Collapsed lifters diagnosed in 5.3L engine, monumental repair cost. Vehicle has had oil changed religiously every 3000 miles. Worked one day next valve train tried to jump out of the hood.

- Smithfield, VA, USA

While merging onto the express way I had a major loss of power and a slight shake in my Silverado. Multiple engine lights came on (stability track, traction control, and blinking engine light). On my way to the nearest GM dealer, at every stop light the truck lacked power to get going when the peddle was pushed, then it would kick in and screech the tires. After leaving the truck at the dealer, I receive phone call from the dealer the following day stating that the lifter (afm lifter) had malfunctioned and was stuck. I asked what causes this (because my truck only has about 39,700 miles on it), and the dealer stated it was "an issue with the design of the engine." I then researched the internet (GM forums, social media, NHTSA) to find out that this is a huge issue. Many owners had the bad lifter replaced under warranty, only to have a different lifter go bad. I decided to have the dealer replace all my lifters, because that is what they recommended and they admitted there is a good chance I would be back in for the same issue on the other lifters if I didn't replace them. The dealer contacted GM to see if any of my repair could be covered under the powertrain warranty because I only have 39,700 miles on it, but my truck was 8 years old so they said they wouldn't. I contact GM to see if I could directly get anything covered seeing I only had 39,700 miles, plus bought an extended warranty that just expired last year. I was transferred through 5 different representatives that all admitted that the lifter failure is "an issue, but not a recall." If they know its an issue, the dealers know its an issue, its a extremely common issue all across the internet, why wont GM take care of it? my Silverado cost over $45,000 when new, you think it should last well over 100,000 miles with no engine problems.

- Merrillville, IN, USA

Last fall 10/14 replaced all brake lines due to corrosion (97000 miles). Which has been mentioned numerous times already. After that ABS light came on intermittently lost brakes last week to it to the shop they had it for the day everything worked fine. Continued driving light started coming back on & brakes were erratic. Yesterday was pulling out of parking lot had no brakes. If these are known problems why isn't anyone taking care of it. Why you would put untreated brake lines on a vehicle in the salt districts is beyond me. I had an 1989 Oldsmobile with the original line on it til 198,000 miles. I also replaced the transmission at 77,000 miles due to corrosion of the lines.($2700)

- Geneseo, NY, USA

Sag or hesitation on acceleration (normal operating characteristics). Equipped w/ gasoline and automatic transmission.

- Dallas, TX, USA

The contact owns a 2007 Chevrolet Silverado 3500. The contact stated that transmission fluid was leaking from the vehicle. The contact replaced both transmission lines at there expense. The manufacturer was contacted and stated that that they were unwilling to repair the failure. The approximate failure mileage was 41,000.

- Dunn, NC, USA

GM has a design and/or manufacturing flaw in the transmission lines on the 2500hd. I have had mine replaced under warranty once, and need to have them replaced again. They only leak in cold weather when the rubber in the line shrinks at the crimp causing them to leak. The danger here is the fire potential. Due to the diesel regeneration process that burns off the diesel particulate filter and the heats it to extreme temperatures this has a potential fire risk. GM refuses to address the leaky transmission lines. There are multiple accounts of this issue, on several year models of durmax pickups, on the internet. Additional concerns here are how acidic transmission oil is. It also has potential to deteriorate rubber steering components boots ball joint covers, etc. This is safety concern.

- Hayes, VA, USA

Upon driving the engine began making extreme noise and major loss of power. Multiple engine lights came on and backfire through exhaust. Contacted Chevy dealer and dropped off for diagnosis. Problem was active fuel management lifter failure. (please take note that this issue is all over the internet and social media) this problem is happening to a high volume of Silverado truck manufactured after 2007 with afm. Chevrolet has bulletins on the issue but will not recall to replace all afm lifters. They only replace the lifters that fail. This causes issues later when additional lifters fail. If all aafm lifters (8) would be replaced at the same time consumers wouldn't be complaining via social media and internet. Chevrolet acknowledges the problem but refuses to recall. Reason for refusal is it seems to happen around 50,000 miles and above and after the repair they hope that the issue happens after the 100,000 mile warranty when repairs are paid for by consumers costing thousands of dollars. I personally have read of this happening and had it happen just recently. GM refuses to back their product although they recognize the problem. Bulletins have been issued but I was told that the NHTSA makes the call after enough complaints are filed by consumers. People just don't know this and I am requesting you urgently look into this issue. Catastrophic engine failure can result costing consumers a lot of money. We are just the little guy up against a large automobile manufacturer. We need your assistance in forcing GM to issue a recall on these vehicles with the active fuel management. Our hands are tied because of this. We request that if there is a afm lifter failure that all lifters be replaced instead of the ones that failed. This is only logical especially when GM knows there is a problem. Please help us the consumer.

- Sarver, PA, USA

The contact owns a 2007 Chevrolet Silverado 1500. The contact stated that the vehicle was exhibiting a loud, unusual noise while driving at various speeds. The contact inspected the vehicle and discovered that the transaxle was leaking oil. The manufacturer advised that the warranty coverage for the transaxle assembly replacement expired and denied any assistance with the repair. The vehicle was not taken to the dealer to have a diagnostic performed. The vehicle was not repaired. The failure and current mileage was 88,943.

- Rolland , OK, USA

Vehicle is parked in garage overnight, get in to start, shift lever in park, turn on key, vehicle's transmission sends out a "clunk", as if to engage and go forward or backward. This type of action started around 8000 miles as a slight, "clunk" extending into 49000 miles with a hard jarring"clunk". of course I took it to dealer in the course of the warranty, had them note and record defect, however dealer could not get vehicle to perform this operation while in their possession which extended over night and sometimes 2 nights. While the vehicle does not do this on a regular basis, it is notably getting a harder sounding, more pronounced "clunk". the shifting noise of the transmission is becoming evident, that is in low speed there is more rough clunking as the transmission goes through it's gears.

- Sublimity, OR, USA

Excessive oil consumption - truck runs out of oil every 2500 miles. Change it regularly. No leaks or blue smoke.

- San Antonio, TX, USA

I have marked power train and electrical since both are involved. I was driving home from work when my truck message center indicated (reduced engine power). This is dangerous when my vehicle is impeded from accelerating and slowing down to no more then 20 - 25 miles per hour. Since I could of interfered with the traffic and cause an accident or bodily injury to others. A recall should be made since I have noticed a lot of other vehicles have the same scenario.

- Hayward, CA, USA

Hydroboost lines leaking/seeping lower transmission line leaking

- Delta, CO, USA

The contact owns a 2007 Chevrolet Silverado lt. The contact stated the throttle would stick anytime he attempted to release the pedal. The vehicle slows down very slowly. The engine continues to run at 800-100 RPM's until the brake is applied to stop the vehicle. The consumer also stated while stopped at a traffic light or a stop sign, the engine would occasionally speed up to approximately 1800 RPM's. the consumer also stated a new engine was installed on April 11, 2001 due to a faulty oil pump. The throttle body and engine control module were replaced twice, the hbac control module, oil deflector, purge valve and canister, maf sensor, wiring harness, speed sensor, CO2 sensor, 175 amp fuse box, transmission control module and under hood wiring were all replaced. An engineer from General Motors has worked on this vehicle at all three dealerships and has not been able to repair the problem. The manufacturer was contacted and they offered little assistance. The failure mileage was 46,000. Updated 06/22/11 updated 07/08/11 updated 3/8/12

- Grantville, KS, USA

I am getting a noticeable vibration in the drive train at about 45 mph. It finally subsides at around 55 mph. I have had the oil level checked in the transmission and the rear end oil checked. All is ok in those areas. Contacted a local Chevrolet dealer and explained the situation on the phone and I was told that is was normal for that make, model and drive train. Also had the underside of the vehicle checked to see if there was anything loose that might cause the problem especially the exhaust system and all is ok. Never had this problem before. Just started. Chevrolet won't bother with it.

- Whitsett, NC, USA

On 10/18/2010 returning home from vacation, my right front wheel assembly suffered severe internal failure. The dealer in South Carolina repaired my vehicle, and covered the expense of the replacement part and labor under the powertrain warranty. They also had to replace the front brake pads and resurfaced the rotors which were damaged to the severe internal failure of the wheel hub assembly. I can understand the malfunction of the part, it happens. But, on 12/17/2010 the left front wheel assembly suffered internal failure, again the dealer covered the expense of the replacement part and labor under the powertrain warranty. I believe their must be a problem for both front wheel hub assemblies to fail, I only have under 30,000 miles on the vehicle. Thank you.

- Lockport, NY, USA

Thump after coming to a stop. After about 24,000 miles. I started feeling a light thump from the rear, as if someone bumped me from behind. Over the next few weeks it became very noticeable, so I took it to the dealer for investigation. The 1st time, they said the rear-end had the wrong lube in it & they replaced it. This seem to work for the next several weeks. Then the thump returned lightly at 1st & gradually worsened to a major thump. I returned it to the dealer & this second repair was that the lubed the rear-end & replaced the yoke on the driveshaft. This repair worked for about a week & I started feeling the light thump again. I took it back in again, left it all day & they apparently drove it around the parking lot & couldn't duplicate the problem. One of the service managers rode with me, around the parking lot & the problem wouldn't show up. It has since worsened again & I will take it back in once the problem gets a little worse.

- Memphis, TN, USA

The contact owns a 2007 Chevrolet Silverado. While driving 30-35 mph, the speed does not increase on the vehicle, even when the accelerator pedal is depressed to the floor. This is a safety hazard when driving on the freeway. The vehicle was taken to the dealer, but nothing was repaired. The manufacturer acknowledged the failure, but stated that the vehicle was supposed to perform in that manner. The current mileage was 2,800 and failure mileage was 73.

- Ellyville, OK, USA