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Ford Mustang GT 1996-2004: How to Reset Your ECU

If the engine control unit (ECU) on your Ford Mustang needs to be reset, you won't need to hire a mechanic. You can complete the project on your own using the following simple instructions.

By Charlie Gaston - October 5, 2015

This article applies to the Ford Mustang GT (1996-2004).

Your Ford Mustang is equipped with an engine control unit (ECU) that controls the transmission on your vehicle. It works as part of the power-train control module (PCM), which is located in the passenger footwell, and it is shielded by plastic molding or a "kick panel" near the bottom of your car. If you need to reset your ECU, you won't need to tinker with very many components. However, you will need to pop the hood of your Mustang and carry out a few simple steps. All in all, this project will take you about 30 minutes. If you'd like professional assistance, you have that option as well. Here are some great tips for either option.

Materials Needed

  • Adjustable wrench

Step 1 – Disconnect the battery

  • Pop the hood of your Mustang.
  • Loosen the nut on your car battery.
  • Pull off the negative connector, which is black, and then pull off the positive connector, which is red.
  • Remove the battery.
  • Be careful not to let the terminals touch during the removal process.
  • Press the brake pedal several times.
  • Leave your car battery out of your Mustang for up to 20 to 30 minutes, and then reinstall it.
Figure 1. Disconnect and remove your car battery.

Step 2 – Drive your vehicle

Allow your vehicle some time to re-learn the values for optimum driving and performance. This could take up to several miles, but be patient as your PCM readjusts.

Figure 2. This is passenger-side kick panel in a 1994 Ford Mustang.

Step 3 – Visit a local Ford dealership (optional)

For professional assistance in resetting your car's computer, visit a local Ford dealership. The trip could set you back $375, but your dealer will also run your codes and reset your system, which includes registering your battery to your car's system. It's recommended that you call around to local garages, where you are likely to find a better deal. If your computer needs to be totally replaced, the cost could reach as high as $1,500; although the total cost could actually exceed that amount in many cases. Repair prices vary by geographical area, so take the above estimates as just that: estimates.

Figure 3. Make an appointment before driving on the lot for faster service.

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