07 Avalanche won't start after tune (not the battery)

Diesel666 · Post by **Diesel666** » Wed Nov 14, 2007 8:47 pm

Hi All, HELP!!!

I have a huge problem. I bought a new U7194 (v.8r06) today for my 07 Avalanche 6.0L (VIN's 8th digit is Y) . I removed the OnStar and Audio/Amp fuses as the pre-2007 model instructions said to do. The install seemed to go ok. I did the original backup, then did the 87 tune......

When it came time to start the truck. Just click click click from around the fuse box. When I plugged the unit back in, it does not read my vehicle anymore so I can't start it and I can't put it back to original.

I charged the battery to make sure it wasn't depleted and it still won't start.

Post by **06MonteSS** » Thu Nov 15, 2007 1:10 am

the only fuse you need to pull is the one for onstar...

right now, try disconnecting your negative battery cable... wait about 15 minutes and then re-connect it... then try starting your truck...

sickREDsierra · Post by **sickREDsierra** » Thu Nov 15, 2007 8:56 am

yeah buddy, mine did the same crap!! i think i was sold a bunk unit. i plugged in, did everything as per the manual, and it didnt read my vehicle... my truck wouldnt start....wouldnt even click, my heart dropped!! i was in the parking lot of ups where i just took it out of the box, so i had to disconnect the battery and let the factory comp reset itself. i shipped that badboy back that day, so i got a new one coming friday.

what can you do? unlucky i guess.

Diesel666 · Post by **Diesel666** » Thu Nov 15, 2007 9:24 am

Unplugged the battery for 20 minutes and still nothing

sickREDsierra · Post by **sickREDsierra** » Thu Nov 15, 2007 10:12 am

damn! may have fried the factory computer? i have read a few of these post, all about the 07 new body style with 6.0.
it seems the factory ecm's maybe junk? i read one post where a guy had this happen three times, and towed to the dealer and replaced the computer in vehicle three times.... i never read a solution to the problem though.
good luck fella, maybe gm will sort it out if it is a factory computer problem.

Post by **06MonteSS** » Thu Nov 15, 2007 10:26 am

yep... could be facing a tow to the dealer...

however, first - call Mike from Diablosport here:

Mike Litsch
Diablosport inc.
561-908-0040
mlitsch @ diablosport.com

he may be able to help you force the original tune back to the ECM and that may fix it...

if HE can't get it to work, then you're SOL and will have to get it back to the dealer to get a new replacement ECM...

Diesel666 · Post by **Diesel666** » Thu Nov 15, 2007 11:11 am

Just got off the phone with a Phil. He told me to have it towed to a dealer to have it reflashed then to call him back to reset the tuner. He did not think anything was wrong with the tuner itself.

I am really worried about reinstalling it and having it crap out my truck again.

Post by **06MonteSS** » Thu Nov 15, 2007 11:20 am

Phil's a new guy... should'a asked to talk to Mike and try the force original backup first... cuz if that works, it saves ya a tow to the dealer and explaining things to them.... and if it doesn't work, then you still have to tow it there anyway, so nothing lost by trying the force backup first anyway...

69Zeleven · Post by **69Zeleven** » Thu Nov 15, 2007 7:22 pm

Exact same thing that happened to me! Had to be towed in, new PCM installed. The tech guys cannot reset it when this happens. Diablo says they are aware of the problem and working to fix it.

WARNING! DO NOT CONNECT YOUR U7194 TO A 2007 6.0L AVALANCHE!

Post by **mikel** » Thu Nov 15, 2007 7:36 pm

We are currently working on a new revision to fix any of these types of issues.

Thanks

69Zeleven · Post by **69Zeleven** » Tue Nov 20, 2007 10:31 pm

Ready and waiting.

rlujan · Post by **rlujan** » Mon Nov 26, 2007 1:41 am

I have a 2002 Silverado 6.0l and had the same problem you are having. Going through these forums, Is seems this is a very common problem. I installed this tuner in my truck at the Summit Racing parking lot. After not starting, I had to have it towed to the dealer. The tech could not communicate with the PCM and I had to buy a new one( $513.00). After the repair is when I emailed Diablosport. This is the information I received from the so-called expert Mike Litsch: ( There is a lisence agreement in the first page of your owners manual stating
that we are not responsible for anything that may happen as a result of
using our product.
I assumed we spoke on the phone, as anyone I speak to I do offer our
services to reflash the PCM, but I may not always get into that on the
forums.
Rather than look for reimbursement, why not send me the PCM so we can
reflash it and you can go back to the dealer with the PCM in working
condition and have them reimburse you for overcharging you for a part that
you did not need.
I am sorry that you were taken advantage of by the dealer, but it is out of
our hands.
For more info on our warranty please email [email protected])

After reading the complaints in these forums about the turnaround time on repaired PCMs from Diablosport, I had no choice but to go to the dealership.

Save yourself the headache, get your truck fixed, and please spread the word about this product. P.S. I showed all my emails to the manager at Summit Racing, and he said he is going to tell all his sales reps to stay away from this brand of tuner. Good luck!

69Zeleven · Post by **69Zeleven** » Tue Nov 27, 2007 4:12 pm

There is definitely a serious issue with this combination. This is the third Predator I've owned, fixes have been promised, so I'll wait a bit longer and see how they handle this.

07 Avalanche won't start after tune (not the battery)

07 Avalanche won't start after tune (not the battery)

RE: 07 Avalanche won

RE: 07 Avalanche won