Need help…..RESOLVED

MSU120 · 08-30-2021, 09:01 PM

I recently had a cam/heads build completed. The engine was pulled to complete the project. Everything was good for about 2 months when out of no where, my tech stated bouncing erratically. Car ran fine and continues to run fine but now the tack bounces non stop. I also have the following codes:

U0126
U0136
U0151
U1833

The shop checked the 3 grounds on the engine and said all appeared good. I believe this is a ground issue but I have no idea where. Does anyone have any suggestions? Is there a particular ground location or harness that would affect the modules related to those codes?

el_d3sconocido · 08-31-2021, 08:56 PM

Check the wiring around your headers, you may have a melted wire. This post had similar issues and a melted wiring harness was the cause:

https://www.camaro6.com/forums/showthread.php?t=589245

laynlo15 · 09-01-2021, 07:26 AM

Wow, we just went thru this on a 16 SS Camaro that my buddy installed a P1 SC on. However his had a miss before he did the install. After the install he still had one and we decided it had to be plugs and wires. He replaced those but still had a miss so we couldn't finish the tune. He decided he'd replace the springs, pushrods just to make sure he didn't have a broken spring. That didn't work either so he just had a feeling it could be a ground so he builds chassis for a living and had a ground kit laying around so he ran a new ground up front on the passenger side and it quit missing so we could finish the tune.

MSU120 · 09-01-2021, 07:18 PM

That harness by the headers was relocated during the rebuild and is not near the headers. It’s actually behind the coolant reservoir. I’m at a loss.

MSU120 · 09-05-2021, 06:07 PM

I just looked again. The ground wire on the front cylinder head has a gouge in the rubber sleeve causing copper wire to be exposed. Could this be the issue? With the procharger on, I can’t reach the wire to re-wrap it and test it.

Thank you.

SSDan · 09-06-2021, 07:00 AM

Add another ground cable. It has helped numerous people not only with a slow crank on a hot engine but also those with a bouncy tach and other weird electrical problems. This link has a lot of detail and describes several ways to add another ground cable: https://www.camaro6.com/forums/showthread.php?t=586153

Its worth a shot as its cheap and easy to do. Good luck! Keep us posted.

MSU120 · 10-01-2021, 01:40 PM

Well…..the issue is resolved. It was a loose ground (near the alternator). I can’t believe one lose bolt caused so much anxiety.

either way….it’s fixed!

08-30-2021, 09:01 PM	#1
MSU120 Drives: 2018 1SS 1LE Join Date: Jul 2012 Location: Michigan Posts: 287	Need help…..RESOLVED I recently had a cam/heads build completed. The engine was pulled to complete the project. Everything was good for about 2 months when out of no where, my tech stated bouncing erratically. Car ran fine and continues to run fine but now the tack bounces non stop. I also have the following codes: U0126 U0136 U0151 U1833 The shop checked the 3 grounds on the engine and said all appeared good. I believe this is a ground issue but I have no idea where. Does anyone have any suggestions? Is there a particular ground location or harness that would affect the modules related to those codes? __________________ 2018 SS 1LE—707rwhp, 615rwtq 2009 Pontiac G8 GT—605rwhp, SOLD Last edited by MSU120; 10-01-2021 at 04:03 PM.

09-01-2021, 07:18 PM	#4
MSU120 Drives: 2018 1SS 1LE Join Date: Jul 2012 Location: Michigan Posts: 287	That harness by the headers was relocated during the rebuild and is not near the headers. It’s actually behind the coolant reservoir. I’m at a loss. __________________ 2018 SS 1LE—707rwhp, 615rwtq 2009 Pontiac G8 GT—605rwhp, SOLD

09-05-2021, 06:07 PM	#5
MSU120 Drives: 2018 1SS 1LE Join Date: Jul 2012 Location: Michigan Posts: 287	I just looked again. The ground wire on the front cylinder head has a gouge in the rubber sleeve causing copper wire to be exposed. Could this be the issue? With the procharger on, I can’t reach the wire to re-wrap it and test it. Thank you. __________________ 2018 SS 1LE—707rwhp, 615rwtq 2009 Pontiac G8 GT—605rwhp, SOLD

09-06-2021, 07:00 AM	#6
SSDan Drives: 2016 1SS 6MT NPP Join Date: Feb 2010 Location: Lake Murray, SC Posts: 2,261 View My Garage	Add another ground cable. It has helped numerous people not only with a slow crank on a hot engine but also those with a bouncy tach and other weird electrical problems. This link has a lot of detail and describes several ways to add another ground cable: https://www.camaro6.com/forums/showthread.php?t=586153 Its worth a shot as its cheap and easy to do. Good luck! Keep us posted. __________________ 2016 Camaro 1SS Hyper Blue 6MT NPP 2010 Camaro 2SS Cam/Headers/CAI/3.91 gears 476 rwhp/440 rwtq (sold)

10-01-2021, 01:40 PM	#7
MSU120 Drives: 2018 1SS 1LE Join Date: Jul 2012 Location: Michigan Posts: 287	Well…..the issue is resolved. It was a loose ground (near the alternator). I can’t believe one lose bolt caused so much anxiety. either way….it’s fixed! __________________ 2018 SS 1LE—707rwhp, 615rwtq 2009 Pontiac G8 GT—605rwhp, SOLD

08-31-2021, 08:56 PM	#2
el_d3sconocido Drives: 2018 ZLE Join Date: Sep 2019 Location: TX Posts: 18	Check the wiring around your headers, you may have a melted wire. This post had similar issues and a melted wiring harness was the cause: https://www.camaro6.com/forums/showthread.php?t=589245

09-01-2021, 07:26 AM	#3
laynlo15 Drives: 2022 Lt1 A10 Join Date: Nov 2015 Location: clark, mo Posts: 8,882	Wow, we just went thru this on a 16 SS Camaro that my buddy installed a P1 SC on. However his had a miss before he did the install. After the install he still had one and we decided it had to be plugs and wires. He replaced those but still had a miss so we couldn't finish the tune. He decided he'd replace the springs, pushrods just to make sure he didn't have a broken spring. That didn't work either so he just had a feeling it could be a ground so he builds chassis for a living and had a ground kit laying around so he ran a new ground up front on the passenger side and it quit missing so we could finish the tune.

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