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.
Normal Operation
When the speed control actuator carries out the self-test, a voltage signal is sent through circuit 511 (LG). Circuit 511 (LG) carries the signal to the stoplamp bulbs, which then is routed to ground. If the signal fails to be grounded, flash code 2 is set by the speed control actuator.
Possible Causes
- Circuit 511 (LG) open
- Stoplamp bulbs
- Stoplamp switch
- Speed control actuator
NO RELATED
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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.