2019 Ford Mustang Engine

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

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

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.

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!

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?

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

Coolant intrusion into cylinder 2 at 26,000 miles. Was told by mechanic this is due to thin cylinder wall design between cylinder 2 and 3. And the thin coolant channel cut between them. A new engine block manufactured after 2020 was recommended because the engine design was changed to fix this issue. My warranty expired 4 months prior so I had to fix myself.

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.

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)

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?

The contact owns a 2019 Ford Mustang. The contact stated while driving at undisclosed speeds and attempting to accelerate, the vehicle failed to accelerate as intended but started decelerating instead. During the failure, the contact would pull over to the side of the road, shift to park, turn off the vehicle, and then wait a while before restarting the vehicle for the vehicle to drive as intended. The failure also occurred while attempting to accelerate while idling. The contact stated that for several months during the failure, the check engine warning light was illuminated. The vehicle was taken to the dealer to be diagnosed, and the contact was informed that there was a misfire in cylinders #2 and #3. The dealer reset the computer to remove the code. The contact stated that three days later the check engine warning light was illuminated again. The vehicle was returned to the dealer who detected a misfire in cylinder #1. The spark plugs, crankshaft sensor, and coil packs were replaced. The check engine light was no longer illuminated; however, the failure persisted. The failure became more persistent, and the contact was pulling over to turn off and restart the vehicle more often. The contact had decided not to drive the vehicle due to the consistency of the failure. The dealer was contacted and confirmed that the failure was common for similar vehicles. The dealer diagnosed that the head gasket had failed; however, it was not recommended to be replaced due to the failure recurring after the repair was completed. The dealer recommended that the engine be replaced. The vehicle had not been repaired. The manufacturer was made aware of the failure and filed a case. The manufacturer confirmed that there was no recall on the VIN for the failure. The manufacturer referred the contact to the NHTSA Hotline to report the failure. The failure mileage was approximately 42,000.

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)

The contact owns a 2019 Ford Mustang. The contact stated that the check engine warning light remained illuminated, and upon inspection, the contact became aware that there was coolant leaking from the exhaust system. The vehicle was taken to a local dealer to be diagnosed, and it was determined that there was coolant intrusion into the engine. The contact was informed that the engine needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The approximate failure mileage was 54,807.

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.

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.

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.

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.

The contact owns a 2019 Ford Mustang. The contact stated while starting the vehicle, there was white smoke coming out of the exhaust pipe. There was no warning light illuminated. The vehicle was towed to the dealer, where it was diagnosed. The dealer determined that the head gasket replacement and a post repair inspection needed to be performed. The vehicle was not repaired. The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 130,000.

I had a solid check engine light 2 days ago and called my local Ford dealership and made an appointment for the next morning. I had not experienced any problems that I really noticed with the performance of the car, maybe some rough shifting. I waited at the dealership while the assessment was done and they said they would have to keep it overnight to do a head gasket test. They called this morning and said that I could come get the car if i needed it but I would need to keep a check on the coolant. I decided to leave the car at the dealership. After the call, I researched the web for similar issues that this particular mustang might have and I started to worry after the info I found and the similar comments on the 2019 mustang owners on this website.

The contact owns a 2019 Ford Mustang. The contact stated while driving or while the vehicle was parked, the vehicle was leaking coolant. The contact stated that while washing the vehicle, the contact became aware that coolant was leaking from the engine compartment. The vehicle was taken to the local dealer where it was diagnosed and determined that the coolant pipe needed to be replaced. The contact stated that the battery was replaced, the oil was changed, and an unknown software was updated. The manufacturer was notified on the failure but offered no assistance. The approximate failure mileage was 16,600.

Second oil pressure switch in less than three months. It is a pain to get to the oil pressure switch where it is located. The switch fails and shows that there is 130+ oil pressure. Freaks the computer out. Second switch in less than three months. Factory Ford switch GN1Z-90290-D 1X is the part number.

The contact owns a 2019 Ford Mustang. The contact stated that during a routine oil change, the technician observed that the coolant level was low. The coolant reservoir was filled however, the contact reported that when another oil change was made, the coolant level was again very low and was refilled. The contact stated no warning light was illuminated. However, the contact stated that he noticed a small cloud of white smoke emitted from the exhaust pipe when he started the vehicle one morning. The contact had taken the vehicle to a local dealer, where it was diagnosed and determined that coolant had intruded into cylinders #2 and #3 and that the head gasket was damaged and needed to be replaced. The vehicle was not repaired. The contact was advised by the dealer that this was a known failure with the 2.3-liter EcoBoost engine. The manufacturer was informed of the failure. The failure mileage was approximately 66,250.