Last post on May 21, 2013 at 7:22 AM
You are in the Chevrolet Silverado & GMC Sierra
What is this discussion about?
Chevrolet Silverado 1500, Chevrolet Silverado 2500, Chevrolet Silverado 3500, GMC Sierra 1500, GMC Sierra 2500, GMC Sierra 3500, Transmission, Truck
Go to NHTSA to file a safety complaint.
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#1350 of 1487 Re: GM Truck Clunk [bigman55434]
Nov 02, 2012 (11:49 am)
Don't get distracted while driving, however, switch your driver display to "Instant Economy". Watch and feel it in the mid 40's! The annoying lag and growl will coincide with the 5.3 liter 6 speed awkardly trying to figure out "should I be in 6th at 45 mph, or 5th or maybe 4th. 4 cylinders? Maybe 8? Wait a minute, I'll just pick up the slop and BANG"!
The Feds upped the CAFE standards right after the $54 Billion "bailout" (TARP).
Hmmm? General Motors tweaked these things to squeeze out mileage. They appeased the Feds and still haven't paid back the "loan"(to tax payers).
GM kissed.... and politely went along with the CAFE increase (which the car manufuacturers rarely if ever do) and we got stuck with a very confused computer-controlled powertrain/drivetrain combo.
Be prepared. They're pushing for higher CAFE standards in 2017 (I believe in the 40 MPG range!). That means more hoaky tricks to appease. I've had many GMs. This may be it.
Hopefully nobody else gets stuck with one of these things like I and others have.
Thanks GM. You should be proud. You've made the Federal Government happy.
#1351 of 1487 Re: GM Truck Clunk [ceb66]
Nov 02, 2012 (4:16 pm)
I've had many GMs. This may be it.
Yes, please unload it and move on.
#1352 of 1487 New 2012 Sierra Silverado
Nov 03, 2012 (7:18 pm)
Potential General Motors truck buyers, make sure you test drive this 5.3 liter 6 speed Active Fuel Management AFM General Motors truck extensively at 45 MPH before purchase.
Ensure it doesn't clunk lag growl and sometimes bang .
If it does, don't let any GM employee insult you by saying it has to adjust to your driving habits!
#1353 of 1487 Re: New 2012 Sierra Silverado [ceb66]
Nov 03, 2012 (9:23 pm)
Really?! I'd call the dealerships GM and let him know what kind of people he's hiring...idiots.
#1354 of 1487 Re: New 2012 Sierra Silverado [Lady3bglover]
Nov 04, 2012 (1:29 am)
I think ceb66 was referring to chucky.
#1355 of 1487 Re: New 2012 Sierra Silverado [Lady3bglover]
Nov 04, 2012 (7:31 am)
There must be alot of "idiots" working as sales managers for GM! I'm exagerating. I really don't think so. They're just doing what the corporate people tell them to do. Contrary to the sales numbers, they're under a huge amount of pressure do to GM's financial situation.
However; many, many new 2010, 2011 and (apparently) 2012 GM Sierra and Silverado buyers have been told exactly that when they complain of the wierd/ackward transmission; "it has to adjust to your driving habits"!
Insulting to anyone with even a minimal mechanical background. I walked out when I was told that.
If they're using lines like that and there is an internal bulletin addressing the tranny/AFM issues, it's definitely widespread and they're keeping it under wraps. I know that from talking to techs and GM employees. My family worked in the industry.
After GM took the TARP money, they seem to have gone back to their old (1970s/1960s) approach to the customer; "just get the car sold, and use whatever line you have to to get them out of here if they have a problem."
#1356 of 1487 Re: GM Truck Clunk [ceb66]
Nov 04, 2012 (9:55 am)
Ceb, I tend to agree with you that most of the weird behavior in the drivetrain is software related, and it is probably related to the CAFE standards. My question to GM is if this is actually what is happening, how much improvement can it honestly make? Like 1 MPG? What tricks to you have up your sleeve for when you need to squeeze out another 5 MPG? I can't wait for this to happen. If I could easily reprogram my engine/tranny to behave like my 2005 Sierra Denali, I'd do it in a minute.
#1357 of 1487 You have to live with it
Nov 04, 2012 (8:59 pm)
No one ever denied that the 6 speed transmission and/or AFM sometimes does not make for a smooth power train.
However, with the number of SOLD units with the six speed transmission on the road-a software program reflash to fix or improve the power train is not going to happen IMHO, it's simply too costly.
And it doesn't matter how many negative posts people put on this board.
You can either live with it or buy a Toyota.
So far it HAS NOT AFFECTED RELIABILITY of the vehicle. They sell 40,000 units a month and I have yet to sell one sitting over on the shoulder of the highway.
Also, you can buy these trucks for $10,000.00 off sticker and save thousands over comparable trucks.
#1358 of 1487 Re: GM Truck Clunk [bigman55434]
Nov 04, 2012 (8:55 pm)
You could reprogram with an aftermarket tune. There are several on the market that have had good reports. However, if you have a 100K powertrain warranty IT MAY void it.
COST between $300-$500.00
#1359 of 1487 Re: New 2012 Sierra Silverado [obyone]
Nov 05, 2012 (12:30 am)
Yea-I will go pullout those TPMS sensors now.