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Discussion Starter · #1 ·
Took my 02 lb7 Silverado in for a fluid change.
Less than 20 miles later I am dead on the side of the road !!

My truck has never let me down before, and hasn't thrown a code in years.
I was headed out on a 1500 mile trip and wanted to get ALL my fluids changed
but didn't have the time to do it myself.

I took it to a repair shop I trusted (and has a good reputation) to change the fluids

Front and rear differentials
Transfer Case
Transmission pan dropped and both filters replaced
Oil and filter
power steering fluid
Fuel filter
(brakes were recently done, and just fine)

I also wanted the air conditioner charged.

The air conditioner gave them fits - they could not get the compressor to turn on.
They decided to re-flash the ECM.
The AC started working, but the truck immediately started throwing codes.

I have EFI live tuned in my truck, so I had them replace tune #5 with the stock tune.

Now the shop want to sell me a $1000 TCM - they just don't know what is wrong.
I tell them I do not believe this is the problem as I have never had any issues until
the day they re-flashed the ECM.

Nobody in this town has the knowledge to trouble shoot this issue.
I think the re-flash screwed something up.

Anybody have any other ideas?

Thanks, Roy
 

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The shop couldn’t have replaced tune 5 with a stock tune, unless they are the shop that originally created the custom calibration. They probably flashed in the stock file, and your other custom calibrations are gone. What year truck do you have, and what modifications are done to it? Do you have any way of flashing the custom calibration back into it?


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Did they know your ecm had aftermarket calibrations in it? Was the a/c not working because of the aftermarket calibrations? What exactly does dead on the side of the road mean?
 

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Discussion Starter · #4 ·
The EFI Live tune installation included a dash mounted switch. When the ECM was re-flashed, the switch was set to
position 5, so that is the position of the new re-flashed data. The other 4 tunes are still in the positions that they were.

Apparently, when I bought the EFI Live tunes, they screwed up on the year 2003 versus 2002, which is what it should have been. Everything worked fine except the AC would not turn on.

20 miles from the repair shop I had to stop for a traffic signal. The "Service engine light" came on and the transmission
would not engage, 95% slippage. Just enough engagement to pull to the side of the road.
 

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That’s not the way it works. You can’t reflash only one position on the switch. If that’s what they’re telling you, they have no idea what they’re doing.


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Discussion Starter · #6 ·
Nobody seems to have any idea what needs to be done.

Why wouldn't re-flashing just one tune work?
You sound pretty sure what they did won't work, but can you please explain?
 

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Even tho there are 5 selectable positions, or “tunes”, they are loaded onto the ECM with 1 file. Think of it kinda like using your tow/haul button. Calibration parameters change as you change between switch positions.

You never answered my question about any performance mods done to the truck.

Did your originally install the EFILive calibration on the truck? If you did, reinstall that calibration, and more than likely your issues will go away. If you didn’t, you need to find out who did, and get them to reflash the ecm. That’s where you need to start.


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Discussion Starter · #8 ·
The only mods are a 4" stainless exhaust and a bank air intake.

I did not do the EFILive installation - and the guy that did it is long gone. It has been many years.

How do I recover at this point?

Is EFILive still available for purchase anywhere?
 

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I am guessing you’ll need to buy a new set of calibrations for the truck. Extremely hard to track down tunes, without having info from the previous owner.


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Have you checked for codes? That might help diagnose what’s going on as well.


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Took my 02 lb7 Silverado in for a fluid change.
Less than 20 miles later I am dead on the side of the road !!

My truck has never let me down before, and hasn't thrown a code in years.
I was headed out on a 1500 mile trip and wanted to get ALL my fluids changed
but didn't have the time to do it myself.

I took it to a repair shop I trusted (and has a good reputation) to change the fluids

Front and rear differentials
Transfer Case
Transmission pan dropped and both filters replaced
Oil and filter
power steering fluid
Fuel filter
(brakes were recently done, and just fine)

I also wanted the air conditioner charged.

The air conditioner gave them fits - they could not get the compressor to turn on.
They decided to re-flash the ECM.
The AC started working, but the truck immediately started throwing codes.

I have EFI live tuned in my truck, so I had them replace tune #5 with the stock tune.

Now the shop want to sell me a $1000 TCM - they just don't know what is wrong.
I tell them I do not believe this is the problem as I have never had any issues until
the day they re-flashed the ECM.

Nobody in this town has the knowledge to trouble shoot this issue.
I think the re-flash screwed something up.

Anybody have any other ideas?

Thanks, Roy
Crappy aftermarket tuners who dont understand how to work with the J1939 bus on the vehicle and it is sending out signals that is confusing things and throwing codes.
 

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Like matt said, thats not how efi live works. They flashed a stock file over yours which im guessing is the wrong os for your truck and they probably used a tech 2 which will cause issues on alot of lb7s once theyve been flashed with efi. I really doubt its the tcm. You are going to have to have someone else flash it with the correct os with efi live and if its locked you will need a new ecm.
 

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If it’s a possible cal/ecm issue, which I am not completely following where this thing truly is yet as far as diag but whatever, then I would for sure grab another ecm, flash stock cals in it, make sure the TCM is factory cals and try it.
 

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Discussion Starter · #14 ·
OK guys, got it figured out.

Got my truck back today. Repair shop had put the wrong filter inside the transmission. With the right filter, magically the codes stop and it drives great again. The filter we took out had a second screened opening near the mounting tube.

When we put the correct filter (used the correct gm p/n for a 4500 or 5500 truck) everything works again.

I was pleased with all the help offered here.

Thanks to Dynamic Calibration in Sparks, Nevada, Mike and his crew were most knowledgeable and extremely helpful.

Thanks everybody, my tow rig in back on the road, the fish are no longer safe !! Roy
 
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