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 MANUALSGMC1995SUBURBAN K2500, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 129 (ENGINE CONTROLS - BASIC TESTING - 3.8L)DIAGNOSTIC CIRCUIT CHECKA-2, MIL ALWAYS ON STEADY
1995 GMC Suburban K2500, 6.5 F
A-2, Mil Always On Steady
1995 GMC Suburban K2500, 6.5 FSECTION A-2, Mil Always On Steady
WARNING: This page is about a different car, the 1995 Pontiac Trans Sport, 1995 Oldsmobile Silhouette, and 1995 Chevrolet Lumina APV. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF. Disconnect PCM connectors. Ignition ON. MIL (Service Engine Soon) should be OFF. If MIL is not OFF repair the short to ground in circuit 419 or faulty IPC. If MIL is OFF go to step 2).
- Check PROM for proper installation. If OK, replace PCM using original PROM. Ignition OFF, install Tech 1. Reconnect PCM and turn ignition ON. Select MISC. TESTS, DASH LAMPS with TECH 1 and turn MIL OFF. MIL (Service Engine Soon) should turn OFF. If MIL is OFF the system is OK. If MIL is ON replace PROM.
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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.