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 128 (ENGINE CONTROLS - TESTS W/CODES - 3.8L)TROUBLE CODE CHARTSCODE 1623, PROM ERROR
1995 GMC Suburban K2500, 6.5 F
Code 1623, Prom Error
1995 GMC Suburban K2500, 6.5 FSECTION Code 1623, Prom Error
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.
Check that PROM is correctly inserted in socket. If okay, replace PROM, clear memory and recheck. If Code P1623 reappears, replace control module.
NOTE:
To prevent possible electrostatic discharge damage to control module or PROM, DO NOT
touch component leads. DO NOT
remove integrated circuit from carrier.
RENDER: 1.0x
NO RELATED
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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.