2020 Ford Mustang Complaints

ENGINE — Filed 07/08/2026

I own a 2020 Ford Mustang EcoBoost with approximately 75,000 miles. My vehicle developed a check engine light with diagnostic codes P0300 (random misfire) and P0301 (cylinder 1 misfire). I also began experiencing white smoke from the exhaust during cold starts. An independent repair shop suspects coolant is entering cylinder 1 due to a possible head gasket failure. They have recommended removing the cylinder head to inspect for cracks, check for warping, pressure test the head, inspect the cylinder walls, and replace the head gasket and related components if no further engine damage is found. The vehicle was properly maintained, and these symptoms appeared unexpectedly.

SERVICE BRAKES, HYDRAULIC,ELECTRICAL SYSTEM — Filed 07/07/2026

The contact owns a 2020 Ford Mustang. The contact stated while the vehicle was parked, the contact noticed smoke coming from underneath the hood. The vehicle was unoccupied. The contact inspected the vehicle. The contact stated that the fire was about three inches from the back of the engine, close to the fire wall. The contact used a nearby fire extinguisher and extinguished the fire. The contact stated that upon further inspection of the vehicle, the contact noticed brake fluid on the ground underneath the vehicle. The vehicle was towed to the dealer, however the diagnostic test had not been completed. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The contact stated that the failure was a known failure with the vehicle. The manufacturer was not made aware of the failure. The failure mileage was approximately 41,331.

POWER TRAIN — Filed 05/17/2026

My car has always been a little rough on shifting since around 40k miles when I got it. I never really noticed after awhile and never had any problems. No lights flashing or codes no issues with anything under the hood. The other day my trans light popped on, but nothing was wrong the car was still driving fine. I took it in to get looked at the first shop said no codes were popping up and then I took it to another and they said the whole transmission now needs to be replaced. I went to look around and apparently a lot of people have issues with the transmission on the 2020.

ELECTRICAL SYSTEM,ENGINE,FUEL/PROPULSION SYSTEM — Filed 05/04/2026

Check engine light came on, car lost power on highway. Car continues to have the same issue after repairs have been made. Ford App says engine misfire, after every repair. Ford mechanics fix spark plugs, coils, electrical. None of which has fixed the issue of stalling on the highway which poses risk of me the driver and others driving on the highway. The only light that comes on is engine light.

AIR BAGS — Filed 04/27/2026

My husband was notified via the Ford app that there was an issue with his airbag system. He called the dealership and set up an appointment. We brought in the car to German Ford dealership in Beavercreek on 4 May, where they confirmed that the airbag was bad and needed to be replaced. They confirmed it was the airbag on the drivers side knee. The airbag light did come on, but we were under the impression airbags usually last the lifetime of the vehicle. Thankfully the car warranty covered the replacement, and we just had to pay the deductible. However, had my husband been in a crash that airbag would not have deployed, there is also the chance that the airbag could have deployed randomly while he was driving, which would have caused a potentially fatal crash.

POWER TRAIN — Filed 04/08/2026

My vehicle would suddenly downshifted to first, constantly seek for gears, loss of traction from not finding gears, and transmission died at 120k miles.

POWER TRAIN,UNKNOWN OR OTHER,ENGINE — Filed 11/28/2025

IMRC actuator rod broke causing the air/fuel mix to be sporadic. Creating a misfire on random cylinders. Major loss of power and very jerky motions, causing the vehicle to loose control. Luckily it was on an open spacious road. Unfortunately this has been an ongoing problem and there is nobody selling updated parts the electronics will recognize and very difficult to find oe replacement parts, real costly. And may fix the issue for a short period of time. I have a brand new manifold off of a same totaled mustang since Dec 2025 and the same part broke.

POWER TRAIN,ELECTRICAL SYSTEM,FUEL/PROPULSION SYSTEM — Filed 03/29/2026

My 2020 Ford Mustang Ecoboost has a (P008A) AND (PO18B/PO18C) The fuel pressure fuel system you low and fuel pressure Sensor B is a well documented defects and has a customer satisfaction program 21N10 (or related TSBs). The dealer said there are no recalls under my vin number and vehicle was not repaired. I sent a certified letter to ford March 29, 2026 to Ford Motor Company and I have had no response. 2015 thru 2022 Mustangs have this well known defect. I am not sure why the 2020 mustang has not been issued a recall. It's the same identical part as the other years Mustangs that have been recalled

UNKNOWN OR OTHER,FORWARD COLLISION AVOIDANCE — Filed 02/27/2026

I had parked my car in a spot at an office building. As I was about to put the vehicle in park it lurched forward going over a standard curb across a sidewalk and then into the brick wall of the building. The air bag did not deploy. The car lurched about ten feet total before hitting the wall.

ENGINE — Filed 01/16/2026

FAILURE TO NOTIFY/ADDRESS A KNOWN ISSUE DURING THE WARRANTY PERIOD Vehicle has been serviced in accordance with Ford’s recommended maintenance schedule by Joe Cooper Ford of Edmond, Oklahoma, since purchase. At service appointment in September 2025, with 59,968 miles – just prior to the 60k mile powertrain warranty expiration – specifically requested a thorough inspection of any conditions that could potentially be addressed under warranty coverage. During that visit, Joe Cooper Ford documented that the “coolant was low (at minimum mark) and dirty” and recommended a coolant system fluid exchange. This finding occurred in the context of the well-documented coolant intrusion defect affecting 2017–2020 Ford Mustangs and other Ford models. When an authorized dealer observes conditions consistent with a known defect during the warranty period, reasonable warranty administration requires disclosure and further diagnostic evaluation, so the customer has a meaningful opportunity to pursue timely repair. By January 2026, at only 61,640 miles, were informed our engine had failed. No such disclosure or evaluation was provided. As a result, we were deprived of a reasonable opportunity to address the condition under warranty prior to expiration. The subsequent engine failure occurred after the warranty period but was directly preceded by these unresolved indicators. Under these circumstances, denial of warranty consideration is inconsistent with the purpose of the warranty and reasonable consumer expectations.