2019 Ford Mustang: sudden loss of power

Filed Oct 21, 2026 · Engine · NJ

My 2019 ford mustang egoboost with only 59,000 miles has a cylinder three coolant intrusion. This is disappointing, as the only right way to fix this according to Ford, is to replace the whole engine. Nobody should expect to have to fix their entire engine. Now on cold starts coolant is leaking in to cylinder three, which is causing misfires and could potentially lead to a safety, risk. Ironically, there’s a lawsuit currently in place for this exact problem. This is a problem, sudden engine failure or stalling due to severe coolant intrusion introduces a dangerous loss of power while operating the vehicle at speed and could lead to a blown or locked up motor. Ford has kept this under wraps since the release of this generation of vehicle.

Filed Aug 18, 2026 · Engine, Transmission · TX

My 2019 Ford Mustang equipped with the 2.3L EcoBoost engine developed a check-engine light, rough startups, engine misfires/rough running, and some engine knocking. The vehicle had approximately 87,453 miles. I took the vehicle to an authorized Ford dealership for diagnosis. The dealer brought the engine to operating temperature, pressurized the cooling system to 21 PSI, removed the ignition coils and spark plugs, and inspected the cylinders with a borescope. The dealer documented coolant intrusion into cylinder #2 due to a failed cylinder head and recommended replacement of the complete long-block engine due to the extent of the damage. The dealer also documented diagnostic trouble codes P0300 and P0316 for misfires, along with P008A and P018C related to low-side fuel pressure. I am concerned that internal coolant intrusion causing misfires, rough operation and engine knocking could result in significant loss of engine power or engine failure while driving, creating a safety hazard, particularly at highway speeds or in traffic. Ford Customer Relations was notified but declined financial assistance because the vehicle is outside the factory warranty and stated that there is no applicable recall for my vehicle. The vehicle has not been repaired and is available for inspection. The Ford dealership's written diagnostic report and photographs of the cylinder inspection are available.

Filed Aug 11, 2026 · Engine · GA

2019 Ford Mustang with 3.2 EcoBoost engine has coolant intrusion into the engine thru a defectively made engine block. Diagnosed by the Ford dealer in Hinesville,GA on August 11,2026. Car has 52,731 miles on it and has always been maintained by the local Ford service department. Car is a daily driver, no abuse or rough driving. Car is available for inspection upon request Coolant intrusion can cause sudden engine failure, loss of power and sudden stoppage at any speed. Overheating due to loss of coolant, engine fire, loss of control of the car. Check engine light came on and engine ran rough on cold start up on [XXX] & i then took it in to be checked out by Ford service. Service advisor stated that this coolant intrusion is due to a Ford known defect in the EcoBoost engines; but that there has been no recall. Only solution he offered was to have a new replacement engine installed for about $13,500. I declined the replacement. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Apr 7, 2026 · Engine · WA

Description of the Defect: My 2019 Ford Mustang EcoBoost experienced a premature engine failure caused by internal coolant intrusion, resulting in the need for complete engine replacement. This failure is not related to routine maintenance or a head gasket issue, but rather a known internal engine design defect that allows coolant to intrude into the cylinders over time. The vehicle exhibited symptoms including coolant loss without visible external leaks, rough operation, and engine malfunction. Upon inspection by a Ford dealership, the failure was diagnosed as coolant intrusion into the engine, with the only repair option being long‑block (engine) replacement. Ford has acknowledged this failure mode in Technical Service Bulletin (TSB) 19‑2346, which documents coolant intrusion in EcoBoost engines and states that engine replacement—not head gasket repair—is the required corrective action. This bulletin confirms the issue is caused by an internal design flaw that develops over time. Why This Is a Safety Concern: This defect can lead to sudden engine misfires, loss of power, or complete engine failure while driving, which poses a serious safety risk to vehicle occupants and other road users. Engine failure at highway speeds or during normal driving conditions creates the potential for crashes, loss of vehicle control, or roadside breakdowns in unsafe conditions. The failure occurred at very low mileage (~36,000 miles), indicating a premature and abnormal engine defect, not normal wear and tear. Yes, it is available for inspection upon request. Yes, it is diagnostic and confirmed by AutoNation Ford Bellevue [XXX] Direct line: [XXX] No, prior warning and symptoms. First appeared on March 16, 2026. No recall exists despite Ford’s TSBs acknowledging the defect. Ford later redesigned the EcoBoost engine, showing awareness of the issue, yet owners are forced to pay for costly engine replacements after warranty expiration. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Oct 14, 2025 · Body, Electrical · FL

I am filing this complaint regarding a vehicle I purchased from Florida Fine Cars in Miami Gardens on [XXX}. The vehicle is a Ford Mustang GT with a Roush supercharger (VIN: [XXX] ). Immediately after purchase, the car exhibited serious performance and safety issues that were never disclosed by the dealer. Within hours of driving home, the vehicle showed severe power loss, hesitation during acceleration, and loud mechanical noises at highway speeds. These issues were not detectable during the brief, low-speed test drive the dealership provided. Additionally, by the next morning, the car emitted a strong plastic or chemical odor under the hood, which intensified in the Florida heat — suggesting a possible engine, exhaust, or emissions-related fault. The dealer misrepresented the condition of the vehicle, repeatedly claiming it was “fully inspected” and “in excellent condition.” However, a certified Ford dealership technician later confirmed that the car “ran like garbage” and required immediate diagnostic attention. These defects are potentially safety-related, as they directly affect the engine’s performance, drivability, and emissions integrity. The vehicle could stall, lose power during acceleration, or emit toxic fumes. Florida Fine Cars has refused to take responsibility, despite clear evidence that the car was sold with undisclosed defects. Their actions constitute false advertising, misrepresentation, and a disregard for consumer safety. I urge the federal safety agency to record this complaint and investigate whether similar vehicles sold by Florida Fine Cars (or others with aftermarket superchargers) have unreported safety or emissions defects. This poses a serious risk to consumer safety and compliance with federal motor vehicle safety standards. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Jun 16, 2025 · Engine · TN

5.0 GT Engine continues to lose power and has loud “clicking” when idling. First appeared after May 2025 oil change. Mustang dealer ran codes check - nothing shows up. Mustang dealer has recorded a video / audio of sound and recommends engine replacement. The engine only has 22,000 miles on it .

Filed Apr 9, 2025 · Engine, Transmission · CA

The contact owns a 2019 Ford Mustang. The contact stated that while shifting from reverse(R) to drive(D) or from park(P) to drive(D), the vehicle jerked before shifting into the intended drive mode. While driving at approximately 50 MPH, the vehicle was shaking abnormally while accelerating. The check engine warning light had illuminated intermittently. The wrench symbol was displayed on the instrument panel, and the vehicle lost power. They waited for a while before restarting the vehicle. The failure was intermittent. The vehicle was taken to the dealer, who diagnosed that there was a failure with the transmission, but had not determined which part in the transmission had failed. The vehicle was not repaired. The manufacturer was informed of the failure and opened a case. The manufacturer referred the contact to the federal safety agency Hotline to report the failure. The failure mileage was unknown.

Filed Apr 29, 2023 · Engine · NV

I was driving on the the 215 Freeway in Las Vegas and the car started to shutter with a loss of power in the engine. The check engine light starting blinking orange. I was going downhill so I let the car coast while I tried to pull off the road. After about 15 seconds the engine stabilized and the check engine light stopped blinking and stayed a solid yellow. I pulled the car off the road and let it rest. I was able to get the car home and took it to V & V Auto in Las Vegas the first appointment I could make. I was told coolant was leaking into the engine and the head gasket needed to be replaced. The mechanic told me this is a design flaw with the Ford EcoBoost Turbo Engines. Why is Ford allowed to put faulty engines on the road? I only had 64000 miles on the car at the the time and I have always had the car serviced.