88 Eldorado, Code B127, E040, No Gears

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HT4100 4.1, 4.5, 4.9 Discussion, 88 Eldorado, Code B127, E040, No Gears in Cadillac Engine Discussion; I have a 1988 Eldorado that I recently replaced the EGR valve (lots of fun). I had to remove the ...
  1. #1
    Trilo is offline Cadillac Owners Member
    Automobile(s): 1988 Eldorado
    Join Date
    Dec 2009

    Question88 Eldorado, Code B127, E040, No Gears

    I have a 1988 Eldorado that I recently replaced the EGR valve (lots of fun). I had to remove the TPS in order to remove and replace EGR. Despite my best efforts, I didn't reset the TPS properly with the ISC and throttle at absolute 0. I am doing that tomorrow.
    In the meantime, the car suddenly stopped dropping into gear. I've got the B127 code and only reverse. I also have the E040 code as soon as I jump on the highway. I thought that was a vacume line but even after clearing the codes and fixing the vac line (that kept popping out) I'm still getting the "open power steering switch circuit."
    I also replaced one of the fuel injector ports a week ago. Depsite that, the engine has been real doggy on the highway and I assumed it was the throttle postion sensor needed to be reset and recalibrated.
    Does this model have a Crank Shaft Postion Sensor or could it be the Neutral safety switch, or the gear selector switch?
    This was a great car but it sat for almost a year because I was driving my truck.

    Are any of these things related?

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  3. #2
    Dave S Texas's Avatar
    Dave S Texas is offline Cadillac Owners Enthusiast
    Automobile(s): '87 Coupe DeVille 4.1L FWD(New engine '08) 1981 F100 '03FXDL
    Join Date
    May 2008
    Austin(area), Tx

    Re: 88 Eldorado, Code B127, E040, No Gears

    The Cadillac owner who is a DIY'er need to have the FSM for his model.
    Plenty on ebay:


    The best tool you can have......

  4. #3
    carnut is offline Cadillac Owners Master
    Automobile(s): 1999 BMW 740 Il. 2005 Jag XK8, 1988 Mercedes Benz 300 SE
    Join Date
    Feb 2003

    Re: 88 Eldorado, Code B127, E040, No Gears

    "I only have reverse" so in reverse on the highway you get a e040 code?? Try to be a little more precise please. The E040 code is usually the switch on the rack and pinion that is either failed electrically or the wiring connector on it is poor fitting (loose). It screws in where the 2 hydrallic lines enter the steering rack just under the power brake unit. I've had some luck with removing this switch, depressing the ck ball in the switch while spraying carb cleaner on the ck ball, then reinstalling it making sure the wiring connector provides a real tight fit. Then erase the code. The shifter is a cable thats clamped to the neutral safety switch on the top of the transmission. Theres a retainer collar on the cable that can be loosened to allow the cable back and forth adjustment. If you were in that area trying to adjust it, you could have disturbed the power steering switch or its connection.

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