GMC Canyon owners have reported 2 problems related to noises during shifting (under the power train category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of GMC Canyon based on all problems reported for the Canyon.
The transmission does not down shift when climbing a small hill in normal traffic at normal speeds. I constantly have to use the manual transmission to make the truck downshift or I have to press on the grass in order to bring the rpm up a little higher using more fuel than required. This in itself is dangerous since I am in then middle of traffic. When I purchased the truck none of the recall were on carafe nor did the dealer inform me that this vehicle type and model has already had several recalls affecting its performance and safety. There is also something wrong with the defrost system whether its on heat or cool. There is a rattling noise that can be heard over the fan noise when the vehicle air conditioner is switch to the defrost mode. I am truly disappointed and very concerned for my safety. Gm should have pulled this vehicle off the market!.
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At low speeds, doesn't matter if you are turning or going straight, the transmission will not shift properly when applying pressure to the gas pedal. It feels like you are driving a manual transmission in 4th gear when it should be in 2nd. When it does shift, it will drop two gears and you could be on top of the car in front of you. The Canyon's transmission is not predictable and could put you in a dangerous position in traffic. Have had the vehicle at the dealer where they applied an update per a gm bulletin, helped some but still have the problem. Transmission makes a terrible grinding/howling noise at low speed. Gm says this is a normal characteristic of this truck, I say it is dangerous. Gm needs to better address this problem than they have. This happens everyday the truck is driven.