Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Circuit/System Description
The accessory DC power control module supplies the energy that flows between the high voltage, 300 volt, DC and intermediate voltage, 42 volt, DC to support the electric power steering. The accessory DC power control module receives a 42 volt enable command from the hybrid powertrain control module over serial data. 42 volt accessory DC power module functions will run only when the 42 volt accessory DC power control module enable is active through serial data.
The accessory DC power control module continuously monitors the status of its 42 volt circuitry. When the ignition key is first turned to RUN, some diagnostics are performed on this circuitry. When the engine is started, and the 42 V enable command is received by the accessory DC power control module, additional diagnostics are run.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.