You need to start by identifying what exactly is causing the vehicle to be undrivable. Once you identify the cause you will be better able to pursue a remedy with the manufacturer (if appropriate). Either the dealership, or a trusted independent mechanic, should be able to assist you with this type of diagnostics test.If you find that the repair should have been covered under the extended warranty, you can start with the same process you went through for the ecm above (you need to go through this to start with), then, if it is unsuccessful, here are a few things you can try:File a dispute with the BBB - this is fast, easy, and free to you as a consumer (the BBB doesn't have any enforcement authority, so it is not always effective, but I offer it to customers because it takes relatively little investment and you don't compromise your claim by trying it): https://www.bbb.org/consumer-complaints/file-a-complaint/get-startedIf the BBB is unsuccessful, you can then move on to a breach of contract/products liability claim in small claims court (again, you need to identify the cause of the vehicle's current defect and the cost of repair, but hopefully you will fall within the small claims limit), a small claims case usually takes between 4-8 months to get to judgment, but it can result in both "declaratory relief" (forcing the dealer to fix the problem) or money damages (giving you money to pay a mechanic to do so).Short of filing a lawsuit, you can try to mediate the dispute with them - contact your local bar association and request referrals to mediators, a third party neutral can often help you reach a mutually agreeable resolution. Use the bar association's referrals to contact a mediator or two, the mediator will then contact the other party to set up a mediation
session, and you can go from there - hopefully resulting in a formal or written settlement agreement, and save yourself the time and expense of litigation.If the fix is very expensive, you may want to consider hiring a local attorney to help you level the negotiations
field. You can find local attorneys using the State and local Bar Association directories, or private directories such as www.AVVO.com; www.FindLaw.com; or www.Martindale.com (I personally find www.AVVO.com to be the most user friendly).