Which parts fail
Components named in complaints (battery, alternator, wiring, ignition, instrument cluster, infotainment).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2007 Ford Mustang owners, lightly cleaned up (personal details are redacted by NHTSA).
The contact owns a 2007 Ford Mustang. The contact stated that upon entering the vehicle, there was an abnormal clicking sound coming from an unknown location with the vehicle turned off. The contact became aware that the battery was completely drained. No warning lights were illuminated. The vehicle was taken to an independent mechanic, who determined that electrical components were draining the battery while the vehicle was turned off. The vehicle was not repaired. The manufacturer was notified of the failure but provided no assistance. The failure mileage was 30,000.
A complete failure of the electrical system due to a design flaw where a main electrical wire harness inside the firewall on the drivers side fills up with water over time and soaks the wire harness causing a complete failure of the car to operate. This leading to a breakdown in traffic and dangerous necessity to get out into traffic to escape electrical smoke.
The vehicle has experienced repeated and ongoing electrical system failures, including chronic battery drain that causes the vehicle to fail to start, erratic HVAC operation where controls do not function as intended, and persistent water intrusion into the doors and interior areas. The HVAC malfunction has resulted in the inability to properly defrost or defog the windshield while driving, significantly impairing visibility and creating an immediate safety hazard. These issues appear consistent with failure or corrosion of the Smart Junction Box (SJB) or related electrical control components. Replacement Smart Junction Boxes are unavailable through both Ford and aftermarket sources, preventing proper repair of the defect. …
The contact owns a 2007 Ford Mustang. The contact received two unknown recall repair notifications for the driver's and the passenger's frontal air bags. The vehicle was taken to the dealer and the unknown recall repairs were performed. The contact stated that when the vehicle was picked up from the dealer, the horn and the radio were inoperable. The vehicle was taken back to the dealer and the contact was informed that the vehicle could not be inspected for 8-16 weeks. In addition, the contact was informed that dealer appointments were booked. The contact stated that he recently contacted the dealer again; however, the dealer denied performing any recall repairs on the vehicle. The manufacturer was not made aware of the failure. The failure mileage was unknown. The VIN was unavailable.
As I was driving approximately 65mph/hour I hear a slight popping noise come from the from passenger tire and then followed the tires pressure dash light illuminated. I pulled off the road at my first opportunity. My ture had gone completely flat with out hitting any bumps or pot holes. I put the spare on and returned home. My boyfriend inspected the tire using soapy water and realized the air was escaping from the rim wall (str p245/40 r20) and not the tire itself. Upon further inspection we realized many stress factures on the rim on all four tires not just the one that lost all the air originally. I replaced my tires pirelli all season plus and scorpion verde tires with my stock tires. …
Car was parked in my driveway and after a rain storm I noticed the passenger floor was soaked with water. Water leaks in from the cabin air filter and drips onto the fuse junction box on the passenger side of the car. When drain holes in cowl gets clogged water builds up and then pours in the cabin filter then into passenger side flooding carpet. As water drips down it makes contact with the f j b and starts to mess with the electrical parts, ie power windows go up and down by themselves, dash light won't shut off, radio will not turn off and convertible roof keeps trying to go up and down. Only fix is to replace and reprogram the fjb but Ford no longer makes this part because of the known issues. I am told either to wait for replacement unit to be developed or buy a used one and hope it will work either way still have to pay $400.00 for part and $250.00 for reprogramming. …
Walk out to my car Saturday morning, battery was dead. I decided to buy a new battery. I installed it then went to a store. As I was coming back home, a fire started on the inside of the passenger side. I tried to make it home, but the smoke was getting to me, my windows wouldn't work. I finally made it home by that time a fire started blazing. I yelled at my wife to get a fire extinguisher. I manage to put out the flames. I have read on the web that numerous cars as mine has had the same problem. How come nothing has been done?? Is Ford just a big giant of a business that no one can touch them. If it was wasn't for us stupid people buying their product, they wouldn't have a business.
Tl* the contact owns a 2007 Ford Mustang. The contact stated that water leaked into the vehicle from the front windshield cowl and made contact with the electrical wires. The failure caused the gauges to malfunction, including the tire pressure monitoring sensor and the fuel gauge display. The cause of the failure was not diagnosed or repaired. The manufacturer was not notified of the failure. The failure mileage was 109,880. Updated 09/25/15
Tl* the contact owns a 2007 Ford Mustang. While turning on the headlights, the engine stalled. The contact stated that the vehicle could not be driven with the headlights activated. The vehicle was taken to an independent mechanic, but was not diagnosed or repaired. The manufacturer was made aware of the failure and informed the contact that the vehicle was no longer under warranty. The failure mileage was 85,000.
Tl* the contact owns a 2007 Ford Mustang. When the vehicle was parked, the contact turned the key between the accessory and off position and the engine started and the vehicle moved without touching the gears. Also, the brake lights, hazard lights, and headlights failed to illuminate. The dealer and manufacturer were not notified of the failures. The VIN was unknown. The failure mileage was 125,000.
Electrical complaints in other Mustang years
Frequently asked questions
How common are electrical problems on the 2007 Ford Mustang?
NHTSA has 33 complaints about the electrical system of the 2007 Ford Mustang, 5% of the model year's 615 complaints. The component named most often is horn (2 mentions).
Is there a recall for 2007 Ford Mustang electrical problems?
No. NHTSA lists no electrical system recall for the 2007 Ford Mustang, though it has 5 recalls for other components. If the problem is widespread, a repair may still be covered by an extended warranty or a manufacturer service bulletin — ask a dealer.
At what mileage do 2007 Ford Mustang electrical problems start?
Half of the complaints with a recorded mileage happened before about 64,000 miles, and 30% before 25,000 miles.
Is it dangerous?
Owners linked 0 crashes, 3 fires and 0 injuries to electrical system problems on this model year. If you notice symptoms, have the car checked before driving further.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.