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 23 (ANALOG INSTRUMENT PANELS)SYSTEM TESTSTEST A: CHANGE ENGINE OIL MESSAGE ALWAYS ON
1999 GMC Forward Control 5.7 R, Automatic
Test A: Change Engine Oil Message Always On
1999 GMC Forward Control 5.7 R, AutomaticSECTION Test A: Change Engine Oil Message Always On
WARNING: This page is about a different car, the 2002 Chevrolet Monte Carlo, 2002 Chevrolet Impala, 2001 Chevrolet Monte Carlo, and 2001 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
- Perform instrument panel cluster system diagnostic system check. See INSTRUMENT PANEL CLUSTER SYSTEM DIAGNOSTIC SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM. If instrument panel cluster system diagnostic system check has been performed, go to next step.
- Start engine. If CHANGE ENGINE OIL message illuminates in instrument cluster message center, go to next step. If CHANGE ENGINE OIL message does not illuminate, check for intermittent problem. See DIAGNOSING INTERMITTENTS . Repair or replace as necessary. After repair, go to step 6 .
- Connect scan tool to Data Link Connector (DLC). Using scan tool, observe ENGINE OIL LIFE REMAINING parameter in PCM ENGINE data list. If scan tool displays zero percent, go to next step. If scan tool does not display zero percent, go to step 5 .
- Reset engine oil life system. See RESETTING ENGINE OIL LIFE SYSTEM under PROGRAMMING. If CHANGE ENGINE OIL message turns off, go to step 6 . If CHANGE ENGINE OIL message does not turn off, go to next step.
- Replace Instrument Panel Cluster (IPC). See INSTRUMENT PANEL CLUSTER (IPC) under REMOVAL & INSTALLATION. After repair, go to next step.
- Operate system to verify repair. If system operates normally, repair is complete. If system does not operate normally, return to step 2 .
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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.