2019 Ford Mustang Engine Problems

The contact owns a 2019 Ford Mustang. The contact stated that it was difficult to start the vehicle. While driving at 30 MPH, there was a significant amount of white smoke coming out of the exhaust pipes, reducing the visibility of the rear of the vehicle. The contact was able to pull over to the side of the road. The vehicle was towed to the dealer, where it was diagnosed, and it was determined that the engine was blown. The dealer determined that the engine needed to be replaced. The manufacturer was notified of the failure, but no assistance was provided. The failure mileage was approximately 44,000.

The car is using a lot of engine coolant and oil. It is also burning the spark plugs. The check engine light comes out 6k miles after I install new spark plugs and it starts shaking, misfiring, running poorly, not accelerating properly and blowing white smoke through the exhaust on cold start. I know the engines have a defect from factory that causes them to do this. It usually needs a new head gasket, block or engine. Please advise. I read a forum that referred me to this website. The car is well taken care of and has 115k miles.

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)

Have a 2019 Ford Mustang 2DR 2.3L Ecoboost with 59,500 miles which I took to the dealership with a code P0302 and P0304 present, cylinder misfire, observed coolant level low, performed borescope in cylinder 2 and 4, found coolant intrusion, recommend long block engine replacement which would have cost me $10,728.85. Concern is that the engine can stall suddenly and may cause an accident. Ford Motor Company knows about these kind of engine issues with Ecoboost engines and have not offer any reasonable solutions. Vehicle VIN is the following: [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Ford's 2.3L EcoBoost engine defect that causes coolant to leak into the cylinders, leading to engine failures and potential fire risks.

Purchased just 2 months ago from ford dealer, after 1 week noticed shimming of engine on cold start, next incident overheat warning, filled with radiator fluid, noticed slow lowering of fluid level, next day car would not start at all. Towed to mechanic in which they report blown head gasket and all 4 cylinders damaged. After searching this site I found others had same complaint but no recalls. Evidently there is a lawsuit, how do I participate so I can get my beautiful car repaired ASAP?

Blown Head Gasket @ 86,000 miles due to Block defect. Now I have to either pay to replace the Head Gasket with the expectation that it will fail again due to the block defect, or replace the whole defective block.

Engine - Blown head gasket This is a common issue with these engines and is a costly repair or potential engine failure.

I purchased this 2019 Ford Mustang Ecoboost 2.3L brand new in July 2019. It has been well maintained, regularly serviced by the authorized Ford Dealer where I purchase the car. It has never been in an accident, and has only 36,100 miles. This vehicle passed inspection last month. The check engine light came on, and then had rough cold starts. I have been informed by the service station that antifreeze is leaking into the engine, and a new engine is required (estimated cost of $11,000). After researching this matter, it appears that there is a design flaw with this vehicle, given the high number of similar occurrences with 2015-2019 Ford ecoboost vehicles. It is my understanding there is even a class action lawsuit related to this issue. Luckily, there was no accident resultant from this engine malfunction in my case, but the NHTSA should investigate this issue, given the high risk it poses to highway safety!

On Repair Order #:[XXX] at Lorenzo Ford, the dealership technician documented the following: “Verified customer concern, DTC P0304 perform pinpoint test, inconclusive, perform coolant pressure test and found coolant intrusion into cylinder 4.” This confirms a coolant intrusion defect causing misfire and overheating — exactly the well-documented issue affecting 2.3L EcoBoost engines that is now the subject of a pending class action lawsuit (filed June 2025). INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Check engine light on. Code is p0301 for multiple cylinder misfires. At startup I can hear coolant sloshing around and white exhaust. Coolant is leaking into cylinder 1. The Ford dealer says it needs a new engine. 2019 ford mustang ecoboost at 55k miles.

Since purchasing the vehicle (used) there had been several issues with the engine.

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 .

There is a coolant leak and that has caused significant damage to the engine due to a bad head gasket by poor manufacturing of the engine.

Took car into dealership because it was running rough at start up and check engine light came on. They told us today that coolant leaked into cylinder requiring head gasket repair and pissible engine replacement. The car has less than 40,000 miles, has been gently driven, with full service records from the dealership and the extended warranty just ended in July 2024. Reading online forums, this is a very common issue due to design flaw of the Ford Ecoboost engine. What recourse do we have?

Blown head gasket causing coolant to leak into the engine at 49,000 miles

My 2019 Ford Mustang Shelby GT350 was driving fine until all of a sudden I got a check engine light on the dash. The vehicle was not as responsive as usual and was shaking a little bit at idle. I shut the car off and then had it towed to the Ford dealership for further analysis. After inspection at a dealership it was identified, that my engine had failed. Cylinder 8 would not hold compression and had cracked the engine block. This failure can cause complete engine failure and can be a risk to the driver, passengers and anyone else in traffic.

While driving at approximately 40 MPH, my vehicle briefly sputtered, and the check engine light was on. The vehicle seemed to return to normal functionality afterward, but upon inspection at a FORD dealership, I was informed that coolant intrusion had caused damage to the engine. As a result, I was advised that the engine needs to be replaced. There are many others that have complained about this problem and to solution. My car has 81.5k miles on it.

Blown head gasket. 26k miles. Only 6 months outside of warranty. Car is lightly driven on local roads . Routine maintenance by dealer up until end of warranty.

The contact owns a 2019 Ford Mustang. The contact stated that a ticking sound was coming from underneath the hood of the vehicle while driving at various speeds and while the vehicle was idling. The contact stated that the RPM dropped while idling and while decelerating. There were no warning lights illuminated. The vehicle was taken to the dealer where it was diagnosed with a failure in the lifters inside the cam phaser. The vehicle was not repaired. The vehicle was taken to another dealer, Lithia Springs Ford (870 Thornton Rd, Lithia Springs, GA 30122), where it was diagnosed with the same failure. The dealer informed the contact not to repair the vehicle due to the engine's design being known to have the failure. The contact was informed that the failure was related to TSB: SSM52334, NHTSA ID Number: 10251951 (Engine and Engine Cooling). The vehicle had not been repaired. The vehicle had been taken to a certified mechanic who confirmed the diagnosis. The vehicle had not been repaired. The manufacturer was made aware of the failure. The manufacturer referred the contact to the NHTSA Hotline to file a safety complaint. The failure mileage was 94,000.