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.
Pcm Code EO98, Park/Neutral To Drive/Reverse While Outside Of ISC Control Range - ELDORADO & SEVILLE: Action
PCM will retard ignition timing and set Code EO98. No service message.
This test monitors idle speed and gear selection from Park or Neutral to Drive or Reverse when the throttle is in ISC speed range. If idle speed is greater than desired, PCM will retard spark advance and set the code.
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.