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 Verification
DTC C1111 will set as result of brake fluid pressure hold solenoid relay circuit short to voltage or open/short to ground, test for power, and ground circuits to the SGCM. These electrical failures will typically be set immediately after key-up.
- Test and repair the SGCM power or ground circuits if necessary.
DTC C1111 will set as result of the circuit voltage is too high. These will be set approximately 1 seconds or more after start-up, and may be intermittent.
- Locate and repair the source of the circuit fault. Refer to Brake Assist System Diagnosis .
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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.