Sigue (88 745GLE, automatic) has decided that he won't go into overdrive on the freeway. Travelling at 4500rpm to keep up with traffic is annoying (though it's easier to pass!). Nothing seemed to telegraph this--I just noticed one day that the revs were too high at 45mph, and it's been refusing to upshift since then. Tranny fluid is clean and at the proper level. Pushing the overdrive button does nothing but make the light come on and off. Am I correct in guessing that this is a symptom of the O/D solenoid going bye-bye, or is it something more ominous?
If it is the solenoid, is this a DIY fix, or is it better to let a shop do it?
TIA for any advice, as always!
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