11 C
Saturday, September 23, 2023

How Long to Leave Battery Disconnected to Reset Car Computer

Must read

Versatile writer with a passion for knowledge across diverse fields. Crafting compelling content that captivates readers and delivers valuable insights

The Dreaded Check Engine Light Is Something That Every Single Person Who Drives Has Encountered at Some Point. You Decide to Take Your Vehicle to The Mechanic, Who Informs You that There Is Nothing Wrong with Your Vehicle. Wonderful, in Your Opinion. so What Do We Do Now? you Have the Option of Paying for A Comprehensive Diagnosis of Your Vehicle, or You May Attempt Resetting the Ecu in Your Vehicle.

To determine whether or not you need an ECU reset, we will first explain what an ECU is, then discuss the benefits and drawbacks of resetting an ECU, and then instruct you on how to reset your ECU.

How long to leave the battery disconnected to reset the car computer

Find the negative battery terminal, which is often indicated by a black cover and a sign representing the negative charge (-). the terminal marked with a red positive (+) will be nearby. After removing the negative cable and setting it to the side, use a wrench to loosen the bolt that is attached to the negative terminal. Remove it from the battery for anything between 30 and 60 seconds.

How long do you keep the battery cords together?

Over the previous several years, I’ve had many concerns concerning what I believe to be a communication problem between modules, generally triggered by a low voltage scenario or after component replacement, or occasionally simply an unexpected event.

These are just a few examples of inquiries I’ve received that have been answered by the technique we’ll discuss below. I have a 1999 C5 Corvette with a six-speed manual gearbox. So, I observed that the engine had been turning over slowly in recent weeks, so I changed the battery; nevertheless, the Welcome Corvette sign no longer illuminates, and the engine spins over but does not start.

About Corvette

I assume a PassKey problem is preventing fuel pressure from being shown, however, it does not explain the lack of a display on the dash. My car is a 1998 Corvette. After a jump start, the gauges and the Drivers Information Center (DIC) are not functional. Question: My 2000 Corvette’s temperature will not adjust, so I changed the climate control head, but nothing works on the new climate controller.

  • I’ve also been asked multiple times whether I could drain the capacitors by touching the battery wires together.
  • When done properly, I have had no difficulties with this process.
  • Here’s how to do it: 1) Take the key out of the ignition.2) Remove both battery cables from the battery, starting with the negative cable.3) Disconnect the battery from the power supply.

Remove the battery from the car if it helps you feel more at ease.4) Connect the positive and negative battery connections for around 5 minutes. This will deplete all of the computer capacitors, forcing them to restart cold.5) Reconnect the battery wires to the battery, beginning with the positive cable.

  • Because this software seldom becomes corrupt, cold restarting should not affect the programming of any of the modules.
  • It is likely that you had an underlying issue with a computer or module previous to executing this method.
  • A broken computer or module might also occur as a result of a low-voltage scenario, such as a faulty battery or an alternator that is not charging properly.

Is it safe to leave the vehicle battery disconnected overnight?

Saves battery power: – Disconnecting a vehicle battery prevents electrical systems from draining, such as a clock or an onboard equipment/computer system. If a car and its battery are left unattended for an extended length of time, perhaps a month, the battery may be damaged and may need replacement.

What happens if you first unplug the positive terminal?

If you detach the positive terminal first, a single slip of your wrench might cause a deadly direct short to the ground. It is conceivable that you could feel a large spark, that the wrench will melt in your palm, or that the battery will explode!

Is it possible to reset codes by unplugging the battery?

Download this article With this easy technique, you can turn off that bothersome check engine light. Download this article When there is a problem with your emission control system or another computer-controlled system in your car, your check engine light will normally illuminate. However, if you’ve repaired the issue and it’s still on, you could be scratching your head, wondering what’s going on.

  • To clear the check engine light, insert an OBD-II scanner into your vehicle’s OBD port and reset it.
  • Reconnecting and disconnecting your battery will reset the computer in your car and clear the light.
  • After repairs, drive an older car around for a few days. When the computer is reset, the light will turn off on its own.
  • Turn the ignition to “on” 3-5 times, check your dashboard for any problem messages, or even turn off the light.

Is it safe to reset the computer in your car?

How Will Resetting Aid You? – Before you go through the hassle of repairing this component on your vehicle, you may want to understand what a reset might assist with. After all, it is a lot of labor. If you don’t need to reset, all of this may be superfluous. You may even end up ruining your vehicle. Resetting your auto computer, according to carroar.com, may benefit the vehicle by:

enabling you to start your vehicle’s engine How to Remove the Check Engine Light Repairing any erratic engine behavior removing any unusual burning odors or fragrances

All of these may benefit from repairing this equipment. That is why understanding how to reset your car’s computer is critical. If you suffer any of these issues, be sure to examine the car’s computer. A full reset will most likely assist you without requiring you to spend a large sum of money on a vehicle repair that may or may not be able to cure the issue.

Is it OK to just disconnect the negative terminal?

Will Disconnect the Negative Cable Cause the Car Battery to Drain? With the negative connection unplugged, a vehicle battery will self-discharge at a rate of 5-15% every month. However, keeping the battery attached while not in use will cause it to deplete at a rate of about 20% each week.

What happens if the battery is removed?

Disconnecting a vehicle’s battery may lead to expensive and unpleasant shocks for tire dealers and service business owners. In this and my next columns, I’ll go through the dangers of battery disconnect and offer prudent safeguards. Detaching a battery cable or cables abruptly may destroy memory — frequently referred to as learned values — that onboard computers have accumulated during regular drives.

After a technician reconnects the battery cable(s), the car may perform badly if these settings are deleted. Worse, a mechanic and/or shop foreman may be unaware of why the automobile is running worse than when it arrived. Remember that re-establishing these learned values may need extensive road testing.

It’s usually impossible to charge for this extra time on any individual repair work. Furthermore, requesting more time may seem suspicious to the automobile owner. The most expensive feature of this treatment, however, may be that it disrupts your service department’s already tight appointment schedule.

  • The more computers there are, the higher the danger of losing learned values if a battery is unplugged.
  • Furthermore, your tire store or service facility most likely fixes a broad variety of cars.
  • Experience has shown that it is difficult to forecast which computers on which cars are affected by a disconnected battery.


Disconnecting a battery may result in a bumpy or unsteady idle; it may also result in stalling because the idle speed is shallow. Disconnecting a battery, on the other hand, impacts transmission functioning, resulting in symptoms such as late and/or harsh shifts.

  • Trouble codes that display in systems such as ABS, traction control, and stability control following a battery removal are very upsetting.
  • I’ve also encountered incidents where a battery disconnect interfered with the functioning of “automatic-down” power windows.
  • Technicians and shop foremen may struggle with these difficulties since they don’t identify the new problems with a recent battery disconnect.

Should I make a positive or negative disconnect?

“First the positive, then the negative.” Disconnect the cords from the old battery by detaching the negative first, followed by the positive. Connect the new battery in the opposite direction, positive first, then negative.” It is not always simple to recall the sequence in which you separate and rejoin the terminals when changing your automobile battery.

Why is it necessary to always disconnect the negative first?

Negative first – It is critical to detach the negative side of the battery first since doing so might result in an electrical short. For example, if you drop a wrench on the positive connection and the spanner comes into contact with anything metal on the vehicle, you’ll short the battery or, worse, give yourself an electrical shock.

FAQ | How Long to Leave Battery Disconnected to Reset Car Computer

Will unplugging the battery cause the vehicle computer to be reset?

It is determined by the age of the vehicle and the kind of ECU utilized. Disconnecting the battery in some older automobiles may reset the system. In most modern cars, it does nothing except perhaps reset the clock and radio station settings.

How long do you leave the battery disconnected to reset the codes?

It will take some effort, but after you’ve detached the battery, leave it out for around fifteen minutes. Then, insert your key into the ignition and turn it to the “on” position three times. This should clear the data and turn off the light.

Will resetting the ECU clear the codes?

What happens when an ECU is reset? You may restore your vehicle’s factory settings by resetting the Engine Control Module. This will clear the car’s memory of any error codes or radio channels.

More articles


Please enter your comment!
Please enter your name here

Latest article