Skip the auto shop - Our mechanics make house calls

Q: Why did my Check Engine Light come on after I replaced my battery?

asked by on

I replaced my battery and my check engine light came on it was not on before

My car has 68000 miles.
My car has an automatic transmission.

A: An illuminated Check Engine Light can be ca...

An illuminated Check Engine Light can be caused by several different components. First, make sure the replacement battery is the right type for your vehicle. Then check that the vehicle is properly connected to the battery. You should also make sure that the battery terminals are clean, though with the battery being new, this shouldn’t be an issue. Then verify that your battery cables are clean, dry, and tight. If these things all check out, you can be reasonably sure that the issue is not because of the new battery. Luckily, with the Check Engine Light on, the computer will be able to tell you which system is having a problem. The next thing to do is to have the vehicle scanned for diagnostic troubleshooting codes. This can be done for free at most automotive part supply stores. A certified technician, such as one from YourMechanic, can also perform this scan, and sometimes even have better equipment.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 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

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: Just had my transmission rebuilt and it's jerking while I shift 2013 Chevrolet Silverado 1500

Hello - modern automatic transmissions do have a "learn" process, which results in smoother shifting over a period of acceleration cycles. But, I would expect shifting to become pretty smooth within a week or so. If this is not the...

Q: Car cut off won't start

Hi there. It's possible that you might have an ignition system component failure, such as a worn out crankshaft position sensor or cam sensor, that will impact the vehicle's ability to start when you turn the engine over. It's also...

Q: Even though I replaced battery, car won't start.

If the battery is brand new and fully charged and the car turns over but will not start the battery is not the problem. The electrical aspect of the starting system is doing its job. Engines require fuel compression and...

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...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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.