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)SELF-DIAGNOSTIC SYSTEMCLEARING DIAGNOSTIC TROUBLE CODESNOTES
1999 GMC Forward Control 5.7 R, Automatic
Clearing Diagnostic Trouble Codes: Notes
1999 GMC Forward Control 5.7 R, AutomaticSECTION Notes
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.
NOTE:
Manufacturer does not recommend disconnecting the battery to clear Powertrain Control Module (PCM) memory. Disconnecting battery may or may not clear PCM memory, but other memory system memories will be cleared. On many OBD-II systems, PCM will retain memory for an extended period of time even with battery disconnected.
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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.