Before I say a thing about my 18 GMC 3500 I will explain my first experience with a duramax. I am not a big complainer and I loved my 05 Chev 2500 LLY. I loved it even though I had many issues with it. Injectors that were under warranty, blown head gaskets that left me and my family stranded in Richfield Utah for 7 days, a blown transmission (mostly my fault cause I was hard on it), and the day after I sold it to a cousin a seized oil pump that starved the turbo and destroyed it. In all spent some big bucks on that truck but I really enjoyed that truck.
The L5P I would gladly give back to the dealer. Many minor things that are not worth complaining about here but the transmission shifting alone drives me completely nuts!!! This tcm is not programmed well at all. It amazes me that GM would deliver a vehicle like this. Slipping at low speed, erratic shifting, long gaps in shifts (35-45mph), harsh down shifts (almost like the trans is in relearn). Love the 6 speed though 🙂 makes all the difference on hwy vs my old 5 speed.
Dealer tried to duplicate but if course couldn't and even told me that it must be because I drive my truck hard which is not the case. I baby my new $60k truck. I want it to last. These issues of course happened the next day after getting my truck back from the dealer. Haven't towed yet with 4500 miles. Horrible mpg... But big power is good 🙂
I really hope GM puts out a fix for this trans.
I've been a GM fan starting with my 98 Silverado. Trusted that this would be a solid truck. Now I am regretting the purchase.
REAL TRUCKS HAVE GLOW PLUGS!
2005 2500HD LLY EC SB
EFI Live w/DPS5, Suncoast Gmax and Goerend Triple Disk w/Billet Stator (Mike L), Edge CTS, 4" Straight Pipe, S&B Intake, Leveled w/Bilstein 5100, Cognito Pitman/Idler Support, HD Tie-rods