Dead peddle, very slow response time when trying to accelerate from a dead stop or trying to leave a parking spot. It can take up to 8 seconds for the truck to really get going. Very dangerous, almost got hit a few times with my family in the truck. Have to learn how to drive this truck, need to give twice the distance to cut across traffic. When you use the go peddle it should respond. Worse cummins I ever owned to use around town. Very dangerous its been this way since day one. Been to dealership many of times for samething. Test drove another truck has same issues. Read a lot of diesel forums and everyone has same issues. I've owed a 93, 1998, 2000,2002, 2003, 2005, 2008 and a 2015. 2015 is the worse throttle response and transmission programming out of all my diesels next time I see a dealership its going to be a Ford ot GMC.

- Butte, MT, USA

Engine: Heavy diesel smell when coming to a stop or at a stop when the def regeneration process in active. Power train: Loud clunk noise from driveline shifting from 3/4 or 4/5 and letting off the accelerator at the right time. Speed control: Dead accelerator pedal. This occurs if there is a slight acceleration followed by a release of the pedal and an immediate re-application of full throttle. The response is delayed by 3-4 seconds or not at all.

- San Diego, CA, USA

On 6.7L cummins diesel there can be an unpredictably long ( up to 2 second) delay between when the accelerator is pressed and when the truck actually begins to accelerate. This is not turbo lag (which may limit the amount of power until the turbo spools up). This is not a stumble. This is an actual delay in the computer applying fuel to the engine. It is total dead time as if the accelerator was not pressed at all. It happens under the worst of conditions, when you need hard acceleration and need it now. It happens when you attempt to accelerate quickly, especially when you were coasting or had just let off of the pedal. These are conditions that often occur in traffic with many other vehicles nearby. The long delay between throttle application and engine response is extremely dangerous. My truck has the latest "flash" from the dealer, it is running the most up-to-date firmware available from the dealer.

- Oakton, VA, USA

Dead pedal when pressing on pedal truck does not move. Happened about 6 times on my. When taken off from a light and also when slow rolling the press pedal with no responce. Almost be hit twice by other cars when trying to pull out and truck does not move.

- Concord, CA, USA

"dead pedal" on cummins diesel engine. If accelerating then let off the accelerator pedal, then press it again, there will be a momentary "dead pedal" for several seconds or more where no engine power is applied. The harder you press the pedal the second time (I.e., the more you need the power), the worse it is. I have experienced this when trying to merge in heavy traffic, when crossing intersections, and other times where I needed the engine to give me power right then, not several seconds (or more) later. This could very easily lead to an accident.

- Oakton, VA, USA

While driving approximately 35 miles an hour, my right knee swiped my key fob/key chain and turn the ignition from on, to the acc position thereby turning the engine off. I loss all power and was unaware for a few seconds until the truck from loss of power was slowing down and hard to steer. Was able to get to side of road and restart engine and proceed on without further incident. Upon further examination, it looks like my knees from normal driving will make periodic contact with the key fob and key chain and see this as a potential safety issue since power is lost and air bags may not deploy in an accident.

- Bear, DE, USA