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Discussion Starter · #1 ·
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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@theheder had this issue......needed the fuse block, but then it did it again, but ended up being something else, maybe???


this got goofy P0606 from throttle settings being off.


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

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Discussion Starter · #3 ·

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


this got goofy P0606 from throttle settings being off.


@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.
 

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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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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.
 

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

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Discussion Starter · #7 ·
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.
 

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DSX Tuning (Dave is awesome)

If you don't want to go half way accross the country in Phoenix is Cordes Performance Racing
 
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Discussion Starter · #9 ·
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.
 
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Can you share your build (pulley ratio, heads, etc)? Sounds sick!

Sent from my SM-G991U1 using Tapatalk
 

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

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Discussion Starter · #13 ·
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
 
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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
 

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Discussion Starter · #15 ·
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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Discussion Starter · #19 ·
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
 
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