Q: My Check Engine Light came on 2 days after we replaced our battery

asked by on

Battery was bad so bought a new one 2 days after the check engine light came on

My car has 59789 miles.
My car has an automatic transmission.

The Check Engine Light may or may not be related to the battery change on any late-model car like this one - even a simple operation like changing a battery is not so simple. There are a number of settings and values in your cars control systems that are retained only by a very small amount of battery power while everything on the car is shut off. Disconnecting the battery for just enough time to replace it can cause the controllers to lose these values and it may take some time to re-learn some of them.

You need to read the codes on the car and if the code is for a throttle position sensor or an improper voltage, it may be because of your battery replacement. Other codes for "hard"failures may be present that have nothing to do with your battery replacement. To be sure, you can erase the codes and see if they re-occur. If the Check Engine Light does not come back, you’re in the clear. If the code is due to something that is unrelated, it will be back. But sometimes it may take a couple of days of driving. By contacting YourMechanic, you can have a technician come to your home or office with the proper equipment to read the codes and interpret them for you.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. My Check Engine Light came on 2 days after we replaced our battery

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: several warning lights on

Hello there, it is unusual for all of these lights to come on at one time with your 2004 Toyota Sienna. The most common cause of a malfunction that effects all these systems is an electrical one such as a...

Q: I'm hearing a whining noise from the front of the car.

Hi There, Generally speaking there are two things that can make a whining sound under the hood that would depend on the belt and the speed at which it turns. The alternator will tend to make a whining noise when...

Q: Steering problems. Alternator? Belts? Stupid car? Help!

I believe this vehicle has electric power steering. If you have a red battery light, it is possible that the alternator could be beginning to fail. I would recommend having your alternator inspected by a qualified professional to determine if...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.