2015 GMC Canyon: hesitation when accelerating

Filed Aug 17, 2017 · Transmission · 15,500 miles · AR

The transmission causes dangerous driving conditions. I have the same complaint as several others have reported.the transmission fails to downshift at lower speeds causing the hesitation when acceleration is needed. Pressing down further on the accelerator will lunge forward possible into crowed road way.

Filed Feb 28, 2017 · Transmission · 6,000 miles · MA

Truck transmission causes dangerous driving conditions I have same complaint as several others in the federal safety agency customer complaint section. Basically the transmission fails to downshift at lower speeds causing the vehicle to hesitate when acceleration is needed until it downshifts appropriately. Pressing down hard on the accelerator will result in a downshift, but this is a potentially dangerous maneuver in crowed road conditions.

Filed Aug 26, 2016 · Transmission · 2,000 miles · KY

I have same complaint as several others in the federal safety agency customer complaint section. Basically the transmission fails to downshift at lower speeds causing the vehicle to hesitate when acceleration is needed until it downshifts appropriately. Pressing down hard on the accelerator will result in a downshift, but this is a potentially dangerous maneuver in crowed road conditions. I have also gone to manual transmission mode but this is also potentially dangerous in crowded conditions and certainly inconvenient. Seems the volume of this complaint warrants a gmc response.

Filed Aug 12, 2016 · Engine · 29,000 miles · NC

On cold starts, the engine will stall at first stop. Typically this is at the first stop light or stop sign in the morning on the way to work. This is beginning to happen several times a week. It also has happened after sitting for several hours. It only appears to happen when starting the truck after the engine has cooled. Prior to stalling, the engine will hesitate and the rpms drop until ultimately stalling. I have called the gmc number and have asked the dealership to check it out. It cannot be duplicated by them and they say gm has not issued a recall or bulletin to repair.

Filed Aug 1, 2016 · Transmission · 1,700 miles · FL

Have 20000 miles on truck and transmission still does accelerate smoothly.there is hesitation while transmission find right gear.while towing travel trailer transmission will accelerate but not deaccelerate till I reduce speed manually.very dangerous.

Filed Jun 1, 2016 · Transmission · IL

Transmission does not shift properly will not down shift hesitating and feels like truck is misfiring ruff shifts clunking sound problems start at about 20 MPH when trying to speed up in traffic truck will not down shift or will downshift to violently causing truck to lundge forward and nearly rear-end car in front this is dangerous and could cause an accident gm seems to be ignoring this problem even though there seems to be quite a few people with the same complaint

Filed Mar 15, 2016 · Engine, Transmission · 500 miles · WI

The truck chugs and hesitates randomly when a down shift is required. Generally this random hesitation is just annoying. At times the vehicle will not downshift for a considerable time. When making maneuvers in and around traffic the trucks poor shifting causes the truck to jerk and not accelerate. When the truck will eventually does down shift the gas pedal must be all the way at the floor and accelerates at full speed. Bulletin pip5342a supposedly addresses the concern but says it is normal. Gm tells the dealer not to attempt to fix. I have had multiple times where this problem has put me at risk for an accident.

Filed Feb 17, 2016 · Transmission · 2,000 miles · PA

Vehicle upshifts too early at low speeds requiring additional accelerator input then downshifts 2 gears to compensate. This happens regularly when going around 15-20 miles an hour uphill or while making right turns while vehicle is in motion. When the vehicle is searching for the correct gear the accelerator pedal is numb for at least 2 seconds requiring at least 90 percent throttle then it finally picks a low gear and violently throws the driver and passengers back and roars to life. The 2 or more seconds of hesitation could be very dangerous in an emergency situation when quick acceleration is needed. My concerns were voiced to bowser buick gmc on 02/02/2015 during my first oil change. They informed me that gmc is working on programming for the sierra right now and when it's satisfactory, they will implement it on the canyons. No repair attempts were made to address this concern. They refused to make any repairs and said that I was added to a list of others with similar complaints.

Filed Jan 28, 2016 · Transmission · 5,526 miles · PA

Vehicle upshifts too early at low speeds requiring additional accelerator input then downshifts 2 gears to compensate. This happens regularly when going around 15-20 miles an hour uphill or while making right turns while vehicle is in motion. When the vehicle is searching for the correct gear the accelerator pedal is numb for at least 2 seconds requiring at least 90 percent throttle then it finally picks a low gear and violently throws the driver and passengers back and roars to life. The 2 or more seconds of hesitation could be very dangerous in an emergency situation when quick acceleration is needed. My concerns were voiced to bowser buick gmc on 11/20/2015 during my first oil change and they provided me with service bulletin #pip5342 which states "shudder or chuggle when accelerating at low speeds of 12-15 MPH in second gear is normal operation of the automatic transmission and the torque converter clutch. No repair attempts should be attempted to address this concern" they refused to make any repairs and said that I was added to a list of others with similar complaints.

Filed Dec 18, 2015 · Transmission · 12,000 miles · DE

Vehicle shifting lags and hesitates then engages abruptly causing unsafe acceleration. Specifically entering an on-ramp. When trying to merge into traffic from a slower ramp speed to join highway speeds the vehicle struggles to find the proper gear. In order to offset this problem the driver needs to depress the accelerator further to help the transmission downshift to a lower gear. However, doing so while the transmission is searching for the proper gear causes the vehicle to suddenly lurch forward with more force and acceleration then is required or safe. I have brought my truck into the dealership twice for this issue and was told that gm states that this is the normal operating conditions of the truck. I feel this is not an adequate response and certainly does nothing to address the safety issue of a transmission that disengages to search for a proper gear and then reengages abruptly causing the driver to make unnecessary and unsafe adjustments to keep the vehicle under control.