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.
1999 GMC EnvoyFACTORY OEM SERVICE PROCEDURE
Without Scan Tool
- Turn ignition off. Replace failed/affected component.
- Turn ignition switch to RUN position, then to CRANK position (without starting engine), then back to RUN position.
- Observe SECURITY indicator light on dash for 10 minutes. After 10 minutes, indicator light will transition from on to off.
- Repeat steps 2) and 3) two more times. After successfully completing 3 consecutive cycles of ignition switch, vehicle will learn the new component on the next ignition cycle, which is from OFF to CRANK then to RUN position. Engine should start.
- After performing relearn procedures, clear DTCs. See RETRIEVING & CLEARING DTCS under SELF-DIAGNOSTICS.
Factory Service Tools
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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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