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Home >> Chevrolet >> 2014 >> Tahoe PPV >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Data Communication System >> Diagnostic Information and Procedures >> DTC U189A: DC to DC Converter Control Module A Lost Communication With Hybrid Powertrain Control Module >> Diagnostic Fault Information
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Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
PTLAN +
2 circuits at PIM		 U0074* U189A* U0074* -
PTLAN -
2 circuits at PIM		 U0074* U189A* U0074* -
Wake Up Signal
circuit 968		 B137A* in SDGM U189A* ** 1 -
Wake Up Signal
circuit 932		 B137B* U182A* U189A* -
Wake Up Signal
Circuit 5985		 U1814* in BCM U1812* in HPCM U209A* in SDGM -
* Other modules/DTCs will set with this fault.
** Open at SDGM or BECM will set DTC U1812 in HPCM. Open at PIM will set DTC U189A in the HPCM.
1. Parasitic drain on battery, and may set DTC U1875, U1876, U1878, U1879 as history in the HPCM with the key ON, or as current with the key OFF.
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