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 MANUALSCHEVROLET1994LUMINA BASEREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - 3.4LECM/PCM CODE CHARTSCODE P1623, PROM ERROR
1994 Chevrolet Lumina Base
Code P1623, Prom Error
1994 Chevrolet Lumina BaseSECTION Code P1623, Prom Error
Check that PROM is correctly inserted in socket. If okay, replace PROM, clear memory and recheck. If Code P1623 reappears, replace PCM.
NOTE:
To prevent possible electrostatic discharge damage to PCM 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.