Need a shop that specializes in LS wiring/TCM/ECU. Willing to travel anywhere!!

2804 Views 20 Replies 11 Participants Last post by ricemb, Mar 3, 2022

ctsb

Discussion Starter · Feb 26, 2022

Long story short, I need a shop that can track down whatever issue is causing my car to lose communication between the tcm/ecu halfway through dyno pulls while tuning.

I don’t want to go down the rabbit hole here of what could be causing the codes, I just want to take it to a shop that can track down what’s going on. I will however post the codes so you can direct me to the best shop that can help track it down. Unfortunately the tuning shop I go to just doesn’t have the time or bandwidth to track down the issue.

I am in California but willing to take the car anywhere in the country to a shop that can get me squared away.

I’m guessing it’s anything from a bad ground, to a bad wire connection, the way the fuel system might be wired, Or something stupid along those lines but I just do not have the ability to dive into the problem myself and neither does the tuning shop.

the car drives and throws no codes while driving around the shop but as soon as it gets on the dyno to finish the tune, it looses communication halfway through the pull and throws the codes I’ve shown in the picture below. I have already switched both the tcm and the ecu and it’s still happening so I don’t think that’s the issue. This has been beyond frustrating because the finish line is right in front of me but the gremlins just keep coming. The car is making 900 rwhp at 5200 rpm which makes this even more frustrating as I can’t wait to see the final numbers. But like clockwork the car misses halfway through the dyno and throws the codes below.

any help with a shop recommendation is greatly appreciated

for info car is a 427 with a Kong blower, fore triple pump system and all the needed accessories (trunk ice box, nitrous system, etc)

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loweredd

· #2 · Feb 26, 2022

U0101 - TCM not communicating - 2010 CTS-V

Code U0101 came up today while I was working on buttoning up a twin turbo build. I poked around with HPTuners to see if I could read the TCM but it says "Requesting access.....Connection Timed Out..........FAILED" and I can't get it to connect. Communication with the ECM works fine (Read and...

forum.hptuners.com

@theheder had this issue......needed the fuse block, but then it did it again, but ended up being something else, maybe???

P0606 code and limp mode GM LS3 525hp crate motor

Just to provide some background, a guy in my town that owns a performance shop and does LS swaps asked me to come tune this car for him. I'm still fairly new to tuning and he knows that. The vehicle is a 54 chevy pickup that has a brand new GM LS3 376/525 crate motor in it. The guy bought his...

forum.hptuners.com

this got goofy P0606 from throttle settings being off.

www.ctsvowners.com

No gear input and other problems

I am super close to getting this car on the road after a long journey. I have a few problems with "charging system" but that seems to be intermittent right now and not too worried about that. What I am needing some feedback on before I decide to tow the car to the dealership for a real scan. I...

www.ctsvowners.com

www.ctsvowners.com

@g9s8r had a U0101 and P0602 and needed the TCM programmed?

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ctsb

Discussion Starter · #3 · Feb 26, 2022

loweredd said:
U0101 - TCM not communicating - 2010 CTS-V

Code U0101 came up today while I was working on buttoning up a twin turbo build. I poked around with HPTuners to see if I could read the TCM but it says "Requesting access.....Connection Timed Out..........FAILED" and I can't get it to connect. Communication with the ECM works fine (Read and...

forum.hptuners.com

@theheder had this issue......needed the fuse block, but then it did it again, but ended up being something else, maybe???

P0606 code and limp mode GM LS3 525hp crate motor

Just to provide some background, a guy in my town that owns a performance shop and does LS swaps asked me to come tune this car for him. I'm still fairly new to tuning and he knows that. The vehicle is a 54 chevy pickup that has a brand new GM LS3 376/525 crate motor in it. The guy bought his...

forum.hptuners.com

this got goofy P0606 from throttle settings being off.

No gear input and other problems

I am super close to getting this car on the road after a long journey. I have a few problems with "charging system" but that seems to be intermittent right now and not too worried about that. What I am needing some feedback on before I decide to tow the car to the dealership for a real scan. I...

www.ctsvowners.com

@g9s8r had a U0101 and P0602 and needed the TCM programmed?

ya, I saw all those threads and that’s exactly why I want to just take it to a shop that can troubleshoot it. I don’t have the time or capacity to personally dive into it and unfortunately neither does the tuning shop. So any shop recommendations are greatly appreciated. I’ll let the experts handle it. I can’t just start throwing parts at the problem having no idea where to even start.

theheder

· #4 · Feb 26, 2022 (Edited)

Resolving mine was a long painful journey. There were quite a few theories triggering me to check / swap out a list of things.

Not sure why yours does it only on the dyno. Mine was stuck in limp mode all the time and the dash was lit up with just about every light possible.

I can't recommend a shop as I didn't use one. I worked through mine on my own as mind boggling as it was.

I know that you said don't want to try to fix it yourself but I will toss out a couple of easy peasy things to look into. You might get luckier than me.......

Check the TCM connector plug and ensure that it all the pins are clean, fully seated and the twist on plug is tightly locked on. A small amount of dielectric grease in there is a good idea.

Check the resistance on the CANBUS at the DLC (under dash obdii port). IIRC probe pins 6 (12v) and 14 (ground) with the battery disconnected for a few minutes. If it is good to go there should be 120 ohms of resistance. Anything less or more will cause weird communication issues with the modules.

You could also check the group of wires that run from the TCM connector up on top of the transmission up to the firewall and into the ECM wire bundle on the passenger side for rubs, pinches or burns from the exhaust.

For what it's worth - I also have a Fore fuel system and Nitrous Outlet setup.

Good luck figuring it out.

Electrical issues can be a PITA. I found out and confirmed that the hard way.

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loweredd

· #5 · Feb 26, 2022

ctsb said:
ya, I saw all those threads and that’s exactly why I want to just take it to a shop that can troubleshoot it. I don’t have the time or capacity to personally dive into it and unfortunately neither does the tuning shop. So any shop recommendations are greatly appreciated. I’ll let the experts handle it. I can’t just start throwing parts at the problem having no idea where to even start.

Gotcha. I didn't know if you wanted to look at a few things yourself before having to take it somewhere.

RobF300

· #6 · Feb 26, 2022

Dave Steck DSX tuning is a genius, dont know if Matt GP tuning gets into wiring as much but maybe as them

ctsb

Discussion Starter · #7 · Feb 26, 2022

Appreciate the input so far. Please keep the shop recommendations coming so I can reach out to them to get this thing squared away. Thank you all in advance.

PGA2B

· #8 · Feb 27, 2022 (Edited)

DSX Tuning (Dave is awesome)

If you don't want to go half way accross the country in Phoenix is Cordes Performance Racing

Reactions: 1

ctsb

Discussion Starter · #9 · Feb 27, 2022

Thanks I messaged Dave on IG and have also reached out to grieve in Texas and cordes as well. Keep throwing the shops my way. I honestly will take the car to China to get this done at this point. Whoever can get it done the right way can absolutely have the business.

Reactions: 1

random84

· #10 · Mar 1, 2022

Can you share your build (pulley ratio, heads, etc)? Sounds sick!

Sent from my SM-G991U1 using Tapatalk

Blades1_99

· #11 · Mar 1, 2022

Vengeance Racing, is so far away from you but they were the shop to put an LSA in an ATSV.

"Pearl" is a 2011, V Coupe, A6, Recaros, Skyview.

Mods: Airaid - Red filter, Side Swipe, Mamo LS7 Ported TB, ZL1 lid, Fasterproms underhood tank, BMR Catch Can, .... 503whp - 522wtq @ 8 psi boost on 110 Octane
GP Tuning Stg 2 Cam kit with BTR pushrods, springs, timing chain, and trunion upgrade, GripTech 10 bolt 2.45 upper, FIC 1300, WeaponX Track Attack II Heat Exchanger, TSP 2" Ceramic coated w/Hiflow Cats, TR71x, Accel Ceramic wires, DSX 100mm relocated idler, stock IC pump ... 615whp -596wtq @ 10.2 psi boost on 110 Octane... 1/25/20 added DSX flex fuel sensor and CWA 100 IC pump 6/25/20 added ATI Balancer with 8.66 lower. 93 oct 627whp-613tq 40%E blend 652whp-642tq...Xtreme CFM heads Jokerz Supercharger....Feb 25 2021 710whp-645tq on 93, April 2021, DWS 300S, ALM hat, G-force axles on widened coupe wheels 11" running 325s. Sept 2021 swapped to NW 103 with DDP Cold Air Intake System.

Karch

· #12 · Mar 1, 2022

Blades1_99 said:
Vengeance Racing, is so far away from you but they were the shop to put an LSA in an ATSV.

I thought WeaponX did that first?

Sent from my iPhone using Tapatalk

ctsb

Discussion Starter · #13 · Mar 1, 2022

random84 said:
Can you share your build (pulley ratio, heads, etc)? Sounds sick!

Sent from my SM-G991U1 using Tapatalk

427 dart block
Frankenstein 310 heads
Kong 2650 blower
Kong billet lid
3.0/10 pulley but switching to 2.75/10

Reactions: 1

random84

· #14 · Mar 1, 2022

ctsb said:
427 dart block
Frankenstein 310 heads
Kong 2650 blower
Kong billet lid
3.0/10 pulley but switching to 2.75/10

Post up more of the car when you get it sorted. Kick ass!

Sent from my SM-G991U1 using Tapatalk

ctsb

Discussion Starter · #15 · Mar 1, 2022

random84 said:
Post up more of the car when you get it sorted. Kick ass!

Sent from my SM-G991U1 using Tapatalk

thanks Man, so close to the finish line. So damn close. Don’t know how to post videos so here’s a few more pics

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Sudderth

· #16 · Mar 1, 2022

Ivan Temnykh
[email protected]
814-380-1327

This guy, Ivan, knows his stuff. working to resolve an issue on my sons Chevy SS and he had it resolved. Has a YouTube channel and is really good at this stuff.

Vwlove56

· #17 · Mar 1, 2022

So I’m wondering if it may be in the OBD connection since it only happens on the dyno and those codes? Just a thought…

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Reactions: 1

loweredd

· #18 · Mar 2, 2022

Oooh. That's a good idea.

ctsb

Discussion Starter · #19 · Mar 2, 2022

Well not that it’s going to be the answer, but discovered that the car had the 15 inch conversion including menscer shocks installed without the mag delete sensors. I really didn’t even know about those but apparently it prevents the car from going out 80 mph which might explain why halfway through the dyno pull the car starts throwing these codes.

going to get them ordered and go from there

A check of the CAN showers 61ohms which apparently is within spec so idk

Reactions: 3

loweredd

· #20 · Mar 2, 2022

Getting closer!

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