GM has a design flaw on the trans cooler lines and steering lines that cause the to leak. GM will not address to date. This occurs on the 2500hd and 3500hd duramax pickups the lines have only three crimps and start to leak in cold weather.

- Rogers, AR, USA

The contact owns a 2007 Chevrolet Silverado. While driving approximately 70 mph, the contact stated that the transmission oil cooler failed, causing the vehicle to loose transmission fluid. The dealer informed the contact that the vehicle was not under warranty and that the transmission oil line cooler needed to be replaced. The manufacturer was contacted and the contact was awaiting a response. The vehicle was not repaired. The current and failure mileages were 67,674. The VIN was unavailable.

- Millersville, MD, USA

2007 Chevrolet Silverado pickup truck. Consumer would like GM to buy back truck because of design flaws and suspected lemon the consumer stated onstar activated and stated the vehicle had been in an accident. The consumer called onstar to tell them that the vehicle had not been in an accident. The operator asked the consumer were there any lights on the dash. The consumer stated the air bag light was on. The operator attempted to instruct the consumer on how to reset the light, and stated if it didn't clear within two days to call back. When the consumer put the gear into drive and started to go forward, there was a tremendous explosion, dust filled the truck and onstar came on saying the vehicle had been in an accident. They vehicle was towed to the dealership. A week later, the consumer received a call from the dealership stating the explosion was caused by a poor design in the galleys in the floor, they went from the center of the truck to the drivers side door under a rubber mate. One of the galleys went through a rubber grommet which allowed water to leak into a compartment storing very high pressure compact cylinders for the air bag and seat belts. The water caused corrosion on the high pressure cylinders and caused the explosion. Also, the tailgate latch would not latch properly. The dealer found the pivots had seized. On cold starts, the transmission would hesitate and then a loud bang was heard. The dealer found a valve body bolt broken.

- Mills, PA, USA

Transmission cooler line is leaking and needs to be replaced, when the weather turns cold the crimps fail and automatic trans fluid is lost causing the engine compartment to become a fire hazard when driving on the road. This is a very common problem due to the fact that the 4 other people I work with who have the same yr diesel truck or prior have had the exact same problem, not to mention countless other people online that I have talked to stating the same thing. Part number GM 20759971, GM 20759973, GM20759972. This is ridiculous that I as a consumer and everyone else have to pay for a defect that could possibly endanger my life or others in daily commuting. This is way to common to have us pay for the fact that they sent us out on the road with defective parts and are not willing to pay for there mistakes.

- Sparks , NV, USA

Automatic transmission lines 2007 Chevy Silverado with allison transmission. Factory transmission lines leak and must be replaced. When the weather turns cold, the lines/crimps holding the rubber hose to the pipes fail and automatic transmission fluid is lost, sometimes in catastrophic manner, causing the vehicle to loose propulsion. Reports of failure are extremely common, and it is not unusual, that the lines may have been replaced 3 times within the 1st 50,000 miles. GM has issued 'new, updated' parts, but they are no better than the original parts. The new part numbers are 20759971, 20759972, 20759973. While repair is covered on the 36K bumper to bumper warranty, there is no coverage on the 100K warranty. GM should replace the lines free of charge for the 1st 100K miles with a hose that will not fail. Consumers can take the original GM line to a hydraulic shop, have the rubber portion of the lines replaced with standard hydraulic hose suitable for atf fluid and there are no further failures. If consumers can fix the lines, perhaps GM can find a solution.

- Durham, NC, USA

Constant transmission cooling line leaks. 2007 Chevrolet Silverado hd 2500.

- Dallas, GA, USA

The contact owns a 2007 Chevrolet Silverado. The contact heard a noise coming from the automatic transmission and the vehicle was hesitant to shift into gear. The dealer repaired the vehicle under warranty. The failure recurred and the vehicle was taken back to the dealer. They stated that there was an issue with the vehicle and notified the manufacturer. The manufacturer advised the dealer not to make any further repairs until the transmission actually failed. The dealer obeyed the manufacturer. The VIN was unknown. The failure and current mileages were less than 20,000.

- Avon, IN, USA

Took my Silverado 2500 in for some maintenance and the dealer informed me the transmission cooler lines were leaking at the fittings from the cooler lines to the cooler. They also informed me this was a very common problem they have seen a lot of, but there is no recall and it would be a rather costly repair. I did not pay the outrageous fee and have not yet fixed the problem...

- Isanti, MN, USA

My transmission cooler lines began leaking 3 months ago. I took it to the dealer and instead of them replacing the lines, they told me that I needed a new transmission and lines and it would cost me $6200 to fix it.

- Eielson Afb, AK, USA

The contact owns a 2007 Chevrolet Silverado C1500. When attempting to accelerate the vehicle at 10 mph, the contact heard a loud clunking and revving noise as if it were downshifting or upshifting. The dealer speculated that the transmission was the cause of the failure. The technician referenced tsb number 10022769, but there was no current remedy. The contact is in the process of notifying the manufacturer. The failure mileage was 37,000 and current mileage was 41,000.

- Robertsdale, AL, USA

While doing routine maintenance on the truck I noticed the transmission cooler lines leaking. The failure is the cause of a poor fitting design on GM's behalf, and they have not committed to providing an updated part but instead choose to replace the lines with the same inadequate part. The leaking lines have not been replaced.

- Groveland, RI, USA

Leaking transmission cooler lines, failure at crimp between rubber line and metal line, started at 11,000 miles, replaced with new lines now leaking again at 20,000 miles.

- Page, AZ, USA

Hesitation on acceleration. While merging onto an interstate highway pressed the accelerator to rapidly increase speed but the vehicle hesitated causing me to have to continue down the shoulder and actually stop to avoid a stalled vehicle on the shoulder. I have taken my vehicle to two different dealers to investigate the hesitation on acceleration both have stated that this is normal operation for the 2007 Chevrolet Silverado. Although I didn't have an accident with this particular incident I have noticed this hesitation during normal day to day driving. This is a safety issue.

- Breese, IL, USA

Problems when I back up and forward, the brakes make noise I went to the dealer and they tell me, that is normal, but for a new vehicle it's not I don't like it they don't do anything, this bother me, plus this is the third time I took it in and I told them since the first time that it was vibrating, it seems that they are some transmission problems too.

- North Las Vegas, NV, USA

The contact owns a 2007 Chevrolet Silverado 2500. While driving between 40-60 mph, the vehicle vibrated from underneath. The vehicle was taken to the dealer on three occasions. The first time, the dealer did nothing to repair the vehicle. The second time, they replaced the drive shaft and rebuilt the rear end. The third time, they repaired the transmission. The current mileage was 1,200 and failure mileage was 400.

- Willis, TX, USA