P0340 - Camshaft Position (CMP) Sensor Circuit
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Cadillac Seville / Cadillac Eldorado Forum Discussion, P0340 - Camshaft Position (CMP) Sensor Circuit in Past Cadillac Vehicle Discussion; Oh joy, a new code and new problem! LOL, just had my power steering pressure hose replaced on Monday and ...
  1. #1
    jcresciSTS is offline Cadillac Owners Enthusiast
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    P0340 - Camshaft Position (CMP) Sensor Circuit

    Oh joy, a new code and new problem! LOL, just had my power steering pressure hose replaced on Monday and now this. Started yesterday, I've had a hesitation when just warming up but it would go away after I hit the gas pedal twice, but yesterday my car was barely moving and this lasted a few minutes, about 5 times hitting the pedal from a stop. Once about halfway warmed up the car is perfectly fine, no loss of power at all and idle feels normal.

    Also, after car was sitting for about a couple of hours last night and was about halfway warm and turned on I hit the rear defrost and the RPMs bounced up and down from about 500-1000 then settled after about 5x of doing it.

    What am I looking at as far as repairs go? Something I should get done soon?

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    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: P0340 - Camshaft Position (CMP) Sensor Circuit

    Not a bad job. Part #236 (rear head, passengers side). Cost should be in the neighborhood of $50.


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    sts 03's Avatar
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    Very easy to replace.takes about five minutes.

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    jcresciSTS is offline Cadillac Owners Enthusiast
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    Re: P0340 - Camshaft Position (CMP) Sensor Circuit

    That's great to hear. Just need to get home from work tonight and will take care of this tomorrow before work. Sucks hitting the gas and the car barely moves! Why does it run perfectly fine when warmed up?

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    Ranger's Avatar
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    Re: P0340 - Camshaft Position (CMP) Sensor Circuit

    BTSOM!

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    jcresciSTS is offline Cadillac Owners Enthusiast
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    Re: P0340 - Camshaft Position (CMP) Sensor Circuit

    hahaha well I guess with 180k on the clock I should expect more things to start failing

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    Submariner409 is offline If it won't run, chrome it
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    Re: P0340 - Camshaft Position (CMP) Sensor Circuit

    Ummmm...............If you had the P/S pump replaced, that's next to, and the hoses also, the CMP and its harness. Have you looked to see if it was unplugged for work room ?..........or if the wire(s) were yanked from the connector ?

    If the CMP is "not working" the ignition timing defaults to a static calculated 10 degrees BTDC - the engine will run but the car will feel unresponsive and sluggish.

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    Aztec ETC ECS's Avatar
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    Re: P0340 - Camshaft Position (CMP) Sensor Circuit

    Not a bad job?
    Very easy to replace? Takes about five minutes?

    I'm assuming you two guys have never actually changed one.
    Either that or you have 3 very small hands.

    The first challenge is seeing it.
    There's only a couple inches of clearance with 2 heater hoses in the way.

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    sts 03's Avatar
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    I changed mine last year in like five minutes

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    Re: P0340 - Camshaft Position (CMP) Sensor Circuit

    I don't have my STS anymore. Is there more room to get to it in the STS than in the Eldo? Because it takes more than 5 minutes just to see it in the Eldo.

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    MoistCabbage's Avatar
    MoistCabbage is online now Cadillac Owners 10000+ Posts
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    No, not much room in the 5th gen Sevilles either. If you have big hands or arms, you'd better be able to hold small fasteners scissor grip style, with your index and middle fingers.

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    Aztec ETC ECS's Avatar
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    Re: P0340 - Camshaft Position (CMP) Sensor Circuit

    I gotta see the 5 minute thing for myself.

  14. #13
    MoistCabbage's Avatar
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    I replaced mine about a month ago, took less than 10.

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    On mine there wasn't anything in the way all though the person who had the car before me changed the power steering return line and re routed it another way cause he just used a plain ol rubber hose.(still need to change that)

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    jcresciSTS is offline Cadillac Owners Enthusiast
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    Re: P0340 - Camshaft Position (CMP) Sensor Circuit

    My mechanic said $100 for the part and $50 labor. Has to order it so he won't be able to get it done until Monday.

    Sub, I think it is beginning to fail. I would hit the gas and the car would barely want to move and that lasted a few minutes, about 5 times hitting the gas then it went away when car was just about halfway warmed up. Cleared the codes last night and as soon as I turned the car on the SES light came on, I let it warmed up for a few minutes and didn't really feel any performance issues when starting out. It is possible something might have got unplugged, I'll try to see if I can find it by looking at the pic above, but I didn't have the bogged down issue until Wednesday when I hopped in and let it warm up for like 10 secs then immediately started driving. Like I said too, I've had a slight hesitation issue for a few months now, assumed it was a vacuum leak but then that happened Wednesday and I have never had this code before.

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