How do you know if you have a bad ECU computer in your car?

Answer

A bad electronic control unit often signals the driver by causing the check engine light to remain illuminated. This light comes on for a wide variety of reasons. When an automotive shop is diagnosing problems, its mechanics will generally retrieve the stored codes from the ECU using a scan tool.

If a car suddenly no longer starts, the ECU is sometimes at fault, according to CarsDirect. After checking the normal reasons a car does not start, such as battery and electrical components, the ECU is the next logical component to check.

Poor performance or a drop in fuel efficiency is sometimes due to a faulty ECU. If a driver suspects damage to the unit, the vehicle should be taken to a repair shop. Damaged units often stop working suddenly, leaving the vehicle stranded.

As of Aug. 5, 2012, CarsDirect reports the cost of diagnosis of a defective ECU as $150 to $300. Replacing the unit with a new one costs as much as $3,000, plus another $500 to $600 to install and program the computer. Repairing the unit, if possible, is usually a less-expensive option. With parts and labor, the cost to repair a unit is $300 to $750. Several online companies offer to repair a unit an owner ships to them at a cost of $300 to $400, including reprogramming the unit to work in the car.

Q&A Related to "How do you know if you have a bad ECU computer..."
your car will no longer work if the ECU dies.
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Bad ECUs are rare enough that it's hard to come up with a list of symptoms. If the check engine light comes on before you start the engine, the engine starts and the check engine
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I would check the alternator first, because the computer won't have
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The only way to condem a computer is by testing every component related to your problem. Then test the ground and power to the computer. Then clean every engine and body ground/ Then
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