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.
Pinpoint Test G: Flash Code 2 - STOPLAMP Switch Circuit Failure
- G1 CHECK THE STOPLAMP OPERATION
- Apply and release the brake pedal while observing the stoplamps.
- Do the stoplamps operate correctly?
Yes : GO to G2.
No : REFER to EXTERIOR LIGHTING to continue diagnosis of the stoplamps.
- G2 CHECK THE STOPLAMP BULBS
- Check the stoplamps for the presence of aftermarket LED lights.
- Are the correct stoplamp bulbs installed?
Yes : GO to G3.
No : INSTALL the correct stoplamp bulbs. TEST the system for normal operation.
- G3 CHECK CIRCUIT 511 (LG) FOR AN OPEN
- Disconnect: Speed Control Actuator C122.
- While applying the brake pedal, measure the voltage between the speed control actuator C122-4, circuit 511 (LG), harness side and ground.
- Is the voltage greater than 10 volts?
Yes : INSTALL a new speed control actuator. REFER to SPEED CONTROL ACTUATOR in this article. REPEAT the self-test.
No : REPAIR the circuit. REPEAT the self-test.
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.