Question about 2001 Cadillac DeVille

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Po386 I've had the crank sensor a replaced once and the b sesor twice,thinking that the sesor was defective from manufacturer I took it back to checker auto parts.after replacement the second time I took to a variety of emission specialist, icluding cadillacs and no one seems to know what the problem is. they say the sensors are fine. but in emissions the failure is due to po386 which is crank sensor "B" performance. Is there anyone that might be familiar with trhis?

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  • roosevelt lewis Feb 07, 2012

    How do I go about repairing it? Up untill this point I amfair game for certain few mechanics that consider me fair game for over pricing, realizing that I can't drive without repairs.

  • roosevelt lewis Feb 07, 2012

    How do I determine which is which? The battery is brand new,the sensor is new and there is no drag in my starter. So I am left with a fault in my wiring. how do i go about fixin it?

  • Steve Feb 07, 2012

    I can't see why it would fail emissions over that code it not really related unless its causing the engine to run really rough.

    I not sure how to proceed with finding the fault in the wiring .. Maybe try and replace the Crankshaft position sensor & also follow the wiring from the sensor to the computer if you can to see if there is a break.

  • roosevelt lewis Feb 08, 2012

    Yes that is my sentiment exactly, the car run great,But since i have the ses light on here in arizona it's,an automatic failure. If I could get a diagram of the wire from the sensor to the pcm I could trace it myself. cadillacs charge $130.00 an hour and they say it's a four hour job!!!! Ridiculous. Any help would be appreciated. The sensor has been replaced twice. The sensor is fine.

  • Steve Feb 08, 2012

    For a wiring diagram you can see if a Haynes Manual has it for that car. I know they have few wiring diagrams but not sure if they have that detailed.

    This is another option .. I am not sure if you have any Auto Values in Arizona or something like it they can clear the codes on the car which will remove the engine light. They usually do it free. Then you could take it in the shop hopefully the engine light does not come back on and gets passed. I had to do that on my wife's car here in Canada, Alberta.

    Well I hope everything works out...

  • roosevelt lewis Mar 06, 2012

    everything has been done ,except signal plate check. what is the signal plate?



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There are a few causes that can trip that code.

- Crankshaft position sensor harness is open or shorted
- Crankshaft position sensor circuit poor electrical connection
- Faulty crankshaft position sensor
- Signal plate may be damage
- Starter motor may be faulty
- Starting system circuit
- Dead or weak battery

Posted on Feb 06, 2012


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