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Engine Stalling - Multiple Codes

Discussion in 'Electrical' started by CrimSonami, Sep 30, 2024.

  1. Sep 30, 2024 at 1:06 PM
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    CrimSonami

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    CrimSonami [OP] Member

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    So - new member in need of help and/or direction. I can usually solve issues on my own, but my patience and expertise are failing here. My 4.7L 2WD '07 GC Laredo is stalling and giving me multiple codes.
    B212D - Ignition Run Only Input Circuit Open - Replaced the relay.
    P0129 - Barometric Pressure Too Low - Replaced the MAP sensor.
    P0522 - Engine Oil Pressure Sensor Circuit Low Voltage - Replaced sensor.
    U0159 - Lost Communication with Parking Assist Control Module. ???
    I've replaced the ECM as well. (Had the original failed unit in the cabinet so took a shot)
    Hooked up a multimeter to the battery and watched until it stalled, no voltage drop.
    My code reader is the Mac TaskPlus unit, if that matters.
     
    CrimSonami, Sep 30, 2024
    #1
  2. Oct 4, 2024 at 8:43 AM
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    Bob

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    Bob Well-Known Member Moderator

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    any update on this? has a shop looked at it
     
    Bob, Oct 4, 2024
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  3. Oct 4, 2024 at 9:38 AM
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    CrimSonami

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    CrimSonami [OP] Member

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    Not yet. I did talk to the shop manager who I had do the engine replacement about it and he offered to have his tech look it over but I haven’t had it hauled over as of yet. I have it back in my garage now after getting my convertible back window reglued this morning. I’ll start looking the wiring harness over later but I’m out with the wife’s car now having a TPMS sensor replaced and tires rotated and balanced. ALWAYS SOMETHING!
     
    CrimSonami, Oct 4, 2024
    #3
  4. Oct 5, 2024 at 8:23 AM
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    CrimSonami

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    CrimSonami [OP] Member

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    Update:
    Good voltage and ground to oil pressure sensor, map sensor, fuse-relay panel, run/start relay and new ECM. Code B212D will not clear/erase from Occupant Restraint Control Module. Airbag has been on for months. Is this module available for purchase and/or is it a dealer install/reset only?
     
    CrimSonami, Oct 5, 2024
    #4
  5. Oct 5, 2024 at 11:37 AM
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    CrimSonami

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    CrimSonami [OP] Member

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    IMG_7284.jpg Update 2:
    The B212D code has been cleared and the airbag light is now off. The fuse holder in the attached pic had only one 10a fuse which the diagram and YouTube videos call for 2. Once the 2nd fuse was installed the code cleared as requested and hasn’t returned, yet. Still getting Low Barometric Pressure & Low Voltage to Oil Pressure sensor. It runs but drops in RPM to near stall at which point the OP light displays the stalls soon after.
     
    CrimSonami, Oct 5, 2024
    #5
  6. Oct 6, 2024 at 6:49 AM
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    CrimSonami

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    CrimSonami [OP] Member

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    So, now idle RPM drops, oil light comes on and stalls shortly after. I’ve changed both sensors and verified good voltage, continuity. Is the combination of low barometric pressure and low voltage to oil pressure sensor a symptom of vacuum system loss? Could it be the alternator is losing amperage?
     
    CrimSonami, Oct 6, 2024
    #6
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