general problems of the 2014 GMC Yukon

While driving the vehicle it randomly looses engine function decreasing speed rapidly. The check engine light comes on and it says engine power reduced along with traction-off and stabilitrak- off. There was a safety recall 14v-614 that pertains to the chassis electronic module. I have had multiple shops look at the problem the last being a GMC dealer who replaced the accelerator pedal for the 2nd time but did not fix the issue. This issue began in early 2024 and vehicle has sat in driveway not being driven every since.

While driving, the vehicle display screen and lights start turning off and on. The warning lamp says " service trailer brake system" and the vehicle is unable to accelerate at all. Leaving me at a stand still in the middle of the road. It's a safely hazard because it happens suddenly and without warning and I am unable to move my vehicle so I'm just in the middle of the road. I haven't taken it in to the dealership yet. I looked online and there is a recall called " chassis electronic control module internal contamination" that meets the description of what's going on here, but when I called GMC they said there is no recall for my specific VIN, even though the recall is for my make model and year.

Driving normal, 65 mph 5/28/21 warnings -- check engine light comes on; stabilizer disabled; traction control disabled; error code 2138 reduced power mode. Replaced accelerator pedal with oem part # 23362231 after 4 stop/start cycles, the check engine light goes off, vehicle drives normally. 6/2/2022 normal city driving; warnings -- check engine light comes on; stabilizer disabled; traction control disabled; error code 2138; reduced power mode. After 4 stop/start cycles, the check engine light goes off, vehicle drives normally. 7/14/2022 normal city driving; warnings -- check engine light comes on; stabilizer disabled; traction control disabled; error code 2138; reduced power mode. After 4 stop/start cycles, the check engine light goes off, vehicle drives normally. 8/4/2022 -- warnings -- check engine light comes on; stabilizer disabled; traction control disabled; error code 2138 reduced power mode. Dealer attempted repairs; had vehicle one week. 8/10/2022 normal city driving; warnings -- check engine light comes on; stabilizer disabled; traction control disabled; error code 2138; reduced power mode. After 4 stop/start cycles, the check engine light goes off, vehicle drives normally. 8/12/2022 normal city driving; warnings -- check engine light comes on; stabilizer disabled; traction control disabled; error code 2138; reduced power mode. After 4 stop/start cycles, the check engine light goes off, vehicle drives normally. 8/16/2022 normal city driving; warnings -- check engine light comes on; stabilizer disabled; traction control disabled; error code 2138, reduced power mode. After 4 stop/start cycles, the check engine light goes off, vehicle drives normally. 8/22/2022 -- left at dealership; they had it for two weeks, unable to find a specific cause. Tech confirmed and found fretting on connector for throttle body and for connector going to accelerator pedal pigtail harness. Replaced throttle body and pigtail harness.

While driving at approximately 65 mph on a highway, the locks engaged, the radio shut down, power steering was lost, and the vehicle slowed down/braked on it's own. Thankfully we were able to move to the side of the road without getting hit. The only message on the dash was "service stabilitrack. " the dealer and an independent mechanic have been unable to replicate the error message.