Do not attempt to do this on either an 06 LLY or LBZ. These new computers are locked and will burn up if you try to update it. I was having some work being done at the dealer ( my buddy is a tech), and I asked him to see if there were any updates for the LBZ. Well the computer showed a few of them so we figured we'd might as well upload them to the truck ( let me remind you that nowhere during this process does it tell you that you can not reprogram these PCM's). Well we tried to load the new software but it kept failing, and after awhile of research we found out about the new computers and then came to realize that my PCM was indeed fried and I was going to need a new one. Kind of ****ty but the Techs there were upset because non of them had heard about the new computer not being able to be updated because they had updated alot of Dmax's in the past. Just wanted to give you guys a heads up. Oh and ever since Delphi went bankrupt, its not too easy to get a new PCM. I could be down for at least a week.

:badidea:

Man, that sux..:eek: ....Thanks for the heads up. Hope they get you back on the road soon.

A couple comments:

Why would GM make PCM updates available for the TechII if they made the PCM so it can't be written to?

If the PCM is indeed not writable, then there goes any chance of a flash program such as the Predator.

I'm guessing something else went bad during your attempt.

My .02

The early 24V CUMMINS engines had this problem. The ECM's were flashable, they were just having solder failures internally in the ECM's in the IP chip. They would erase fine, but they wouldn't reprogram. I bet it isnt a problem of not being able to flash(since I'm sure GM flash's them when they build them), but they're probably having some other problem. Let me ask you this, why would an update be available for a non programable ECM?

I think it was PIP3555. If you can read that then you'll know what I am talking about.

Was your friend using the CANDI module? The 06's require that to communicate with the Powertrain, but it may be possible to download the PCM info to the TECH II using SPS and over write it with TIS. When it is then downloaded back to the truck I could see where it would corrupt the PCM.

He wasn't doing anything different then he would on say a LLY.

He wasn't doing anything different then he would on say a LLY.

DIRTDOG appears to have found your problem. IIRC others have posted recently that the CANDI module must be used on the 2006's. If he's not doing anything different than on an '05 LLY then he's not using the required module.

Will the CANDI module be needed for when I go to have them program the radio for the lux amp?

I don't know for sure on the pickups, I'm more familier with the Medium Dutys, but from my limited "play time" with the 06's, it appears that you can access and do most everything chassis and body related on the 2006 C4/C5 without the CANDI module, but not the Powertrain. It looked like it would allow you to download to the TECH II with the SPS, but what info you would actually get is the question. Did the Tech have a small (6"x8"x1") grey box attached between the TECH II and the vehicle? You don't need the CANDI module on the 2005 LLY's so he might not have used it.:badidea:

If the Tech tried to over write what ever information was copied to the TECH II with the updates on the Techline and then reflash the truck, it is hard telling what you would get. Unfortunately very possibly a fried PCM. It might be salvagable if you could completely over write the PCM using the CANDI module, but you are treading on uncharted ground here, so you will be the test case. :help2:

Good luck and let us know what happens.

You need the Candi to even view the current calibrations of the PCM... Otherwise you just get a "No Communication" message. I have had alot of programming errors due to Candi modules sucking ass, and even locked up 2 brand new 06 TCM's before the Candi would finish programming one. The problem lies within the Candi module, not the PCM. I have complained to GM about the Candi issues, but it hasn't done any good...

alright iam new at this stuff can someone explain to me what in the world is PCM and how do you update your computer... what does updating do to it?? KEEP IN MIND IAM NEW THIS IS MY FRIST DIZZLE TRUCK!!

I don't think your dealer knew what he was talking about...

I had my Truck in for a Clogged Fuel Filter about 3 weeks ago and they applied a new software upgrade to my lbz w/o issues...

If the PCM is indeed not writable, then there goes any chance of a flash program such as the Predator.
:confused::confused:
I just installed the Bullydog Pup Performance tune last night.

The Tech-II requires the CANDi module to properly interface to the truck. That could be the problem.

One thing about your dealer is they must not be to sharp as the ECM in an '06 is not a Delphi unit. All 2006 Duramaxes use a Bosch ECM in them. The TCM (Allisoncontroller) is a Motorola unit so Delphi has none of the business on these truck when is comes to the powertrain controllers. I think I would find another dealer to work with in the future.

You need the Candi to even view the current calibrations of the PCM... Otherwise you just get a "No Communication" message. I have had alot of programming errors due to Candi modules sucking ass, and even locked up 2 brand new 06 TCM's before the Candi would finish programming one. The problem lies within the Candi module, not the PCM. I have complained to GM about the Candi issues, but it hasn't done any good...

Roger that, I too have had problems re-programming when using the Candi module. I was to the point where if it locked up or could not finish, it didn't surprise me.

We were indeed using the CANDI module last night. GM has told us this morning that there is a problem with it, but they have nothing available to fix it at the moment. Looks like I need to wait for the new PCM to arrive.

Out of 5 Tech 2's and 3 Candi modules that we have, we narrowed it down to one combination of the two that fails the least. Pretty sad really, but GM doesn't seem to care. Tech 2 calibration versions don't seem to matter either.

Yeah I see that. They told me 1st that they would be overnighting a new ECM, then they called back and said it would be on backorder and it could take 24hours or 24 years. They couldn't tell me when to expect it.

Got the truck back just now. We put an ECM from another LBZ in my truck to get me on the road until my new ECM comes back. Anybody elses truck smoke at idle??

Anything involving the MY06 LLY/LBZ or Alliison transmission needs the CANDI module along with the TECH II. This is because both are on GMLAN, which is new for MY06.

He may still be able to recover your ECM if he can get the CANDI module.

Got the truck back just now. We put an ECM from another LBZ in my truck to get me on the road until my new ECM comes back. Anybody elses truck smoke at idle??

For a short time mine was smoking at idle, especially warm up, really bad at warm up! It has not happened since I have been using Stanadyne. But I cannot say this made the difference. I am going to take a break from the additive for the next few fill-ups and see if it starts smoking again. Maybe it was the fuel, who knows.

Other than some smoke, I had no other symptoms that would lead me to be concerned. There was no rough idle, no odd noises, no hesitation or balking, nothing. Fuel mileage and performance were good, too. And I didn't mind the smoke so much...I thought it looked pretty sweet pouring out of the exaust. In fact, wish I had duals when it was smokin' like that.

But now it's just a boring, non-smoking LBZ like its supposed to be...okay, so it isn't boring, just non-smoking.

Mine smokes after a long idle and you start driving again. Haven't notice any smoke while just sitting there idleing.

It was idleling after a short drive and it was smoking some, not a lot, but def. noticable. Machinator, we were using the CANDI module if you read the previous posts. GM admits to having the calibrations all screwed up. They have had at least 3 dozen of these problems so far. The only reason I was looking for the update was to see if there was anything concerning my horrible fuel mileage, as well as the smoking at idle.