So, when your vehicle's memory starts to fail, things start to go wrong. As a result, electronic modules are damaged. When the car battery is disconnected, the electrical system will experience a high voltage spike.If the engine is running or the ignition key is switched on, never detach the car battery. When the battery is removed, battery voltage must be maintained to the (PCM) and other modules.To reset car computer after replacing battery safely, take note of the following: So there are a few things to consider before disconnecting a car battery. Reset Car Computer After Replacing Battery: Important Tipsĭisconnecting a car battery for any purpose will result in unexpected results. Before you reset the ECU, make sure there are no issues with the battery cables and that you have a backup power source. These codes will lead you to the root of the issue, enabling you to begin removing parts in an effort to fix it.Īfter installing the new parts, you can continue to reset your computer so that the engine control can “learn” the new parts and store the new data. One method is to detach the battery cable for 2 to 3 minutes and then reconnect the battery and start the car and see if the check engine light comes back on.ĭrive the car for at least 10 miles to let the ECU know there's a problem if there is, the check engine light will come back on, and you can look at the fault code the ECM produces. So how do you go about the process to reset car computer after replacing battery. The Process to Reset Car Computer After Replacing Battery If you need to replace your vehicle's ECM, you have to consult your maintenance manuals or the owner's manual to make sure everything is done as it should.Įvery ECU (Engine Control units) can be reset and also should be reset at least once per manufacturer’s guideline so your vehicle can have a smooth relearning process upon installing a replacement component. This process should be done when any replacement parts are installed like a knock sensor or fuel filter, even after some work on your car's air conditioning or diagnostics has been completed.
So, before you disconnect the battery, look for any codes to make sure they're safe, as well as the drivability learning procedures.Īnother reason to reset car computer after replacing battery is for the ECM to know the new parts when replacements are done and be able to store the data. In many cars, however, disconnecting the battery will delete not only diagnostic trouble codes, but also the security, the drivability, and the radio codes you need. Reset car computer after replacing battery to clear the error codes and reset the check engine light as well. The easiest way to do this is with a scanner, but if you don't have one, simply disconnecting the batteries on many vehicles would suffice.
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