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Home >> Cadillac >> 2014 >> Escalade Base, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Data Communication System >> Diagnostic Information and Procedures >> DTC U1815: Lost Communication With Drive Motor Control Module "A" on Bus "B" >> Diagnostic Fault Information
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Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
B+ 1 U1815/U1816 - -
B+ 1 U1815/U1816 - -
Ignition 1 U1815/U1816 - -
Module Ground Strap - U1815/U1816 1 -
High Speed hybrid GMLAN Serial Data (+) U0074 U1815/U1816 U0074 -
High Speed hybrid GMLAN Serial Data (-) U0074 U1815/U1816 U0074 -
Hybrid Module Wake-up Signal B137A U1815/U1816 - -
1. Multiple symptoms may occur due to open fuses.