2021 Ford Ranger: sudden loss of power

Filed May 27, 2026 · Transmission · VA

The 10R80 transmission CDF drum failed due to a defective bushing housing, resulting in the replacement of the 10R80 transmission. The diagnosis of the failure took 3 weeks because there were no warning lights or engine codes. The symptoms of the failure were erratic shifting in heavy highway traffic, causing harsh up/down shifts and shift patterns. The erratic shifting makes driving feel unsafe, as the vehicle may lurk or seem to lose power. Currently, with the new 10R80 transmission with the redesigned CDF drum bushing housing, similar symptoms of erratic up/down shift going between 20-40 mph and between gears 3-7 are present. The vehicle is going back in to the shop for diagnosis and potential repairs

Filed May 4, 2026 · Transmission · VA

What component or system failed or malfunctioned, and is it available for inspection upon request? Automatic transmission failed How was your safety or the safety of others put at risk? While merging into traffic the transmission would not shift and the truck lost power and began to slow down. Has the problem been reproduced or confirmed by a dealer or independent service center? Yes the dealership experienced the same problem. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? The Ford dealership is replacing the transmission at my cost. Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? There were no warning lamps or messages. The transmission was working fine and then it wasn't.

Filed Apr 1, 2026 · Transmission · CA

Truck Issue Description (2021 Ford Ranger – ~93k miles): Truck makes a whining / humming noise with a slight rattling vibration. The noise occurs while accelerating in gears 1–5. The pitch stays mostly the same but gets louder under throttle. The noise goes away when I let off the gas. No noise when revving the engine in park/neutral. No loss of power and the transmission shifts normally. Gears 6–10 sound normal with no noise. At idle there is sometimes a light rattling sound. Transmission fluid was changed around 60,000 miles. Check Manual light came on yes it has been confirmed by a service center transmission is giving out. Mileage: ~93,000 miles.

Filed Feb 21, 2026 · Engine, Fuel system · GA

My truck loses power at a stop, starting to accelerate is stalls in the middle of the road. It seems to be stuck in gear or not going in gear. It will finally start going and the hesitation starts a the rpm gage goes up to about 3000 rpm’s and then goes back down to 1500. This is extremely dangerous to lose power in the middle of the road. This needs to be addressed.

Filed Mar 17, 2025 · Engine, Fuel system · NY

It started moth my vehicle losing power and chugging , dealership diagnosed as transmission (10 speed ). After all of the Ford appointed tasks to fix said problem, valves were replaced , did not work then entire transmission was replaced . After 7 times in the shop and many missed work hours . Maybe 2 weeks later truck starts bucking as I enter the highway , was close to getting rear ended . Brought vehicle to dealership 2 weeks later diagnosed with the turbo going out in it . And then Friday 3/14 driving home from work the check engine light comes on. Says emission issues ? Also says need to service engine soon . Dealership says it is fine to drive they will call me when they can figure it out ? My vehicle ha less than 25k miles these issues started when I had 17k on it Started 8/5/24

Filed Dec 2, 2024 · Transmission · 37,000 miles · FL

The contact owns a 2021 Ford Ranger. The contact stated that while driving at various speeds, the vehicle hesitated and jerked while depressing the accelerator pedal. The contact stated that at first there were no warning lights illuminated; however, after a while the "Power Train Malfunction - Reduced Power" message was displayed. The dealer and an independent mechanic were notified of the failure and acknowledge that the defect was a common failure. The contact was provided an estimate for a new transmission. The manufacturer was also notified of the failure and the contact was offered financial assistance if the vehicle was serviced by a Ford dealer. The vehicle was not repaired. The failure mileage was approximately 37,000.

Filed Jul 31, 2024 · Engine, Fuel system · AR

Water leaks into spark plug wells causing vehicle to lose power no cover is over the sparkplugs

Filed Jun 25, 2024 · Transmission · OR

Truck has hard shifting and loss of power, usually on startup and at low speeds (like in a parking lot) that cause lurching and no response from gas pedal. These events are not reliably repeatable, and result in no dash lights. Sequence of events, start truck, place in reverse, back out of parking spot, place in drive, apply throttle/gas pedal, while driving slowly, car will hard shift, sometimes resulting in a lurch forward, approach exit to parking lot, truck rolls down slight incline of parking lot entrance and throttle is unresponsive to gas pedal, no power, release pedal, wait a second or two, apply pressure and it works. Driving at low speeds in parking lots, truck cannot decide what gear to be in, and sounds horrible, 5-10 mph. Approaching stops on an incline, driving forward, release gas, start to apply brakes, truck will shift and apply power while under braking. Once, pulled in to parking space, backed out to straighten, placed in drive, wrench light came on, no power. Turned the truck on and off again, and that fixed the issue. All incidents between 20k and 40k miles.

Filed Apr 17, 2024 · Transmission · PA

Harsh shifting into D, loss of power when accelerating while cold. Sometimes would start across an intersection then buck, loose power and slow down then SLAM back into gear and chirp the rear tires. Technical Service Bulletin 23-2350 was performed on 11/15/2023 which updated the trans tables and cleared some codes. This helped the issue for about a week but then truck was in again on 1/22/2024 for TSB 23-2350 a second time which replaced the CDF drum. A month later, 800 miles, 2/18/2024 truck shifted HARD while in cruise control on the turnpike in traffic and lost power. DTC P0766 check engine light came on and truck would no longer move. Transmission fluid sprayed under truck. Had to be towed to dealership. Clutch Valve D was replaced. Two months have gone by and the hard shifting into D and occasional complete loss of power still occurring. Waiting for the next check engine light to appear to take it in again. I now drive very conservatively because I don't know if it will stop moving half way across an intersection again.