Question about 1995 Cadillac DeVille

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I have a 1995 Cadillac Sedan Deville with 109k miles. I bought it new, and it's been without any major problems. Now there is a consistant engine shut down problem after driving or at idle for 7 minutes from a cold start. It will not restart, and acts like a bad fuel pump. But, after 15 to 20 minutes of trying to restart, it will start, and run fine city and high way, as if nothing was wrong. It's as if a temperature sensor or relay tells the engine to shut down, but then resets. These are the error codes that show: P012H (no distributor signal),P023H(electric spark timing EST signal problem EGR), P052H(PCM memory reset),P053H(distributor signal interrupt), Code Poss Current I039H(loss of road sensing suspension data),I052H(keep alive memory error),No ACP,No SIR,No TCS code,PCM?. Help!!! Zak

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I have a similar issue with a 94 DeVille. Runs for a while then shuts down. Fuel pressure is good (I drove around with a pressure gauge attached and it still shut down with no drop in pressure). I've replaced the idle control and ignition module - no improvements.
I too have code P012 showing which to (potentially) the crank position sensor - which I can't seem to locate.
Any luck on your issue?

Posted on Oct 06, 2010

  • johnandpatdz Oct 07, 2010

    Hi Venuti.. On my shut down problems with my 95 Deville, I took it into a Cadillac Dealer who said it was the "hall effect switch" and lower wiring both of which are on the under side of the distributor. To get to this switch, you need to pull out the distributor assembly. If you do this, you have to make sure you mark the position of the gears.. otherwise you will screw up the timing. I didn't want to sink any more $'s into the car, so I sold it for $2K. Hope you have better luck. Zak

  • venuti Oct 07, 2010

    johnandpatdz (Zak) - Thanks for the response. I suspect your issue is/was the same as mine. Since I have the time and want to just get rid of the car - I'm just about to pull the distributor and replace the Hall effect switch which I can now see but need a distributor wrench to access (another trip to the parts store). I too need to just sell this thing before the snow flies - its no longer a primary vehicle. If I can get $2k for it - I'd be satisfied.
    Its been a great car up to this point...but the current issues is overwhelming.
    Good luck to you as well.



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