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.
Diagnostic Test - Electric Vehicle Control Unit (EVCU) Internal Faults
TECH TIPS:
- Refer to the ECVU Verification Test information at the bottom of the test procedure to determine any routines or procedures that must be performed for the system to operate correctly after repairs are made.
EVCU internal faults (P0601, P0603, P0604, P0605, P060B, P060C, P062F, P16F3, P16F5 & P16F9):
The EVCU does a self test to verify there are no internal issues.
- Verify there are no low voltage or overcharging DTCs present.
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If DTCs are present diagnose them before proceeding to the next step
- If no DTCs are present, continue to step 2
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- Replace the EVCU in accordance with the service information.
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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.