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 EO58, Pass Key Control Problem: Action
PCM turns on SERVICE ENGINE SOON message on CCDIC panel and will enable fuel injection on future ignition cycles without regard pass key fuel enable input status.
Once engine is running, PCM constantly monitors fuel enable signal from pass key module. PCM will not cancel fuel injection once it has seen a proper pass key module signal; therefore, stalling conditions cannot occur as a result of a pass key malfunction.
- If engine will crank, problem has been isolated to pass key module, PCM or fuel enable circuit. If engine will not crank, see pass key system diagnosis.
- Checking voltage to PCM will identify if PCM is at fault. Typical signal will be about 2.5 volts.
- Voltage too low, could be a pass key module, poor connection at PCM, or a short to ground in fuel enable circuit.
- Voltage too high, could be a pass key module, poor connection at pass key module, short to voltage or an open in fuel enable circuit.
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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.
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