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Escalade ESV Base, AWD
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DTC U1815: Lost Communication With Drive Motor Control Module "A" on Bus "B"
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Diagnostic Aids
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Diagnostic Aids
DTC U1815 can set current in the HPCM, ECM, and the SDGM.
If DTC U1815 is only set in the HPCM, the PIM must be replaced due to all circuits between the HPCM and MCM being internal to the PIM.