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Thread: Probs Body Control Module (Intermittent)

  1. #1
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    Default Probs Body Control Module (Intermittent)

    Would appreciate your help guys.
    a) Code found - U0140-00 ... no communication with Body Control Module
    b) Car goes into limp home
    c) Does anyone have a graphic on where all the "ground points" are (as a diagnostic starting point)? ...that they could share?
    d) I need to check the BCM connection - perhaps clean and use some dialectic grease on it as well.

    I regret not purchasing a service manual. I may need to now. ....but in the meantime - would you gents throw me a bone?

    Henry
    2009 G8 GT
    ARH Long Tubes 1 7/8" & full exhaust / Magnaflow Mid Muffler / Cherry Bomb Vortex Mufflers / Magnuson Supercharger 1.9 / Overdrive "non-cog" pulley system / Ported blower base / 2.70" Pulley / LS3 rockers with Trunion upgrade / Trick Flow x255 cylinder heads / 8-Rib Pulley system / Innovator West 10% Balancer / DOD Delete / Lunati Lifters / Custom Patrick G Cam Grind / Wiseco Forged Pistons / Injector Dynamics 85lbs / 4" RotoFab Intake Tube / 102mm MAF Tube / 102mm TPIS Throttle Body / LS7 MAF Card / ZL1 Fuel Pump / JMS Fuel Pump Booster / VaporWorx Controller / B&M Tranny Cooler with fan / Circle-D Heavy Duty Rebuild & 265mm triple Disc Billet Converter / Camaro Tranny Pan / Custom Engine & Tranny Tune by Patrick G / Eibach Lowering Springs / BMR Front & Rear Sway Bars, LCA's, Control Arms / DBA 4000xs Rotors / Hawks Ceramic Pads / Breyton BE Wheels

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    VIP Member STL_G8GT's Avatar
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    I don't believe I have a diagram of all of the grounds. I have one that lists them, but not with a corresponding picture.
    2009 PBM G8 GT
    Pat G 218/226 & TSP Dual 660s, ARP Bits, DSteck Tuned, Magnacharger Chrome 2300 1:1, RCR Ported/Polished TB, Blower, & L92 Heads w/ LS3 intake valves, Smith Brothers Trunion Bushing Kit, ARH 1 7/8 Magnaflow MidMuff/Solo Axlebacks, RotoFab, VaporWorx PWM 1:1 fuel system, ID1050x injectors
    Mike Norris Motorsports Catchcan, AEM 30-4100, JHP Boost/Fuel Gauge Pod
    TSW Nurburgring Matte Gray 18" w/Nitto 555 & 555R, Satin Black SS Brembo Fronts, BMR Trailing Arms, Pedders Sway Bars, Whiteline Bushings
    Gloss Black Valve Covers, 6k HID, V6 Handles, Interior/License Plate LEDs, Debadged, Holden Black Trim, Polk Dxi, GXP diffusor, a few bits from Crazy Paul

    Originally Posted by TonyKarter
    Anyone who has ever worked on a car has been in your position, and sitting cross-legged on a concrete floor with a dim shop light is its own kind of hell... Chalk it up as one of the rites of passage.
    RIP Charlie - GRRRR8
    RIP Chris Wells - Panzer Leader

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    VIP Member STL_G8GT's Avatar
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    G110 is MAF, ECM, even ign coils. I think that one is the engine block, which is then jumpered to the frame at the front left to the abs bracket.
    G201 is BCM, Airbags, Sunroof, all sorts of stuff. It's most likely the ground under the dash to the left looking at the steering wheel.

    Is the code pending, history, or current?
    2009 PBM G8 GT
    Pat G 218/226 & TSP Dual 660s, ARP Bits, DSteck Tuned, Magnacharger Chrome 2300 1:1, RCR Ported/Polished TB, Blower, & L92 Heads w/ LS3 intake valves, Smith Brothers Trunion Bushing Kit, ARH 1 7/8 Magnaflow MidMuff/Solo Axlebacks, RotoFab, VaporWorx PWM 1:1 fuel system, ID1050x injectors
    Mike Norris Motorsports Catchcan, AEM 30-4100, JHP Boost/Fuel Gauge Pod
    TSW Nurburgring Matte Gray 18" w/Nitto 555 & 555R, Satin Black SS Brembo Fronts, BMR Trailing Arms, Pedders Sway Bars, Whiteline Bushings
    Gloss Black Valve Covers, 6k HID, V6 Handles, Interior/License Plate LEDs, Debadged, Holden Black Trim, Polk Dxi, GXP diffusor, a few bits from Crazy Paul

    Originally Posted by TonyKarter
    Anyone who has ever worked on a car has been in your position, and sitting cross-legged on a concrete floor with a dim shop light is its own kind of hell... Chalk it up as one of the rites of passage.
    RIP Charlie - GRRRR8
    RIP Chris Wells - Panzer Leader

  4. #4
    Beyond Help Napalm's Avatar
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    Check the fuses for comm enable, ecu, tcu, under the hood

    check the fuses for security, IP, and I suspect there's another one related to controls.

    Those all interplay with the BCM.

    There there are some relays and one is even labeled communications - I think it's an interior relay. It might have gone bad or weakly contacts. Hard to say.

    Then I would check battery voltage, and if the car cranks - I'd check voltage at the battery with the car running just to make sure it's up over 12. you should get a alternator light if it wasn't but doesn't mean there aren't other issues.
    If Guns Kill people, then Spoons Cause Diabetes

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    If you guys were near - I would buy each you beer and fajitas!

    Thanks for the leads!

    Will chase this tonight!


    Sent from my iPhone using Tapatalk
    2009 G8 GT
    ARH Long Tubes 1 7/8" & full exhaust / Magnaflow Mid Muffler / Cherry Bomb Vortex Mufflers / Magnuson Supercharger 1.9 / Overdrive "non-cog" pulley system / Ported blower base / 2.70" Pulley / LS3 rockers with Trunion upgrade / Trick Flow x255 cylinder heads / 8-Rib Pulley system / Innovator West 10% Balancer / DOD Delete / Lunati Lifters / Custom Patrick G Cam Grind / Wiseco Forged Pistons / Injector Dynamics 85lbs / 4" RotoFab Intake Tube / 102mm MAF Tube / 102mm TPIS Throttle Body / LS7 MAF Card / ZL1 Fuel Pump / JMS Fuel Pump Booster / VaporWorx Controller / B&M Tranny Cooler with fan / Circle-D Heavy Duty Rebuild & 265mm triple Disc Billet Converter / Camaro Tranny Pan / Custom Engine & Tranny Tune by Patrick G / Eibach Lowering Springs / BMR Front & Rear Sway Bars, LCA's, Control Arms / DBA 4000xs Rotors / Hawks Ceramic Pads / Breyton BE Wheels

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    If you have a “list” of ground points you can share — “mucho appreciado!”




    Sent from my iPhone using Tapatalk
    2009 G8 GT
    ARH Long Tubes 1 7/8" & full exhaust / Magnaflow Mid Muffler / Cherry Bomb Vortex Mufflers / Magnuson Supercharger 1.9 / Overdrive "non-cog" pulley system / Ported blower base / 2.70" Pulley / LS3 rockers with Trunion upgrade / Trick Flow x255 cylinder heads / 8-Rib Pulley system / Innovator West 10% Balancer / DOD Delete / Lunati Lifters / Custom Patrick G Cam Grind / Wiseco Forged Pistons / Injector Dynamics 85lbs / 4" RotoFab Intake Tube / 102mm MAF Tube / 102mm TPIS Throttle Body / LS7 MAF Card / ZL1 Fuel Pump / JMS Fuel Pump Booster / VaporWorx Controller / B&M Tranny Cooler with fan / Circle-D Heavy Duty Rebuild & 265mm triple Disc Billet Converter / Camaro Tranny Pan / Custom Engine & Tranny Tune by Patrick G / Eibach Lowering Springs / BMR Front & Rear Sway Bars, LCA's, Control Arms / DBA 4000xs Rotors / Hawks Ceramic Pads / Breyton BE Wheels

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    VIP Member STL_G8GT's Avatar
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    Quote Originally Posted by hflores3 View Post
    If you have a “list” of ground points you can share — “mucho appreciado!”




    Sent from my iPhone using Tapatalk

    The list I have is about fifteen ground points, and then each one you can click on and it shows the circuits it impacts, but not the location. It wouldn't do much good visually. The two I referenced are the ones that would impact the bcm and ecm. It's possible that another module lost contact with the bcm, not the bcm losing its ground, if that makes sense. In that case, though, I'd imagine other codes would be tripped.

    Again - is the code pending, current, or history? Is it an intermittent thing? When you shut off and restart is the car fine?
    2009 PBM G8 GT
    Pat G 218/226 & TSP Dual 660s, ARP Bits, DSteck Tuned, Magnacharger Chrome 2300 1:1, RCR Ported/Polished TB, Blower, & L92 Heads w/ LS3 intake valves, Smith Brothers Trunion Bushing Kit, ARH 1 7/8 Magnaflow MidMuff/Solo Axlebacks, RotoFab, VaporWorx PWM 1:1 fuel system, ID1050x injectors
    Mike Norris Motorsports Catchcan, AEM 30-4100, JHP Boost/Fuel Gauge Pod
    TSW Nurburgring Matte Gray 18" w/Nitto 555 & 555R, Satin Black SS Brembo Fronts, BMR Trailing Arms, Pedders Sway Bars, Whiteline Bushings
    Gloss Black Valve Covers, 6k HID, V6 Handles, Interior/License Plate LEDs, Debadged, Holden Black Trim, Polk Dxi, GXP diffusor, a few bits from Crazy Paul

    Originally Posted by TonyKarter
    Anyone who has ever worked on a car has been in your position, and sitting cross-legged on a concrete floor with a dim shop light is its own kind of hell... Chalk it up as one of the rites of passage.
    RIP Charlie - GRRRR8
    RIP Chris Wells - Panzer Leader

  8. #8
    Beyond Help Napalm's Avatar
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    Did this happen on a start up? get the X contact dealer , check for code, no - comms code. shut down. Restart - still X car in limp home mode.

    Then second or third start up - acts fine but the code lingers in history till cleared?

    2 things - my car did something similar but I don't have the code number a few years ago - about 2 weeks before my battery died. Checked the systems, new battery - hasn't happened since.

    So it's possible you had a low volt situation during the start up check sum and one of the modules didn't communicate with the BCM in time sequence.

    This is why I suggest you check those fuses too. If it continues - and check your battery voltages.
    If Guns Kill people, then Spoons Cause Diabetes

  9. #9
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    Did “not” happen during start up.

    I did “indeed” get the “contact dealer” message.

    I may run to AutoZone for a code read (my code reader was a Hurricane Harvey” casualty).

    I’ve got another on the way.


    Sent from my iPhone using Tapatalk
    2009 G8 GT
    ARH Long Tubes 1 7/8" & full exhaust / Magnaflow Mid Muffler / Cherry Bomb Vortex Mufflers / Magnuson Supercharger 1.9 / Overdrive "non-cog" pulley system / Ported blower base / 2.70" Pulley / LS3 rockers with Trunion upgrade / Trick Flow x255 cylinder heads / 8-Rib Pulley system / Innovator West 10% Balancer / DOD Delete / Lunati Lifters / Custom Patrick G Cam Grind / Wiseco Forged Pistons / Injector Dynamics 85lbs / 4" RotoFab Intake Tube / 102mm MAF Tube / 102mm TPIS Throttle Body / LS7 MAF Card / ZL1 Fuel Pump / JMS Fuel Pump Booster / VaporWorx Controller / B&M Tranny Cooler with fan / Circle-D Heavy Duty Rebuild & 265mm triple Disc Billet Converter / Camaro Tranny Pan / Custom Engine & Tranny Tune by Patrick G / Eibach Lowering Springs / BMR Front & Rear Sway Bars, LCA's, Control Arms / DBA 4000xs Rotors / Hawks Ceramic Pads / Breyton BE Wheels

  10. #10
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    Battery is less than 3 months old.


    Sent from my iPhone using Tapatalk
    2009 G8 GT
    ARH Long Tubes 1 7/8" & full exhaust / Magnaflow Mid Muffler / Cherry Bomb Vortex Mufflers / Magnuson Supercharger 1.9 / Overdrive "non-cog" pulley system / Ported blower base / 2.70" Pulley / LS3 rockers with Trunion upgrade / Trick Flow x255 cylinder heads / 8-Rib Pulley system / Innovator West 10% Balancer / DOD Delete / Lunati Lifters / Custom Patrick G Cam Grind / Wiseco Forged Pistons / Injector Dynamics 85lbs / 4" RotoFab Intake Tube / 102mm MAF Tube / 102mm TPIS Throttle Body / LS7 MAF Card / ZL1 Fuel Pump / JMS Fuel Pump Booster / VaporWorx Controller / B&M Tranny Cooler with fan / Circle-D Heavy Duty Rebuild & 265mm triple Disc Billet Converter / Camaro Tranny Pan / Custom Engine & Tranny Tune by Patrick G / Eibach Lowering Springs / BMR Front & Rear Sway Bars, LCA's, Control Arms / DBA 4000xs Rotors / Hawks Ceramic Pads / Breyton BE Wheels

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