Question about 2008 Ford Ranger 2WD

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'98 Ranger, MIL and O/D light on. No codes.

'98 Ranger, 2.5L, 2WD, AT, 158K miles. MIL and O/D light are on (not blinking). Scans with two different code readers resulted in "no codes present". Poor trans hookup in D and R. Have to overrev to get the truck moving. Manual 1st and 2nd OK with engine braking. Fluid level is good. Fuses/relays are good. Are these symptoms of a bad PCM or a combination of bad PCM and failing trans? How do I "shadetree" test PCM to determine if its fried?

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  • aspinwg Jul 18, 2009

    Thank you for your response. The fluid is nearly fresh Mercon V - level is correct with tranny at temperature and engine idling in park. This is the first time (in my experience) where I couldn't pull a code when the check engine light was on. I cleaned the connection to the PCM hoping it was just a corrosion problem but, nothing has changed.

  • warlock61
    warlock61 May 11, 2010

    don't understand how you have mil light with no codes how is the fluid?


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Generic Code readers may not pull codes from the Transmission Control Module. They tend to just be OBD II Global readers (which means they can talk to the PCM and that's it). You probably have a transmission issue but need a better Scan Tool to retreive the codes.

Posted on Jul 21, 2009

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