Question - Swapping ECU between similar vehicles

Reprise

Original poster
Lifetime VIP Donor
Supporting Donor
Member
Jul 22, 2015
2,724
I have a limeswap-modified ECU on the one '03 Sierra that I plan to sell.

Realized a couple of days ago that rather than just give that tune away, I could keep that, and swap it to the new truck (same year, same model, same engine - different VIN, of course). Would save me the trouble/expense of getting it redone, if I could swap it.

Only difference between the two is the Quadrasteer, 4x4 and rear axle.

I do have the Tech2, so I should be able to make any needed changes (although most -- if not all -- of what's different, s/b in the BCM, IIRC).

Anything I need to worry about here, or just swap with impunity?

Appreciate responses, and apologies if this was 'obvious' - just wanted to check.
 

Matt

Member
Dec 2, 2011
4,019
I would think you'd be able to just swap it and change the VIN, rear axle ratio...not sure if the 4x4 would be an issue. You could hit up Jeremy and ask.
 
  • Like
Reactions: Reprise

Mooseman

Moderator
Dec 4, 2011
25,257
Ottawa, ON
Swapping the VIN in the PCM via the Tech 2 probably would wipe out the existing tune and bring it back to stock. You should be able to use it with just a security relearn. The other options are controlled by the BCM and other modules so no worries there. Only thing though is the gearing and speedo output.
 
  • Like
Reactions: Capote and Reprise

Reprise

Original poster
Lifetime VIP Donor
Supporting Donor
Member
Jul 22, 2015
2,724
Appreciate the info, guys. I actually thought it might be plug-n-play - what I'm hearing here suggests that there would actually be some changes. I'll research this a bit online and perhaps drop Jeremy a line, like @Matt suggested.

In light of the answers...glad I asked! :tiphat:

It's gonna be at least a few days until I'm ready to swap - but I'll try and remember to come back here and detail what had to be done to make it 'successful'. Since the two trucks are same year / model / motor, I don't see the point in sending out a *third* ECM to be tuned! LOL
 
  • Like
Reactions: Matt

Forum Statistics

Threads
23,272
Posts
637,482
Members
18,472
Latest member
MissCrutcher

Members Online