Quick Answer: Can Disconnecting Battery Reset ECU?

What happens if you unplug the ECU?

However, if the ECU is unplugged, it will retain any charge it may have even if you create a power draw someplace else in the vehicle.

So you’d need to wait a decent amount of time to be “sure” it’s drained.

Some folks go so far as to unplug the battery and let the car sit over night..

Can I just swap ECU?

Yes. In fact, if you want to change the ECU for any reason, a dealer will have to reprogram your keys into the ECU.

Can you clear trouble codes by disconnecting battery?

The battery disconnect method will work on most vehicles. Some late model vehicles will not clear trouble codes by disconnecting the battery. On these vehicles trouble codes are stored in the ECM’s ROM, and only a scan tool will clear trouble code(s) and turn off the check engine or malfunction indicator lamp (MIL).

How long does a car battery need to be disconnected to reset the computer?

Because some of the electrical current is preserved in the computer for a while afterward, most sources recommend leaving the battery disconnected for at least 15 minutes to make sure the computer forgets the code before you reconnect the battery.

How long does it take for a car computer to reset?

The readiness monitors will remain until the car has been driven long enough for the computer to evaluate the various system and sensors. The amount of time can vary based on the vehicle. In some cases it can take up to 100 miles for all of the computer monitors to completely reset.

How long do I have to drive my car to reset the computer?

So why is the light still on? Here’s something you probably don’t know: after clearing the car’s computer you will need to drive for about 50 to 100 miles. As you drive your car the computer will monitor all the sensors and register the results.

What problems can a faulty ECU cause?

For example, poor performance or unexplained drops in fuel economy or efficiency are often related to onboard car computer problems, or faulty ECU issues. A damaged ECU can cause problems when shifting gears in an automatic transmission, or cause sudden jerking or stopping that’s similar to transmission problems.

Where is the ECU fuse?

Resetting your Engine Control Module through the Fuse Box The fuse box is located on the passenger side next to the battery. When your vehicle has properly warmed up then you want to turn your vehicle back off and unplug both fuses, cut power by disconnecting the battery .

What is a ECU fuse?

The electronic control unit (ECU) used in today’s cars and trucks is used to control the engine and other components’ functions. … The vehicle’s engine computer ECU is used to operate the engine by using input sensors and output components to control all engine functions.

How long do you leave battery disconnected to reset ECU?

It’s a real tight fit, but if you can find it and disconnect it, leave it disconnected for 30 seconds.

How do I reset my ECU without disconnecting the battery?

Easy Way to Reset ECU without battery disconnect With the key in your pocket/car, push the Engine Start button TWICE (so the car is fully on, but not started) Within three seconds of the car “ON” (again NOT started), Floor (all the way down) and Release the gas pedal fully 5 times within 5 seconds.More items…•

How do I test if my ECU is bad?

Here are the most common symptoms of a bad ECU:Check Engine Light stays on after resetting.Car was jump started on reverse polarity.Engine turning off for no reason.Water Damage or Fire Damage on the ECU.Apparent loss of spark.Apparent loss of injection pulse or fuel pump.Intermittent starting problems.Overheating ECU.More items…

How long does it take to reset car ECU?

Registered. If you don’t want to take my word for it then go to TMO.com and look up resetting the ECU. It only takes like 15 or 30 seconds.

What happens if you disconnect the positive terminal first?

If you begin to remove the positive side before the negative and your wrench would make contact with any part of the vehicle, then you could cause a short in the system. This could in turn blow fuses and relays or even damage some of the sensitive electronics on your 2016 Chevrolet Tahoe.

Does touching the battery cables together to reset computer?

Whenever you touch the battery cables together and drain the capacitors the clock will lose its memory, the radio stations will need to be reset, all fault codes will be cleared, the outside temperature may take some time to relearn, any systems with security codes will need to be reset and the computer will need to …