1839* - -
High Speed GMLAN Serial Data (+) U0073* U0073, U1839* U0073* -
High Speed GMLAN Serial Data (-) U0073* U0073, U1839* U0073* -
Powertrain High Speed GMLAN Serial Data (+) U0074* U0074, U1839* U0074* -
Powertrain High Speed GMLAN Serial Data (-) U0074* U0074, U1839* U0074* -
Ground - U1839 - -
* Other DTCs may set with this fault and multiple symptoms including a no start condition may occur.
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