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.
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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 229 (CRUISE CONTROL SYSTEM)SYSTEM TESTSTEST D: CRUISE CONTROL INOPERATIVE/MALFUNCTIONING USING CRUISE CONTROL TESTER (J 42958)PCM INHIBIT
1999 GMC Forward Control 5.7 R, Automatic
PCM Inhibit
1999 GMC Forward Control 5.7 R, AutomaticSECTION PCM Inhibit
WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
The PCM will inhibit (not allow) cruise control if one or more of the following has occurred:
- When Park, Reverse, Neutral, or 1st gear is indicated.
- When certain Diagnostic Trouble Codes (DTC) are stored.
- When an over/undercharged battery condition exists.
- With low engine RPM.
- With high engine RPM (Fuel Cut-Off).
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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.