07 tahoe AFM removed now it will not start

Discussion in 'Performance' started by tex96, Apr 3, 2018.

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  1. tex96

    tex96 TYF Newbie

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    my wife's 07 Tahoe gave us a service message about a month ago as we were driving. It said service stablitrack and traction control off. We stopped the car as soon as we could and it had a very rough idle. I started by changing the plugs and wires but nothing helped. Towed the car home and it sat for about a week until i had time to mess with it. After removed parts and replacing a few sensors, I finally found the problem. We had a collapsed lifter. I did some research and found that the AFM system was a nightmare. I decided to the remove the AFM parts. The car sat for about 3 weeks. Last week I was off from work so I started the process of tearing down the motor to remove and replace the AFM parts and some general parts that due to the age and mileage on the car. The parts that we replaced are the following. Head gaskets, head bolts, valley cover plate, lifters, timing cover gasket, lifter guides, cam thrust plate, cam shaft, water pump, oil pump, timing chains and gears, tensioner, exh manifold, and intake manifold gaskets, belts, and had the ECM reprogrammed. I got all of this changed out and put oil and water back in the car the ECM was installed and when I went to crank the car nothing happened. I have dash lights, headlights, door locks work, rear windshield wiper works but the front wipers do not. I took the starter back off and used the jumper cables to tell if the solenoid would work and it does. When I reinstalled it on the car the purple wire has no power running through it. I'm read a few things about the BCM going bad but not really sure that is my problem. I finally got a code on it and it was U0102 which is lost communication with transfer case control module. any help would be great appreciated.

    2007 Chevrolet tahoe
    5.3 L Vortec
    z71 4 wheel drive
    flex fuel
    U0102 Lost Communication with Transfer Case Control Module (TCCM)

    Read more at: https://www.obd-codes.com/u0102
    Copyright OBD-Codes.com
    U0102 Lost Communication with Transfer Case Control Module (TCCM)
     
  2. Rocket Man

    Rocket Man Sometimes A Dumbass Supporting Member

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    I would pull the ECM back out and double check the connectors for a bent pin or corrosion. Who did the programming? Can you take the ECM back to have it checked for problems?
     
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  3. swathdiver

    swathdiver Full Access Member

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    Welcome Charlie, definitely double and then triple check all of your electrical connections and grounds. An advanced scan tool like the Tech2 is indespensable in solving these kinds of problems, more important than a wrench.

    What camshaft did you go with?
     
  4. kbuskill

    kbuskill ***CAUTION*** I do my own stunts!

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    Check starter fuse 62... 40Amp. If it's good proceed.

    Check the YEL/BLK wire going into the underhood fuse block for the starter relay pin 86 for power. If it has power, swap with a different relay and try again. If no power on pin 86 proceed.

    Check the ORG/BLK wire from the Park/Neutral safety switch for continuity to ground.

    If all these check ok then my guess would be bad BCM.
     
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  5. tex96

    tex96 TYF Newbie

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    went back through all the connections and everything looks good. Only thing is I do not have power to the starter wire. The place where I got the ECM reprogrammed at is think it is a bad BCM. The battery was unhooked for a week, could we have lost programming to the BCM? If so how do I fix it.
     
  6. kbuskill

    kbuskill ***CAUTION*** I do my own stunts!

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    Check everything I posted above before condemning the BCM.
     
  7. sfc_jones

    sfc_jones Member

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    You really need a Tech2 to see if it can communicate with the bcm and the ecm for that matter
     
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