Help code u0107??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Bigo Serge · 12-31-2011, 05:24 PM

Sup all,
I'm having trouble gettin my 72 going. We have the 04 Lq4 motor 4L80 trans.

Now I can turn it on but it doesn't do anything when I hit the gas??? It gives me the U0107 code when I scan it. I've researched it on previous post with similar issues and followed everyone's advice.

All grounds are good, pedal and tac module are from the donor truck, harness and computer were flashed and altered by John at Speartech. Im thinking I have a bad throttle body, but I'm not sure. If anyone has any input on this issue it would be greatly appreciated!! Thanks in advance!!

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68GMCCustom · 12-31-2011, 07:22 PM

'04......you have this setup as DBW or cable operated?

Bigo Serge · 12-31-2011, 07:55 PM

Sorry it's a dbw. We checked the throttle body and it works fine. Im wanting to check the pins in the harness, does anyone have the schematics??
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463 · 12-31-2011, 08:18 PM

heres what i was looking at. worth a read http://www.gm-trucks.com/forums/inde...owtopic=114404

Bigo Serge · 12-31-2011, 09:15 PM

Well the way we checked the throttle body was by connecting 12 volts directly to it to see if it opens and closes. Does anyone know the correct way to trouble shoot the dbw throttle body including the throttle positioning sensor??
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clinebarger · 01-01-2012, 01:03 AM

Your PCM cannot communicate with the TAC module or is losing communication.

Ive ran across the code several times, Its always been wiring problems, Mostly the ground for the TAC module, Not a loose connection but a broken wire near the ground connection on the back of the block.

Test for 12 volts on the Pink wire at the TAC module.
Test for ground on the Black wire at the TAC module.

Bigo Serge · 01-01-2012, 04:59 PM

SPECIAL THANKS!!!!!!!! TO CLINEBARGER, YOUR THE MAN!!!!
We tested pink for 12v and we were good. Next we tested solid black for ground and found it we did not have continuity. So we supplied it with ground and fired it up and our surprise......she's rumbling loudly!! AWESOME!!!

The question is now, to what pin does this black wire go to?

Thanks again, it is greatly appreciated, happy new year!!!
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clinebarger · 01-01-2012, 07:57 PM

Quote:

Originally Posted by Bigo Serge

SPECIAL THANKS!!!!!!!! TO CLINEBARGER, YOUR THE MAN!!!!
We tested pink for 12v and we were good. Next we tested solid black for ground and found it we did not have continuity. So we supplied it with ground and fired it up and our surprise......she's rumbling loudly!! AWESOME!!!

The question is now, to what pin does this black wire go to?

Thanks again, it is greatly appreciated, happy new year!!!
Posted via Mobile Device

Your welcome.

The black wire goes from the TAC module to a ground splice (S102, Black arrow) then to a grounding point on the back of the block (G104, Grey arrow). The wire usually breaks near the splice. Here some diagrams to help out.

Bigo Serge · 01-03-2012, 09:07 PM

Thanks again your diagram helped out a lot. I took old blue out on a test run Sunday night!! It runs awesome!!!!!

12-31-2011, 05:24 PM	#1
Bigo Serge Registered User Join Date: Dec 2009 Location: Wichita, ks Posts: 59	Help code u0107??? Sup all, I'm having trouble gettin my 72 going. We have the 04 Lq4 motor 4L80 trans. Now I can turn it on but it doesn't do anything when I hit the gas??? It gives me the U0107 code when I scan it. I've researched it on previous post with similar issues and followed everyone's advice. All grounds are good, pedal and tac module are from the donor truck, harness and computer were flashed and altered by John at Speartech. Im thinking I have a bad throttle body, but I'm not sure. If anyone has any input on this issue it would be greatly appreciated!! Thanks in advance!! Posted via Mobile Device __________________ Pick'em up, lay'em down, Oh Yeahhh

12-31-2011, 07:22 PM	#2
68GMCCustom Truck and auto performance nut Join Date: Feb 2007 Location: McKinney,Texas Posts: 3,848	Re: Help code u0107??? '04......you have this setup as DBW or cable operated? __________________ Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken

12-31-2011, 07:55 PM	#3
Bigo Serge Registered User Join Date: Dec 2009 Location: Wichita, ks Posts: 59	Re: Help code u0107??? Sorry it's a dbw. We checked the throttle body and it works fine. Im wanting to check the pins in the harness, does anyone have the schematics?? Posted via Mobile Device __________________ Pick'em up, lay'em down, Oh Yeahhh

12-31-2011, 08:18 PM	#4
463 Registered User Join Date: Nov 2007 Location: Sask Canada Posts: 1,666	Re: Help code u0107??? heres what i was looking at. worth a read http://www.gm-trucks.com/forums/inde...owtopic=114404 __________________ Trueman

12-31-2011, 09:15 PM	#5
Bigo Serge Registered User Join Date: Dec 2009 Location: Wichita, ks Posts: 59	Re: Help code u0107??? Well the way we checked the throttle body was by connecting 12 volts directly to it to see if it opens and closes. Does anyone know the correct way to trouble shoot the dbw throttle body including the throttle positioning sensor?? Posted via Mobile Device __________________ Pick'em up, lay'em down, Oh Yeahhh

01-01-2012, 01:03 AM	#6
clinebarger Senior Member Join Date: May 2009 Location: Fort Worth, TX Posts: 6,370	Re: Help code u0107??? Your PCM cannot communicate with the TAC module or is losing communication. Ive ran across the code several times, Its always been wiring problems, Mostly the ground for the TAC module, Not a loose connection but a broken wire near the ground connection on the back of the block. Test for 12 volts on the Pink wire at the TAC module. Test for ground on the Black wire at the TAC module.

01-01-2012, 04:59 PM	#7
Bigo Serge Registered User Join Date: Dec 2009 Location: Wichita, ks Posts: 59	Re: Help code u0107??? SPECIAL THANKS!!!!!!!! TO CLINEBARGER, YOUR THE MAN!!!! We tested pink for 12v and we were good. Next we tested solid black for ground and found it we did not have continuity. So we supplied it with ground and fired it up and our surprise......she's rumbling loudly!! AWESOME!!! The question is now, to what pin does this black wire go to? Thanks again, it is greatly appreciated, happy new year!!! Posted via Mobile Device __________________ Pick'em up, lay'em down, Oh Yeahhh

01-03-2012, 09:07 PM	#9
Bigo Serge Registered User Join Date: Dec 2009 Location: Wichita, ks Posts: 59	Re: Help code u0107??? Thanks again your diagram helped out a lot. I took old blue out on a test run Sunday night!! It runs awesome!!!!! __________________ Pick'em up, lay'em down, Oh Yeahhh

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