2021 Ford Mustang Problems: 9 Known Issues
2021 model year · 20,740+ owner reports · Updated October 2026
According to Au7o's analysis of 20,740+ owner reports, the 2021 Ford Mustang has 9 documented known issues, with 1 rated critical. The most serious is MT82 Manual Transmission Grinding and Shifting Issues ($150-$6,000 repair). The most commonly reported issue is 5.0L Coyote Engine Tick/Knock Noise at Idle with 8,000 owner reports. Across all issues with published estimates, repair costs range from $20 to $7,000. DIY maintenance guides at au7o.io.
2021 · GT · All engines
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All 9 Known Issues
NHTSA Recalls19 recalls
POWER TRAIN:AUTOMATIC TRANSMISSION
Ford Motor Company (Ford) is recalling certain 2022-2023 F-150, Mustang, Explorer, Bronco, and 2023 Lincoln Aviator vehicles equipped with automatic transmissions. The transmission may contain a loose bolt which could prevent the transmission from engaging the park gear, although the gear shifter position may indicate that the vehicle has been shifted to "PARK."
ELECTRICAL SYSTEM:BODY CONTROL MODULE/BCM
Ford Motor Company (Ford) is recalling certain 2020-2023 Mustang vehicles. The brake fluid level sensor may not activate the visual warning indicator when the brake fluid is low. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 135, "Light Vehicle Brake Systems."
STEERING:ELECTRIC POWER ASSIST SYSTEM
Ford Motor Company (Ford) is recalling certain 2022-2023 Ford Mustang vehicles. The secondary steering torque sensor may not be calibrated properly, which can cause the steering wheel to turn side to side against the driver's intentions.
STEERING:ELECTRIC POWER ASSIST SYSTEM
Ford Motor Company (Ford) is recalling certain 2022-2023 Ford Mustang vehicles previously repaired incorrectly under recall number 24V-493. The secondary steering torque sensor may not be calibrated properly, which can cause the steering wheel to turn side to side against the driver's intentions.
BACK OVER PREVENTION:SOFTWARE
Ford Motor Company (Ford) is recalling certain 2018-2022 Transit Connect, 2019-2020 MKZ, MKX, Edge, Continental, F-150, Nautilus, Fusion, 2019-2023 Ranger, Mustang, 2020-2021 EcoSport, Expedition, Navigator, 2020-2022 Escape, F-250 SD, Corsair, 2020-2023 Aviator, Transit, 2020-2024 Explorer, 2021-2024 Bronco Sport, and 2022-2024 Maverick vehicles. A software error may cause the rearview camera to display a blank image, or the image may remain on the display after the backing event has ended.
+ 14 more recalls. Check all on NHTSA.gov
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Frequently Asked Questions
What are the most common Ford Mustang problems?
According to Au7o's analysis of 20,740+ owner reports, the 2021 Ford Mustang has 9 documented issues. The most frequently reported are: MT82 Manual Transmission Grinding and Shifting Issues, Independent Rear Suspension Clunk and Noise Over Bumps, 10R80 10-Speed Automatic Harsh Shifting and Hesitation. Of these, 1 is rated critical and should be addressed promptly.
Is the Ford Mustang reliable?
The 2021 Ford Mustang has 9 known issues documented across 20,740+ owner reports. 1 issue is rated critical: MT82 Manual Transmission Grinding and Shifting Issues. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
How much does it cost to fix common Ford Mustang problems?
Repair costs for known Ford Mustang issues range from $0 to $7,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, MT82 Manual Transmission Grinding and Shifting Issues, typically costs $150-$6,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 2015-2023 Ford Mustang MT82 Manual Transmission Grinding and Shifting Issues?
The MT82 6-speed manual transmission is notorious for multiple issues including gear grinding (especially 1st to 2nd and into 3rd gear when cold), high RPM lockout preventing shifts, notchy/difficult shifts, premature synchronizer wear, and in severe cases complete transmission f… Repairs typically run $150-$6,000. Severity: high.
What is the 2015-2023 Ford Mustang Independent Rear Suspension Clunk and Noise Over Bumps?
The S550 Mustang's independent rear suspension (IRS) is prone to developing clunking or knocking noises when going over bumps, accelerating from a stop, or during cornering. Common causes include loose sway bar end links, loose subframe bolts, worn or binding shock mounts, loose… Repairs typically run $50-$600. Severity: medium.
What is the 2018-2023 Ford Mustang 10R80 10-Speed Automatic Harsh Shifting and Hesitation?
The 10R80 10-speed automatic transmission exhibits issues including harsh or jerky shifting, gear hunting (constantly searching for the right gear), hesitation during acceleration, unexpected downshifts, and transmission whining. The transmission's aluminum outer shells can devel… Repairs typically run $0-$7,000. Severity: medium.
What is the 2015-2023 Ford Mustang Backup Camera Intermittent Failure and Black Screen?
The backup camera frequently exhibits intermittent operation, showing a black or blank screen when reverse is engaged. The issue is often caused by wiring being pinched in the trunk lid, corroded connections at the rear license plate light area, or a failing camera unit. Repairs typically run $50-$600. Severity: medium.
What is the 2015-2021 Ford Mustang P0430 — Bank 2 Catalytic Converter Efficiency Loss (Driver-Side Cat, TSB 19-2201)?
P0430 is the Bank 2 (driver-side) mirror of P0420 on the 5.0L Coyote Mustang. On 2018-2019 5.0L cars with the automatic built on or before April 23, 2019, Ford TSB 19-2201 covers P0430 (and/or P0420) when it is the only stored code, stating it may be due to the operation of the P… Repairs typically run $120-$1,600. Severity: medium.
What is the 2015-2023 Ford Mustang 5.0L Coyote Engine Tick/Knock Noise at Idle?
Two distinct tick patterns affect 5.0L Coyote V8 in 2015-2023 Mustang depending on engine generation. Gen 2 Coyote (2015-2017): light tick at idle and on cold start, commonly attributed to valve lash / lifter operation; generally cosmetic and not associated with engine damage. Ge… Repairs typically run $0-$3,000. Severity: low.
What is the 2016-2023 Ford Mustang SYNC 3 Infotainment Freezing/Black Screen?
The SYNC 3 infotainment system can freeze, display a black screen, or reboot randomly. This affects navigation, audio, and climate control displays. Issues are often caused by software bugs or APIM (Accessory Protocol Interface Module) hardware failures. Repairs typically run $0-$1,200. Severity: low.
What is the 2015-2023 Ford Mustang HVAC Blend Door Actuator Failure?
The HVAC blend door actuators can fail, causing clicking noises from the dashboard, inability to control air temperature, or air only blowing hot or cold. The actuators are plastic and prone to gear stripping. Multiple actuators may fail over time. Repairs typically run $50-$400. Severity: low.
What is the 2015-2023 Ford Mustang P0442 — Small EVAP Leak from Failing Canister Purge Valve (Recurring Revised Part)?
On the S550 Mustang (both 2.3L EcoBoost and 5.0L GT), P0442 (small EVAP leak) is commonly blamed on the canister purge valve solenoid. EcoBoost owners report installing a purge valve that immediately sets a light, then a second or third valve that clears it; however, Ford's SSM 5… Repairs typically run $20-$350. Severity: low.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.