2017 Ford Mustang transmission problems

Filed Nov 1, 2026 · Acceleration, Transmission · LA

2017 Ford Mustang EcoBoost unintended downshift; potential relevance to Ford Recall 26S28 / the federal safety agency Recall 26V237 and Investigation EA26001 I am submitting a vehicle safety complaint concerning a sudden, unintended downshift in my 2017 Ford Mustang EcoBoost while traveling on Interstate 10 with my wife and son. I request that Ford investigate my vehicle and that the federal safety agency evaluate whether the lead-frame safety concern addressed by Recall 26S28 / 26V237 may also affect Mustang vehicles and other Ford models equipped with related 6R80 transmission components. On 9/26/2026, while driving on interstate I-10 in New Orleans approximately 60–70 mph, my vehicle suddenly and erratically downshifted to what appeared to be first or second gear. I could not independently verify the precise gear during the emergency. As I attempted to reach the shoulder, the vehicle remained in a low gear, which I understood to be second, and eventually entered limp mode. The abrupt change in speed and inability to accelerate normally created a near-collision situation with other vehicles traveling at interstate speeds. My wife, son, and I were placed in immediate danger. Before this event, I had noticed no signs of transmission trouble. I brought the vehicle to Supreme Ford of Slidell for diagnosis. After the dealership had the vehicle for more than a week, a service representative told me that it needed a replacement transmission costing more than $10,000. Based on my subsequent discussions with the dealership, I understood that the recommendation relied on a diagnostic scan showing a Shift Solenoid A fault. I was not provided with an explanation of additional testing establishing why replacement of the complete transmission was necessary. I returned the vehicle to my garage for further investigation. I tested all existing transmission solenoids, and all passed the testing I performed. Based on those results and my subsequent repair outcome, I identified the molded lead frame as the source.

Filed Sep 11, 2025 · Transmission · NJ

I am bringing in my 2017 Ford Mustang EcoBoost Premium due to a serious transmission problem. The vehicle’s 10R60 / 10R80 automatic transmission becomes stuck in Drive/Sport mode and fails to shift properly, which is a significant safety concern since it prevents me from reliably selecting Park or Neutral when needed. I am aware of multiple Ford Technical Service Bulletins (TSBs) and updates related to this transmission family, including but not limited to: - TSB MC-10236680 (May 30, 2023) – 10R60 / 10R80 Automatic Transmission – Harsh/Delayed Engagement And/Or Harsh/Delayed Shift - Identifies PCM/TCM software issues, solenoid strategy concerns, sticking valves in the main control valve body, and axial movement of the CDF clutch cylinder sleeve. - Calls for PCM/TCM reprogramming, adaptive learning drive cycles, and in some cases valve body or clutch component replacement. - TSB 23-2250 (2023) – 10R60/10R80 Harsh/Delayed Shifts / Engagement - Describes corrective procedures including Transmission Accelerated Main Control Break-In routine, adaptive learning cycles, and parts replacement if necessary. - TSB 18-2079 (2018) – 10R80 Harsh/Delayed Shifts, DTC P0711 - Calls for PCM reprogramming to correct transmission shift concerns. Given these official Ford bulletins acknowledge issues with this transmission design, I am requesting that the dealership: 1. Check for and apply all available PCM/TCM software updates as outlined in the above TSBs. 2. Perform adaptive learning drive cycles or Transmission Accelerated Main Control Break-In procedures where applicable. 3. Inspect for valve body or CDF clutch cylinder defects if symptoms persist. 4. Confirm whether this VIN is covered for these repairs under TSB or goodwill consideration, given the clear overlap between my symptoms and Ford’s published bulletins. Because this is a safety issue (vehicle stuck in gear, inability to properly engage Park/Neutral)

Filed Mar 14, 2025 · Transmission · PA

My 2017 ford mustang gt has 27,000 mile on it. I was driving home from work and just went through a traffic circle and I was in 1gear when I went to shift I could not shift. The clutch blew apart while driving normal and it is the factory clutch. Pictures of the equipment involved are available and show no sign of wear or abuse just that it separated. This could have been a major is had I been on a major highway when it happened

Filed Aug 13, 2024 · Steering, Transmission · FL

I was driving at 70mph and the steering wheel locked without any error showing on the dashboard. Ford could not find a fault when it was connected to a computer. Later after a test drive they confirmed it was the Electronic power assisted gear assembly fault.

Filed Mar 21, 2024 · Transmission · LA

6speed manual transmission defect won’t go in 5th ,6th gear

Filed Nov 1, 2023 · Engine, Transmission · 101,000 miles · TX

The contact owns a 2017 Ford Mustang. The contact stated that while driving at an undisclosed speed, the vehicle lost motive power while driving sluggishly. The check engine warning light was illuminated. The vehicle was taken to the dealer, who determined an increased bore size for cylinder #2, which was allowing an abnormal amount of coolant to flow into the engine. The vehicle was not repaired. The manufacturer was notified of the failure but referred the contact to the federal safety agency Hotline for assistance. The failure mileage was 101,000.

Filed Oct 7, 2023 · Engine, Transmission · CA

June 2022, approx. 53000 miles, misfire codes. Replaced spark plugs. Codes continued intermittently. January 2023 car was inspected due to heater inop at 61228 miles. Coolant low and misfires. No repairs, just coolant added. I topped off coolant 3X until April of 2023 at 61631 miles, white smoke and damp smell from exhaust along with continuing misfires. Dealer stated water intrusion, engine and turbo bad. No warranty, less than 50% of cost covered by manufacturer. June 2023 car was returned to me. Back at dealer 4 days later, 61691 miles, rear end shudder. Bad rear differential. Manufacturer covered less than 50% of cost. All maintenance was performed at or earlier than warranty required including rear differential service at 33283 miles with Ford.

Filed Oct 7, 2023 · Engine, Transmission · CA

I was driving at 60mph when the transmission automatically downshifted to second gear while all sport modes were OFF and T/C was ON. Car was simply on drive, and after merging onto freeway and had completely let go of the accelerator pedal the car downshifted by itself no down shifting was done by the paddles. This is the 4th time my car does this and I have to upshift as fast as possible because RPMs go up as high at 7000. i’ve made some reading and looked at some TSBs looks like this issue has happened to other owners who their vehicle is equipped with the 6R80 transmission.

Filed May 21, 2023 · Transmission · WA

Car has a 6-speed manual transmission, which means it has a clutch and clutch pedal. The clutch pedal began squeaking when letting it up after engagement. Then it stopped depressing the plunger on the clutch engagement sensor preventing the clutch pedal to be depressed 100%. After inspection it was revealed the clutch pedal pivot point at the top where the pivot collar holds the pedal in alignment with the pedal assembly with the brake pedal is cracked. This forces the pedal to the left and out of alignment, which prevents the pedal from engaging properly when pressed, and fails to depress the pedal switch. This pivot connection is made via a weld where the collar goes through the pedal arm. This weld is insufficient and has cracked most of the way around the collar. The only way to continue using the pedal is to push the pedal to the right and take advantage of the increase lateral play while depressing it rather than straight up and down. It can prove challenging while leaving from a stop or stopping the car since the sensor plunger can hang up and not allow the clutch to be pressed in, which could make the driver to force the transmission out of gear to stop the car. This can be very challenging in first gear in heavy traffic.

Filed Oct 7, 2022 · Transmission · 94,000 miles · KS

The contact owns a 2017 Ford Mustang. The contact stated that while driving at an undisclosed speed, the vehicle was stalling with the powertrain malfunction light illuminated. The contact stated that the vehicle would no longer accelerate while depressing the accelerator pedal. The vehicle had not lost motive power but was inoperable. The vehicle was towed to an independent mechanic where it was diagnosed that the transmission needed to be replaced because there was no transmission fluid in the transmission. The contact stated that no warning lights were illuminated. Additionally, the contact was informed that two unknown cylinders also needed to be replaced. The vehicle was then towed to two other independent mechanics where the previous diagnosis was confirmed. The vehicle was not repaired. The manufacturer was made aware of the failure and a case was opened and the contact was advised to file a complaint with the federal safety agency Hotline. The approximate failure mileage was 94,000.