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.
Possible Causes
| Possible Causes |
|---|
| DEALER INSTALLED EQUIPMENT |
| ECU POWER SUPPLY (FUSED B+/IGNITION) RELATED CIRCUIT(S) OPEN CIRCUIT, SHORTED TO GROUND OR ANOTHER CIRCUIT |
| ECU GROUND CIRCUIT(S) OPEN/HIGH RESISTANCE |
| ECU CAN BUS CIRCUIT(+/-) OPEN/HIGH RESISTANCE, SHORTED TO GROUND, TOGETHER, VOLTAGE, OR ANOTHER CIRCUIT |
| STAR CONNECTOR (IF EQUIPPED) |
| ECU |
Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.
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