Skip the auto shop - Our mechanics make house calls

Q: Changed battery, now the engine "chugs" at idle and while accelerating

asked by on

I changed out my dying car battery with a new one (of the type recommended for my car). The engine now "chugs" at idle and when accelerating and the "service engine soon" light comes on. Is this a computer problem? fuse problem?... nothing was wrong until I changed the battery.

My car has 140000 miles.
My car has an automatic transmission.

A: If you disconnected or connected the batter...

If you disconnected or connected the battery with the key on or any accessory activated then you may have damaged the computer of the car.

Firstly, have the Check Engine Light scanned to see what code is stored in memory. Then open the hood, turn the key off, remove the key, and then close and lock all of the doors. Afterwards, disconnect the battery ground cable and let sit for 10 minutes. Next, reconnect the ground cable and tighten the clamp. Open the door and restart the vehicle and let it idle for at least 3 minutes.

Put it in drive with A/C off and wait 3 minutes. Turn on A/C with vehicle in drive and wait 3 minutes. Road test normally to see if no lights come on and vehicle drives normal. If not then have a mechanic check it out for you to see if the ECM was damaged.

If you need help with this procedure, consider YourMechanic, as one of our mobile technicians can perform these checks and properly diagnose the Check Engine Light firsthand for an accurate repair.

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

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!

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: Hard to shift transmission

Hello there, many different faults can cause your 2006 Land Rover Range Rover to have hard shifting. The most common would be low transmission fluid, faulty shift solenoid, valve body failure, a wiring harness fault, or a transmission control module...

Q: Back latch not closing.

The lock actuator on these vehicles is known to fail. This could be your problem, but the vehicle would need to be inspected firsthand to know for sure. I suggest having trained professional from YourMechanic diagnose and repair your latch....

Q: Loud whine from the front of the engine, and has no power from my turbo. It also idles very high around 2000 rpm.

Check the hose from the MAF sensor to the throttle body and see if there is a leak or if the hose clamps are loose. This will produce a vacuum leak before the intake and make the engine run different...

Related articles

What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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.