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DTC U189A: DC to DC Converter Control Module A Lost Communication With Hybrid Powertrain Control Module
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Conditions for Setting the DTC
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Conditions for Setting the DTC
The HPCM does not receive voltage from the SDGM on the wake up signal circuit.
The wake up circuit between the SDGM and the APM is shorted to voltage.
Any of the 4 PTLAN circuits connected to the HPCM are open.