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Home >> Chevrolet >> 2014 >> Tahoe LS, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Data Communication System >> Diagnostic Information and Procedures >> DTC U1878: Drive Motor B Control Module Lost Communication With Battery Energy Control Module >> Diagnostic Fault Information
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Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
BECM B+ (circuit 4240) U0146* in PSCM U1878* in HPCM, U0111 in SDGM - -
BECM Ground (circuit 2751) - U1878* in HPCM, U0111 in SDGM - -
BECM Communication Enable Signal (circuit 5986) U1878* in HPCM, U2099 in BCM U1878* in HPCM, U0111 in SDGM - -
HSGMLAN + (circuit 2500) 1* U1878* in HPCM, U0111 in SDGM 1* -
HSGMLAN - (circuit 2501) 1* U1878* in HPCM, U0111 in SDGM 1* -
HPCM Ignition (circuit 2139) P2534 P2534 U1875* in HPCM, B1453 in SDGM -
* Other modules/DTCs will set with this fault.
1. Scan tool does not communicate with high speed GMLAN device.
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