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Electrical problems with 07 Yukon

Discussion in 'Engine & Drivetrain' started by schweg, Nov 21, 2020 at 8:38 PM.

  1. schweg

    schweg TYF Newbie

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    I have a 2007 Yukon SLT 5.3L that is having some strange electrical problems.

    It had been running perfectly for some time now, no real electrical problems. The other day I went to start it after letting it sit for a couple weeks (the joys of working from home) and there was no power at all, no lights, no power door locks, no dashboard lights. Took the battery out and hooked it up to a charger but it wouldn't take a charge and the diagnostic code from the charger said there was an internal short in the battery. OK, easy fix, just go to Walmart and get a new battery. Put the new battery in and the dashboard lights now come on, but the door locks don't have power, no dome lights, no radio power, and the engine will not turn over. When you turn the ignition to the on position you can her a click from the engine bay.

    After reading through the forums I decided it must have a bad negative battery wire. No need to test it out, that seems like a good bet, so off I go to the GMC dealer to get a new cable. Seemed like it would be an easy replacement, but that ground under the radiator is a real pain in the a$$ to get to. Couldn't find any good explanations on the internet how to that but finally realized that it's not so bad if you turn the wheels to the right and go through the wheel well (not exactly easy to do with the engine off). Anyway, finally got the new negative battery cable installed and the new battery hooked up. Still no dome lights, no power door locks, no radio, Noticed that the climate control systems seems to still be working, fan runs, ect. dashboard still lights up but random error messages are starting to pop up. Still hear a click in the engine bay when I turn the key to the on position but the engine does not crank over.

    Decided it might be a good idea to plug in my code reader. There was a grand total of 32 codes! Never seen that before. For what it's worth here's the codes it listed:

    P0603 Internal control module keep alive memory (KAM) error
    P0604 Internal control module random access memory (RAM) error
    P0716 Input / turbine speed sensor A circuit range / performance
    P0717 Input / turbine speed sensor A circuit no signal
    P0722 Output speed sensor circuit no signal
    P0752 Shift solenoid A stuck on
    P0973 Shift solenoid A control circuit low
    P0974 Shift solenoid A control circuit high
    P0976 Shift solenoid B control circuit low
    P2770 Torque converter clutch circuit high
    U0073 Control module communication bus off
    P0602 Control module programming error
    P0603 Internal control module keep alive memory (KAM) error (not sure why this one is listed twice)
    P062F Internal control module EEPROM error
    P0722 Output speed sensor circuit no signal
    P0723 Output speed sensor circuit intermittent
    P0741 Torque converter clutch circuit performance / stuck off
    P0742 Torque converter clutch circuit stuck on
    P0751 Shift solenoid A performance / stuck off
    P0756 Shift solenoid B performance / stuck off
    P0757 Shift solenoid B stuck on
    P0974 Shift solenoid A control circuit high
    P0976 Shift solenoid B control circuit low
    P1810 Manufacturer control
    P1815 Manufacturer control
    P1816 Manufacturer control
    P1818 Manufacturer control
    P2534 Ignition switch run / start position circuit low
    P2764 Torque converter clutch pressure control solenoid control circuit low
    P2770 Torque converter clutch circuit high
    P3237 DTC definitions not found
    P2100 DTC definitions not found

    I hate to bring this up, by last year the oil pressure sensor went bad in this car. I ended up taking out the intake manifold to replace it and was surprised to find a big rats nest under the intake manifold. What a strange place to make a home. Looks like the rat had eaten a hole in the foam rubber seal towards the back of engine and had found a way to get in there. Since then I have bought an electric rat zapper and I've caught 7 of those guys in my garage. I'm sort of worried that since my car has been sitting for a couple weeks, maybe they have been nibbling on the wiring harness...

    Does this sound familiar to anyone? Any advice on what I should try next would be greatly appreciated. Please save me from randomly replacing parts!

    Thanks!
    Eric
     
  2. wjburken

    wjburken Supporting Member

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    Well.....Welcome to the forum from Iowa. I think you win the contest for most DTC codes in your first post!:eek:

    Low voltage conditions are hard in these vehicles. I would check absolutely any ground wire connections and power wire connections you can find and make sure they are all solid and not corroded.
     
  3. Doubeleive

    Doubeleive Supporting Member

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    I agree with Wade you probably have some form of electrical power issue going on.
     
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  4. Jason in DLH

    Jason in DLH Cheese Burger and Fries

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    Definitely won the most codes award! Must have given you a real shock to see the nest!
     
  5. schweg

    schweg TYF Newbie

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    Do bite marks count as corrosion?
     
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  6. wjburken

    wjburken Supporting Member

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    Sure! Corrosion, bite marks, they’re both bad.
     
  7. Joseph Garcia

    Joseph Garcia Supporting Member

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    Welcome to the Forum from NH.

    Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.

    I hope that you will become a participating member in the Forum's discussions.

    Pics, please.

    As folks posted above, check out all ground wires and connections first. Also check for any corrosion on the positive battery cable, particularly close to the battery connector, including under the wire's insulation cover.
     
  8. schweg

    schweg TYF Newbie

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    Here's the new battery with the new negative battery cable installed. The positive terminal looks pretty clean.

    Battery.jpeg

    I replaced the mega fuse this morning just for kicks:

    MegaFuse.jpeg

    And here's a pic of the engine ground (the contact is cleaner than it looks here):

    Engine Ground.jpeg
     
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  9. 89Suburban

    89Suburban Full Access Member

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    Following this one for sure!!

    Holy mackerel!

    I had the same issue when I pulled my intake off both foam seals were destroyed I think by a squirrel because there was a peanut shell under there as well. So it’s not unheard of that is a favorite place for animals to dig into on these rigs.

    When I reinstalled the intake I left that foam bullshit out of there.

    HOPEFULLY that shorted battery did no harm to the sensitive components. Did you check all your fuses and relays?
     
  10. schweg

    schweg TYF Newbie

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    Here's a pic of the nest (maybe it was a squirrel?):

    IMG_1122.jpg

    IMG_1122.jpg
     
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