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Thread: 5.3L won?t go into closed loop P0134, P0154

  1. #1
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    5.3L won?t go into closed loop P0134, P0154

    89 S15 Jimmy with a 5.3L DBC out of an 02
    Runs good but keeps throwing the two codes. O2s are new. I didn?t do the swap but I?m the one who bought it and is fixing all the mistakes lol. Any ideas?

  2. #2
    Tuning Addict 5FDP's Avatar
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    What are the sensors doing on the scanner?

    Are they even functioning or showing any movement?

    The P0154 points to no activity, so there is a power/ground issue there. Check all fuses related to the o2 sensors. It will never enter closed loop if that sensor does not work.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  3. #3
    Tuning Addict blindsquirrel's Avatar
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  4. #4
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    Quote Originally Posted by 5FDP View Post
    What are the sensors doing on the scanner?

    Are they even functioning or showing any movement?

    The P0154 points to no activity, so there is a power/ground issue there. Check all fuses related to the o2 sensors. It will never enter closed loop if that sensor does not work.
    I will check for power when I get home, it?s got a Painless Swap Harness in it so there?s only 4 or 5 fuses on that harness.

  5. #5
    Advanced Tuner Shrek's Avatar
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    It is difficult to assist you, when you fail to post your current tune.

  6. #6
    Tuner in Training
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    Run it open loop and set your EQ to 1 across the board

  7. #7
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    Quote Originally Posted by sayangetsome View Post
    Run it open loop and set your EQ to 1 across the board
    I will post tune when I get it back together. It was a wire nightmare previous owner had extra wires tucked under the vortec cover and just a mess all n all. I pulled the whole harness putting the pcm inside the cab and will post tune and stuff when it?s back running in a day or so.

  8. #8
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    i would like to know what you fine

  9. #9
    Tuner in Training
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    im curious too