Page 1 of 2 12 LastLast
Results 1 to 10 of 11

Thread: Problem with DTC PO342 Camshaft Position sensor circuit low

  1. #1
    New Member
    Join Date
    Jan 2009
    Posts
    7

    Default Problem with DTC PO342 Camshaft Position sensor circuit low

    Just new to this game......running a 24X LS7 on a LS1 pcm. Generally engine starts & idles well. However occasionally engine refuses to start - backfiring or not firing at all. Sometimes it will take 10 or a dozen goes at turning the key on and off before it goes. Other times just once or twice. Pcm comes up with "camshaft position sensor circuit low", which I am told is a problem with the ground signal wire. I have checked the cam sensor wiring harness and it appears ok. Not sure what do do next???

    Being a 24x engine we are running a 2x camshaft timing wheel.

  2. #2
    Senior Member exploder's Avatar
    Join Date
    Aug 2008
    Posts
    141

    Default

    I don't know if it will help you much, but the 3 bolts that hold the cam to the timing gear sometimes come loose and cause the code....ask me how I know. There have been several others that it has happend to. I red locktited my bolts and have been trouble-free since.
    03 z06 auto
    ver7.5.5 custom OS5
    415 ci
    239/255 .624 lift LSr grind
    16psi
    Meth injection
    PLX WB02

  3. #3
    New Member
    Join Date
    Jan 2009
    Posts
    7

    Default

    Thanks exploder. Will check this......

  4. #4
    Junior Member 3fingas's Avatar
    Join Date
    Oct 2008
    Posts
    27

    Default

    What year harness? Some have a cms loop with male and female connector by top tensioner. Purple weatherpak. If unplugged or eliminated car will start intermittently.

  5. #5
    New Member
    Join Date
    Jan 2009
    Posts
    7

    Default

    Its a new custom harness so don't think this could be the issue. But will check.....thanks

  6. #6
    Joe (Moderator) joecar's Avatar
    Join Date
    Apr 2003
    Posts
    20,649

    Default

    Quote Originally Posted by LSXstart View Post
    Just new to this game......running a 24X LS7 on a LS1 pcm. Generally engine starts & idles well. However occasionally engine refuses to start - backfiring or not firing at all. Sometimes it will take 10 or a dozen goes at turning the key on and off before it goes. Other times just once or twice. Pcm comes up with "camshaft position sensor circuit low", which I am told is a problem with the ground signal wire. I have checked the cam sensor wiring harness and it appears ok. Not sure what do do next???

    Being a 24x engine we are running a 2x camshaft timing wheel.
    You mean a x1 cam wheel, right...? Do you have any pictures...? Just a thought.

    Quote Originally Posted by 2001/2002 F-body Service Manual
    Camshaft Position Sensor

    The camshaft position (CKP) sensor works in conjunction with 1x reluctor wheel mounted at the rear of the camshaft. The CMP is used to determine the top dead center position of cylinder #1, and will synchronize with the 24x CKP sensor signal for quicker starting. The PCM will detect an increase in the mass airflow (MAF) sensor signal when the engine starts. The CMP signals are output as a digital waveform.

  7. #7
    Lifetime Member jfpilla's Avatar
    Join Date
    Apr 2003
    Posts
    666

    Default

    I remember that there was an issue, at least a year ago, that the sensor wires needed to be reversed. I don't remember more than that. Maybe someone knows more?
    2003 red vert
    Mods:
    LS7 crate engine, wet sump, 24xx reluctor
    LPE 100mm MAF
    Vararam, cold air intake and bridge
    RPM Level 6/4L60e trans
    3.42 gears
    Yank SS3600
    1-7/8" AR headers
    Z06 exhaust
    470rwhp 437rwtq
    1/8th mi-1.526-60'-6.862-1/8th-@100.74mph

  8. #8
    New Member
    Join Date
    Jan 2009
    Posts
    7

    Default

    Quote Originally Posted by joecar View Post
    You mean a x1 cam wheel, right...? Do you have any pictures...? Just a thought.
    Thanks for the advice guys. Fingers crossed but looks like the problem was a faulty cam sensor.

  9. #9
    Joe (Moderator) joecar's Avatar
    Join Date
    Apr 2003
    Posts
    20,649

    Default

    Quote Originally Posted by summerscheifer View Post
    hi mates. definitely have the same problem the Pcm comes up with camshaft position sensor circuit low. Now I need to replace the camshaft position sensor, i removed the wiring harness, then the 8mm bolt, i removed it slowly and the sensor split in 2 pieces? but i don't know what will be the next step. I appreciate any help. thanks
    Where did it break off...? Does the piece in the block move at all when you wiggle it...?

    Which year/model/vehicle and which eng/trans RPO's...?

  10. #10
    Lifetime Member
    Join Date
    Apr 2007
    Posts
    235

    Default

    The Gen IV engine have the camshaft position sensor in the front timing cover. It can be used with a LS1 PCM however the two outside wires must be crossed to make it work correctly or you can buy an aftermarket adaptor that plugs in between the harness and sensors.

Page 1 of 2 12 LastLast

Similar Threads

  1. Vortec camshaft retard offset
    By Dave_62 in forum Vortec V6/V8 Specific
    Replies: 23
    Last Post: 3 Weeks Ago, 04:17 AM
  2. P2563 code "Turbocharger Boost Control Position Sensor Performance"
    By Truckin Stuff in forum Duramax 06 LLY / 06+ LBZ & LMM
    Replies: 0
    Last Post: December 3rd, 2009, 01:11 PM
  3. Pedal position vs. commanded TAC position weirdness
    By gmtech16450yz in forum V8, V6, L4 - E38, E67 & E37 ECM's
    Replies: 14
    Last Post: November 1st, 2009, 12:48 PM
  4. E38 Crank Position Sensor Relearn
    By hapnermw in forum Gen IV V8 Specific
    Replies: 3
    Last Post: May 2nd, 2009, 04:58 PM
  5. Crankshaft Position Sensor Code
    By jfpilla in forum General (Petrol, Gas, Ethanol)
    Replies: 9
    Last Post: October 23rd, 2006, 04:08 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •