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 MANUALSBUICK1985SKYLARK CUSTOM, 2.5 R, STANDARD, MY8REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEM1.8L/2.5L TBI TESTS W/CODESCODE 55 - FAULTY ELECTRONIC CONTROL MODULE (ECM)
1985 Buick Skylark Custom, 2.5 R, Standard, MY8
Code 55 - Faulty Electronic Control Module (ECM)
1985 Buick Skylark Custom, 2.5 R, Standard, MY8SECTION Code 55 - Faulty Electronic Control Module (ECM)
Replace ECM. Clear codes, confirm "closed loop" operation and check for no "CHECK ENGINE" light.
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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.