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Disconnect Car Battery To Clear Codes

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How to Disconnect a Car Battery to Reset the Computer. Locate any codes and have them and the drivability learning procedures on hand before disconnecting the battery. Step 1. Clean any corrosion off of the battery and terminals with a can of spray-on battery cleaner. Disconnect the negative battery cable and then the positive cable with a.

Disconnect car battery to clear codes.

unhooking your battery will clear your computer’s memory of stored codes. your computer tests different systems on your car on a preset “drive cycle”- each test runs when different driving conditions are met. some tests run as soon as the key is turned on, some take several key cycles and cold soak periods (car sitting overnight). the results.
Drive your car for around 15 minutes to bring it to its normal operating temperature. Now stop, open your car’s bonnet and remove the lead of earth from the battery. Make sure that the end of the lead is not in contact with any other metal surface of your car; Wait for 5 minutes.
Clear the trouble codes.. In some older cars it is possible to reset the airbag light without a scanner by removing the car battery terminals though. If you are repairing the problem, the airbag light will go away by itself in most cars.

How to Disconnect a Car Battery Prior to Replacing It. If you have to remove your car battery to replace it or to assess corrosion damage, it’s important to find out exactly how to disconnect car battery cables and clamps as safely as possible. The battery will not present too many challenges in most cases, especially if it’s only 3-4 years old.
How to Clear Codes Without a Scanner. If you decide to disconnect the battery I have an important tip for you. Most vehicles from 1996 and newer have a keep alive memory built-in to the computer system. Disconnecting the battery alone will not reset the check engine light.
On our 1995 Neon (yes, it was OBD2) disconnecting the battery or pulling the radio fuse for a few seconds would clear the codes. I expect that the 1997 would be the same. I think that what may be happening to you is that you are clearing the codes when you disconnect the battery, but that some code – not necessarily the one you are trying to.

Every time you start the car and to a greater extent when you start after reconnecting the battery, the ECU does a “digital handshake” with the sensors and controllers that it communicates with and if everything passes muster, then no codes are set. When the battery is disconnected some of the adaptions, such as electronic steering, are lost.
Use a settings keeper that will save computer codes, radio settings and other settings normally lost when disconnecting the vehicle’s battery. Most of these small units plug in to the cigarette lighter or the optional 12-volt plug-in port on many vehicles.
– Fix in the new battery with the memory minders hooked to the battery leads. This will enable restoring back of the memory. – Fix the battery bracket/holder back on as well with the help of a spanner. Step 5: Test the New Battery – You can then switch the vehicle on, to test whether the battery has been fitted well and if the radio is working.

The car is an ’03 V70 (2.4L non-turbo) and it is running poorly. No power when you accelerate hard. Does not idle rough, starts easily. No check engine light and no codes from the OBDII tool. If you keep the accelerator floored, the car begins surging at about 4500 rpm. I’ve replaced the plugs, cleaned the MAF, and cleaned the throttle body.
Why You Shouldn’t Disconnect the Battery. One of the more common ways that people go about resetting their vehicle’s check engine light is by disconnecting the battery, but this can be a huge mistake. Disconnecting the battery can cause all sorts of problems that you don’t want to deal with, so you should avoid it if at all possible.
Remove both battery cables (positive and negative) and then connect them together. You can do this with electrical tape, zip ties, or clamps. Keep the cables away from the battery terminals (using a bungee, you can “hang” them from the open hood as an option) and let them remain connected for at least half an hour.

If all you want to do is to clear the codes without reading them, disconnect the 12V battery for a few minutes and then reconnect it. #5 bobofky , Sep 17, 2012 jgavis Junior Member
Disconnect the negative battery cable using a `1.8 cm (3/4 inch) spanner to loosen the battery cable. The negative battery cable is the one that has black insulation on the wiring. Sometimes it is connected directly to the negative battery post, but some cars attach it directly to the car body.
You may also need to manually reset the light after making repairs if the code doesn’t clear automatically. The best way to reset a check engine light is to use a code scanner. However, if your vehicle was manufactured before 1996, you can simply disconnect the battery to reset the light.

Yes, disconnect both the pos and neg cables and touch them together for 5 seconds. This will clear/reset it. There’s also a way to reset the ECU on BMW e46 with the key and gas peddle.
Disconnecting the battery will not clear any codes in memory of the computer for stored OBD2 codes. The only way to clear the codes is to use a scanner and use the code clear function.
To disconnect a car battery, start by turning off the engine and opening the hood so you can access the battery. Wear eye protection when working with the battery to protect your eyes from sparks. Locate the positive and negative terminals on the battery.


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