Status on known 2026 Mustang defects and issues....are any of these resolved yet?

[OldCoastie]

(LONG POST)
I hope to take delivery late May or early June on a 2026 Mustang GT Premium Convertible. I have researched thoroughly 2026 issues, (some carried over from 2024, 2025). Appears that many ongoing owner complaints, defects, and issues I list below. I am hoping many of the more experienced owners are able to tell me if the noted issue has been resolved, or is still on ongoing issue that new owners should be concerned about:

Oil Leak: Specific to certain production batches, there is a confirmed recall affecting some 2026 Mustangs (including GT variants) for a potential oil leak due to a manufacturing issue in the cylinder head. Dealers will replace the cylinder head free of charge. Has this been addressed and resolved at the production level? Is this still an ongoing issue for newly produced Mustang GTs?

Computer/Infotainment Issues: Many owners of recent-generation Mustangs—including early reports for 2026 models—mention issues with infotainment and digital systems:

• Infotainment screen freezing, rebooting, or disconnecting Bluetooth/CarPlay.

• Digital instrument cluster glitches or intermittent failures.

Convertible Issues: Even before 2026 model-specific data is widespread, convertible owners (including 2024–2025 previews) have highlighted complaints that carry over:

• Hydraulic soft-top pump motor wear—early 2026 builds before a mid-year update had pumps prone to premature wear under rapid cycling.

• Rear window seal or attachment problems, potentially letting water into the cabin or the glass pulling away from the fabric.

Steering and Calibration Issues (ongoing since 2024), A few 2026 Mustangs built early in the model year reported to have some electronic power steering calibration issues, which could cause inconsistent assist levels at low speeds—especially noticeable with the top down. From what i could find dealers have a Technical Service Bulletin for a quick firmware update to address this. My concern has this been corrected at the factory when the cars are being built, anybody know about this?

Build and Fit Issues: Well Ford as well as others all have issues with build and fit issues but some of the 2026 owners late 2025 complained of the following:

• Panel alignment and trim fitment concerns that are typical for early production runs.

• Interior rattles or squeaks have been mentioned, though not widespread.

Build and fit doesn't really affect performance but can detract from perceived quality. Do you think this has improved as the 2026 cars are being built? Does Ford take this seriously? Do you consider this an going issue or has the build and fit improved?

Because the 2026 Mustang GT is part of the current generation (S650), real-world owner forums and recall data from recent years highlight issues that might still be relevant:


FINAL THOUGHTS: The following don’t necessarily reflect widespread 2026 failures, but I felt they are common themes worth mentioning on this post. Compiling my information I have see these not only on this Forum but on several other Forums. Have you experienced any of these issues.

• Transmission roughness/hesitation (especially in automatic 10-speed models) seen in earlier Mustangs.

• Electrical system quirks, including battery drain or random warning lights, from prior models.
• Water intrusion issues, reported on convertibles leading to electrical or HVAC problems.

Although these don’t necessarily reflect widespread 2026 failures, but they are common themes. I hope this forum takes this post seriously as this information took some time to compile this for your review. I am especially interest with those who have experienced any of these issues and have they been resolved. Also would like to know which ones Ford has resolved and not considered to be an ongoing problem but was sucessfully resolved.

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[armyGT]

Sometimes I wonder if Buying a 2024 GT Premium was a mistake especially when I see so many FORD recalls. I'm waiting until good weather to have my water intrusion issue recall down. It seems as though all car makers have created a true monster with all the technical things they add to a car or truck that aren't tested or proven. We are being treated as not buyers but testers. Let us find the faults, not engineering. It's cheaper for the company to do it this way.
Good luck with your 2026 Convertible. I hope you have many trouble free miles!!!

 

[OldCoastie]

Thank you, and hope all of yours are resolved promptly. I bought a C7 Corvette first year, owned it for 11 years and not a single issue. First Ford, Mustang, so hoping for the best. Cheers.

 

[Skye]

https://www.nhtsa.gov/recalls?vymm=2025 ford mustang

This is a search I did on the 2025, 7G. It not only lists active recalls, but TSBs.

For the 2025, there are three open recalls and 29 TSBs.

https://www.nhtsa.gov/recalls?vymm=2026 ford mustang

The 2026 has one open recall and 0 TSBs. Being a new Model Year, IDK if 25's will carryover.

 

[Will2]

I am that annoying obsessively detail-oriented person. My personal experiences:

'24 Ecoboost
- engine burned foam insulation under hood on passenger side (no clue why, traded car in at 8 months)
- coolant mysteriously disappearing (cap allows evaporation/leakage as designed? Many posters report low/decreasing coolant levels even after top-up)
- front fender liner holes (known issue, tons of threads on this, fixed mid-way model year '25)
- IPC (gauge screen) randomly dies, known recall
- 10R80 shuddery/jerky (I know ppl say it's much better than S550 but I owned the co-developed 10L80 in a Camaro and it was night-and-day better)
- rear axle pinging noise (known issue since S550s, see Ford "SSM 52444")
- brake booster clicking repeatedly, sounds/feels like you broke plastic on the brake pedal. Known issue, many posters
- driveline shock upon warm-start sometimes, car may even jerk (many posts on this)
- ripples in rear bumper along seam lines, due to plastic molding error
- rear glass scratches from factory (looks like someone scribbled back and forth several times in a continuous line)
- poor alignment of hood-to-fenders and hood-to-bumper (adjust by twisting the rubber 'bumpstops' under the hood)
- poor fitment of plastic dash trim piece under the gauge screen, R side high or gapped on ~30-50% of S650s I've seen
- imperfect alignment of steering wheel from factory, requiring being 2-4° clockwise for car to track perfectly straight, noticed this on ~50% of S650s I've driven, on various roads/crowning/etc.
- Mine did not have this, but many early models had gaps between front bumper cover and a headlight
- My rear trunk latch cover (plastic piece) was not properly installed, fell off repeatedly
- engine/radiator cover plastic with MUSTANG letters gets melty after a hot drive--touching the MUSTANG letters will leave permanent streaks in the plastic because it became soft/moldable
- rear seat latch rattle, esp over bumps or chassis flex (speedbumps, uneven road surfaces). This was fixed on '25s (they added lube)
- rattles galore
- water pools up on driver's side plastic trim near windshield wipers (like after a carwash, rain, etc.). '25s+ have a hole drilled there now to allow water drainage

'25 GT
- transmission output shaft splines not lubricated causing clunking when coming to a stop (during 3-->1 downshift on the auto), many ppl had this
- coolant mysteriously disappearing (cap allows evaporation/leakage as designed? Many posters report low/decreasing coolant levels even after top-up)
- poor fitment of passenger fender, sticks out laterally slightly more than the front bumper at the seam where they meet (noticed this on most S650s, even brand new dealer photos)
- driveline shock upon warm-start sometimes, car may even jerk (less often on my '25 but still happens)
- 10R80 still too shuddery/jerky in my opinion, have owned 10L80 Camaro and it was night-and-day better
- imperfect alignment of steering wheel from factory, requiring being 2-4° clockwise for car to track perfectly straight, noticed this on ~50% of S650s I've driven, on various roads/crowning/etc.
- rattles from rear passenger C-pillar area
- Zinc? coating on rear brake calipers burned off by acid wheel wash during dealer PDI, multiple posters have reported early corrosion/fading of rear brake caliper coating
- clearcoat on wheels oxidized with tons of tiny bubbles due to acid wheel wash during dealer PDI
- random paint chips, nicks, scratches even on brand new cars at the dealer, mine included

 

[Skye]

https://www.mustang7g.com/forums/threads/new-car-acceptance-checklist.158844/

 

[AZ_Ryan]

(LONG POST)
I hope to take delivery late May or early June on a 2026 Mustang GT Premium Convertible. I have researched thoroughly 2026 issues, (some carried over from 2024, 2025). Appears that many ongoing owner complaints, defects, and issues I list below. I am hoping many of the more experienced owners are able to tell me if the noted issue has been resolved, or is still on ongoing issue that new owners should be concerned about:

Oil Leak: Specific to certain production batches, there is a confirmed recall affecting some 2026 Mustangs (including GT variants) for a potential oil leak due to a manufacturing issue in the cylinder head. Dealers will replace the cylinder head free of charge. Has this been addressed and resolved at the production level? Is this still an ongoing issue for newly produced Mustang GTs?

Computer/Infotainment Issues: Many owners of recent-generation Mustangs—including early reports for 2026 models—mention issues with infotainment and digital systems:

• Infotainment screen freezing, rebooting, or disconnecting Bluetooth/CarPlay.
• Digital instrument cluster glitches or intermittent failures.

Convertible Issues: Even before 2026 model-specific data is widespread, convertible owners (including 2024–2025 previews) have highlighted complaints that carry over:

• Hydraulic soft-top pump motor wear—early 2026 builds before a mid-year update had pumps prone to premature wear under rapid cycling.
• Rear window seal or attachment problems, potentially letting water into the cabin or the glass pulling away from the fabric.

Steering and Calibration Issues (ongoing since 2024), A few 2026 Mustangs built early in the model year reported to have some electronic power steering calibration issues, which could cause inconsistent assist levels at low speeds—especially noticeable with the top down. From what i could find dealers have a Technical Service Bulletin for a quick firmware update to address this. My concern has this been corrected at the factory when the cars are being built, anybody know about this?

Build and Fit Issues: Well Ford as well as others all have issues with build and fit issues but some of the 2026 owners late 2025 complained of the following:

• Panel alignment and trim fitment concerns that are typical for early production runs.
• Interior rattles or squeaks have been mentioned, though not widespread.

Build and fit doesn't really affect performance but can detract from perceived quality. Do you think this has improved as the 2026 cars are being built? Does Ford take this seriously? Do you consider this an going issue or has the build and fit improved?

Because the 2026 Mustang GT is part of the current generation (S650), real-world owner forums and recall data from recent years highlight issues that might still be relevant:


FINAL THOUGHTS: The following don’t necessarily reflect widespread 2026 failures, but I felt they are common themes worth mentioning on this post. Compiling my information I have see these not only on this Forum but on several other Forums. Have you experienced any of these issues.

• Transmission roughness/hesitation (especially in automatic 10-speed models) seen in earlier Mustangs.
• Electrical system quirks, including battery drain or random warning lights, from prior models.
• Water intrusion issues, reported on convertibles leading to electrical or HVAC problems.

Although these don’t necessarily reflect widespread 2026 failures, but they are common themes. I hope this forum takes this post seriously as this information took some time to compile this for your review. I am especially interest with those who have experienced any of these issues and have they been resolved. Also would like to know which ones Ford has resolved and not considered to be an ongoing problem but was sucessfully resolved.

I have not experienced any of those issues. Nor have I heard of any of those issues on this forum outside of the infotainment stuff, which is pretty common in most new cars.

Sometimes going down the rabbit hole on car forums causes more stress and worry than reality warrants. I say enjoy the wait and dont try to find things wrong with your car before you take delivery of it.

 

[Starship Enterprise]

My 25 had bad white spots on the wheels with 4 miles on it. Took several wipes and waxes to get them off. Wheels also had some chips which I just touched up.

The vacuum hoses were not secured well and just flopped around under the hood. I secured with zip ties and called it a day.

Trans only jumps and clunks on start up if driven aggressively beforehand in my experience.

Coolant does seem to slowly drop in level for some reason.

Other than that car seems solid with no clunks and rattles, except for one time I got a loud clunk coming from driver side rear under the car somewhere as I was just driving a steady 50 MPH. Never figured that one out.

Love this car and still shocked how many people stop me in parking lots to compliment it.

As far as your upcoming purchase....don't over think it. You're either going to get a good one or one with a few issues. That's going to happen no matter what car you buy from any brand.

 

[MAT1955]

@Will2 ..... I am sure you know the Camaro and Mustang share the 10R80 as a common transmission with one minor i=change where GM added some sound deadening material. Otherwise they are the same.

 

[AZ_Ryan]

I am that annoying obsessively detail-oriented person. My personal experiences:

'24 Ecoboost
- engine burned foam insulation under hood on passenger side (no clue why, traded car in at 8 months)
- coolant mysteriously disappearing (cap allows evaporation/leakage as designed? Many posters report low/decreasing coolant levels even after top-up)
- front fender liner holes (known issue, tons of threads on this, fixed mid-way model year '25)
- IPC (gauge screen) randomly dies, known recall
- 10R80 shuddery/jerky (I know ppl say it's much better than S550 but I owned the co-developed 10L80 in a Camaro and it was night-and-day better)
- rear axle pinging noise (known issue since S550s, see Ford "SSM 52444")
- brake booster clicking repeatedly, sounds/feels like you broke plastic on the brake pedal. Known issue, many posters
- driveline shock upon warm-start sometimes, car may even jerk (many posts on this)
- ripples in rear bumper along seam lines, due to plastic molding error
- rear glass scratches from factory (looks like someone scribbled back and forth several times in a continuous line)
- poor alignment of hood-to-fenders and hood-to-bumper (adjust by twisting the rubber 'bumpstops' under the hood)
- poor fitment of plastic dash trim piece under the gauge screen, R side high or gapped on ~30-50% of S650s I've seen
- imperfect alignment of steering wheel from factory, requiring being 2-4° clockwise for car to track perfectly straight, noticed this on ~50% of S650s I've driven, on various roads/crowning/etc.
- Mine did not have this, but many early models had gaps between front bumper cover and a headlight
- My rear trunk latch cover (plastic piece) was not properly installed, fell off repeatedly
- engine/radiator cover plastic with MUSTANG letters gets melty after a hot drive--touching the MUSTANG letters will leave permanent streaks in the plastic because it became soft/moldable
- rear seat latch rattle, esp over bumps or chassis flex (speedbumps, uneven road surfaces). This was fixed on '25s (they added lube)
- rattles galore
- water pools up on driver's side plastic trim near windshield wipers (like after a carwash, rain, etc.). '25s+ have a hole drilled there now to allow water drainage

'25 GT
- transmission output shaft splines not lubricated causing clunking when coming to a stop (during 3-->1 downshift on the auto), many ppl had this
- coolant mysteriously disappearing (cap allows evaporation/leakage as designed? Many posters report low/decreasing coolant levels even after top-up)
- poor fitment of passenger fender, sticks out laterally slightly more than the front bumper at the seam where they meet (noticed this on most S650s, even brand new dealer photos)
- driveline shock upon warm-start sometimes, car may even jerk (less often on my '25 but still happens)
- 10R80 still too shuddery/jerky in my opinion, have owned 10L80 Camaro and it was night-and-day better
- imperfect alignment of steering wheel from factory, requiring being 2-4° clockwise for car to track perfectly straight, noticed this on ~50% of S650s I've driven, on various roads/crowning/etc.
- rattles from rear passenger C-pillar area
- Zinc? coating on rear brake calipers burned off by acid wheel wash during dealer PDI, multiple posters have reported early corrosion/fading of rear brake caliper coating
- clearcoat on wheels oxidized with tons of tiny bubbles due to acid wheel wash during dealer PDI
- random paint chips, nicks, scratches even on brand new cars at the dealer, mine included

Sounds like you owned two of the worst Mustangs ever made.

 

[Gregs24]

@Will2 ..... I am sure you know the Camaro and Mustang share the 10R80 as a common transmission with one minor i=change where GM added some sound deadening material. Otherwise they are the same.

I'm not sure that is quite correct as there have been different minor versions of the 10R80. If nothing else the stop start versions have an additional electric pump fitted so even 10R80's used by Ford will be 'different'.

 

[Gregs24]

Mine had the rear glass 'scratches' on the inside and more developed with time - they wiped off however so they were not scratches just static film deposits.

Front fender - yes I have the minor alignment issue where it joins the wing but very minor.

It is a mass produced car manufactured at speed. Having said that I have also had 'hand made' cars as well and they are very similar.

I just drive mine every day and enjoy it for what it is.

 

[OldCoastie]

Wow great advice and responses. I really am looking forward to getting my first Mustang after having owned six Corvettes and six Camaros over the years. I understand these are mass produced cars and do have small issues, but what I am concerned about are oil leaks from the factory that should not happen, or software glitches. I was in the IT field for a very long time, and there should not have some of the issues that I am reading about, beta testing should have revealed these on/off, reset issues. However, it is what it is, and I am just interested to know on my original post, what issues I noted are fixed and what issues SHOULD I EXPECT when taking delivery in late May. BUT Love the list of taking deliver, that checklist is very valuable during Delivery Day. THANKS EVERYONE for all your input and experiences.

 

[SSuperDave]

I work in service at a Ford dealer, and other than the panel fit issues, I have not seen any of the items on the list. YMMV

 

[OldCoastie]

I work in service at a Ford dealer, and other than the panel fit issues, I have not seen any of the items on the list. YMMV

That is great news, but I know for fact the following:

• 2025–2026 Mustang recall (NHTSA Recall No. 25V828000 / 25SD3) — Ford issued a safety recall covering certain 2026 Mustangs (including S-650 models built for sale) due to improperly manufactured cylinder head components.
  • Defective ball plugs in the cylinder head could allow engine oil to leak out and drop onto hot engine/exhaust parts, posing a fire risk.
  • Remedy: Dealers will replace the cylinder head assembly at no charge.
• This recall is typically done before vehicles reach end customers (still in inventory), so many owners may never see the notification letter — but if you bought a new 2026 or late-build 2025 Mustang from dealer stock, it’s something to check via VIN with Ford.

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