pcm "updates''

midtime · 10-15-2008, 08:05 AM

New to forum, & have aquestion that dealer can't (or won't) answer. I have 07 Classic GMC SIERRA DURAMAX & the check engine light came on. Took it to the dealer & they found the EGR motor was bad. I got the truck back & looked on work order only to find they had "updated" the PCM & did a transmission recall that also involved a computer update. The truck has a lot less power now. Dealer says updates should not have done anything to reduce power, althogh they don't know exately what the update was. Anyone else have the same experience?

bpick24 · 10-15-2008, 08:45 AM

On the repair order see if it says update per bulliten # or recall # and look it up on the internet or pm me the tsb or recall number should be on the repair order.
Ben

midtime · 10-15-2008, 10:14 AM

No numbers. Just says perform pcm updates.

oleblacky · 10-15-2008, 02:10 PM

They updated mine then the fuel mileage went to crap.

Killerbee · 10-16-2008, 08:16 AM

happens time and again. Take matters into your own hands...EFILive. Log to determine if EGR is sticking open. Then tune it to YOUR specs.

**Tow Master** · 10-17-2008, 01:08 AM

I have had heard that before but Im not sure why. I had my ECM updated when I first got it and there was no difference.

Hmm.. Id try unhooking the batterys. Maybe it will reset something.