Battery went low causing car to go into limp mode

I left car sitting for a while causing battery to go flat. Car windows locks wipers won't work now. I have put in new battery hoping it would reset but car still in limp mode. Do you know how to get car back to normal

My car has 200000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
There are a few things that can go wrong when the battery dies out like that. One thing you can try is to reset the main computer. Look to a service guide or repair manual for specific instructions on how to do that. The computer may have run out of the battery power used to store important information. If this isn’t computing correctly, the engine will sense a problem and trigger limp mode. Now if that doesn’t solve your problem, you should have your vehicle scanned for diagnostic troubleshooting codes. This is going to be the fastest way to see either what sensor is going bad, or if there is something more serious going on with the vehicle. There are several sensors that can go bad after sitting. You may also want to inspect your throttle position sensor.

How to Identify and Fix Common car Problems ?

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The computer may have run out of the battery power used to store important information. If this isn`t computing correctly, the engine will sense a problem and trigger limp mode.
The battery gives the electrical and computer systems power internally. Even if there is a lot of corrosion build up causing bad connections, the car can still get enough current to the circuit to start up. However, since there is such a low amount of voltage, this can create issues for the transmission.
Causes of Limp Mode

Faulty engine elements, including sensors and wiring. Excessive or reduced engine boost control. Issues with brake system wiring. Faulty transmission, including ineffective wiring.

This is because a car`s transmissions are operated through a computer system, which is powered by the battery. If the battery has corroded and the connections are starting to die, this may not shut the vehicle down, but can instead cause transmission problems off and on.
While a car`s engine performance is not affected by a weak battery, other parts of the car do suffer from a weak battery. When these components suffer, the overall performance of the vehicle suffers.
Most alternators have an internal voltage regulator. If the voltage regulator fails, it will cause the PCM to not function properly and in turn cause the problems you were experiencing, such as the vehicle going into LIMP mode.
Can a Bad Car Battery Cause Computer Problems? A faulty battery can have an impact on all of your automobile`s electronic components, including the car computer. If a malfunctioning battery is unable to provide the necessary electrical energy to a computer, it could result in issues.
1. At the top of all auto repair experts lists for causes of problematic transmissions is low transmission fluid. Usually caused by a leak somewhere in the system, low or contaminated fluid makes it nearly impossible for the transmission to automatically shift gears and run smoothly.
Speed sensors, the MAF, MPS and TPS; to name just a few of the essential monitors within your engine. All of these send signals to the control units, so as with faulty wiring, if one of these monitoring units is not functioning correctly, then it could send a message that causes the car to enter limp mode.
The only method to start an automatic car with a dead battery is to use a portable battery charger. If you drive an automatic car, make sure you have a simple portable charger in your roadside emergency toolkit.
Can a low car battery affect acceleration? No. The battery is just to start the engine. Once running, the alternator produces all the electricity the engine needs acceleration is provided by the fuel fed into the engine.
Yes, if your battery is underperforming it can cause systems within the vehicle to malfunction. A bad battery can also result in air conditioners, stereos and other applications not receiving enough power to function properly.
The reduced engine power warning light shows that something has reduced the flow of fuel and/or air to the engine. It often turns on when a car needs maintenance or repair and doesn`t mean your vehicle is about to break down, but it could be a good time for an oil change.
A: This fuse protects several circuits, including the transmission (exhaust-gas recirculation valve, backup lights and more). When it blows, the transmission reverts to “limp home” mode, essentially second gear. That is why the car seems sluggish.
Limp mode is a car security feature that activates when a fault is detected, reducing speed and switching off non-essential functions. It is triggered by abnormal signals from car components, such as faulty sensors, transmission issues, or low fluid levels.
A weak battery can affect almost any electrical component in your car, including the charging system. It`ll result in dimmer headlights and trouble when starting up the vehicle. Weak batteries can also affect your starter motor and alternator.
Problem Description

A weak battery or low battery voltage can cause the transmission to enter into fail safe mode.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Battery went low causing car to go into limp mode
ANSWER : There are a few things that can go wrong when the battery dies out like that. One thing you can try is to reset the main computer. Look to a service guide or repair manual for specific instructions on how to do that. The computer may have run out of the battery power used to store important information. If this isn’t computing correctly, the engine will sense a problem and trigger limp mode. Now if that doesn’t solve your problem, you should have your vehicle scanned for diagnostic troubleshooting codes. This is going to be the fastest way to see either what sensor is going bad, or if there is something more serious going on with the vehicle. There are several sensors that can go bad after sitting. You may also want to inspect your throttle position sensor.

What are the cause of my car going into limp mode and what can i do to fix it myself? 1998 Mitsubishi Eclipse
ANSWER : Hello – the first thing to do is to get the problem codes, whether the Check Engine light is illuminated or not. This will help you make repairs based on the real problem, rather than just throwing parts at it. Most auto parts stores will read codes for you for free on a "time-available" basis. Common problem which cause the limp mode condition include: failed speed sensor in the transmission, a faulty throttle position sensor (engine), and valve/solenoid problems in the transmission. Make sure the transmission fluid is at the correct level, and is pink and doesn’t smell burned. I recommend a transmission inspection after getting problem codes checked, performed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, and give you an accurate assessment of damage and cost estimate for repairs.

When changing the car battery, do you "register" the battery to the car computer?
ANSWER : Hi there. Changing the battery has nothing to do with programming a battery. If the car was flat dead with a battery that lost all of the power because the dome light was on, then when jumped the vehicle will run fine. What may need programmed when the battery is replaced is the key fob. The key fob will lose programming to the computer as the vehicle computer is reset. However, if a 9 volt battery saver was put into a cigarette lighter and the car battery was removed, then the computer will not lose its memory and be just fine. If you need further assistance with your battery, then seek out a professional, such as one from Your Mechanic, to help you.

Water was spilled in the trunk which soaked the car battery. Car won’t start now. Does water destroy a car battery?
ANSWER : Hi, thanks for writing in about the concern with the BMW 320i. If the battery was submerged in water then it’s completely possible for the battery to short out and die. Your friend will need to have the battery replaced. Also be sure to get all of the water out of the trunk. Have a certified technician, like one from YourMechanic, help you guys out if you need assistance with replacing the battery. Good luck.

Shifting from 2nd to 3rd, car stopped going fast. Now it won’t go at all.
ANSWER : It is possible that your clutch has failed. The sound you are hearing is likely due to the clutch not engaging with the engine due to it being worn. I would recommened having your transmission inspected by a qualified transmission expert to determine if your clutch requires replacement in order to resolve this issue. This inspection may require removal and partial disassembly of the transmission in order to verify that the clutch has failed.

My car will not start Intermittently. I purchased a new battery 2 weeks ago and yesterday the car wouldn’t start. Got a jump and
ANSWER : The issue you are having is probably due to an intermittent fault in the starter motor itself or a deficiency in the starter electrical circuit, for example a large voltage drop due to a poor ground or a high resistance connection. These issues can be readily diagnosed and resolved on a mobile basis if you request a hard starting diagnostic. If you request that diagnostic, the responding certified mechanic will get this resolved for you promptly. Based on Toyota’s Factory Service Manual, the battery should not be disconnected if the vehicle engine is running. The battery acts as a large resistive voltage sink and consequently taking the battery out of the circuit, while the alternator is still running, can create a voltage spike on the car’s electrical system which is not good for voltage sensitive components such as the engine computer. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

My car is in limp mode – 1997 Ford Taurus
ANSWER : If you cracked your oil filter and the engine pumped out all the oil and you continued to drive it, you may have damaged the internal bearing of the motor. If you perform an oil and filter change you may be able to start and run the engine, but the damage will have already of been done. Once you start the motor, if you hear engine noise then you will know the engine was damaged and will need major internal repairs or engine replacement. Have a mechanic like one from YourMechanic come and perform the oil and filter change and check for the internal engine damages.

Battery and oil light come on when trying to start car, take keys out try again car starts no problem and lights go away
ANSWER : Of course, don’t switch gears without being fully stopped, unless your Owner’s Manual or the manufacturer has alternative advice. However, the gear shift issue has no relation to the no-start problem you are describing. Inasmuch as you only have 6,000 miles on the car, the "constant on and off" that you believe has occurred is meaningless in comparison to the expected total vehicle service life. That is, assume what you perceive as "constant on and off", during merely 6,000 miles, might be equivalent to using the car "normally" for three years. A new car should be trouble free for at least 5 years, unless there is a defect, so your "constant on and off" is not a causal factor for any fault on the vehicle. What you might have is a defect in the ignition switch, or perhaps the immobilizer system, but if the problem is not in the switch itself, clearly there is an electrical problem.

If your vehicle is under warranty, by law the dealer MUST repair the issue you are describing within a prescribed time frame and number of "attempts", otherwise the dealer will run afoul of Federal and state Lemon Laws that give you very specific rights, and recourse (contact an Attorney; we are Mechanics, NOT attorneys). Consequently, if the vehicle is still under warranty, to save yourself money do be sure to seek a resolution from the dealer. If the vehicle is not under warranty, obviously a certified Mechanic from YourMechanic could identify the electrical fault and resolve this for you. If you want to go that route, please simply request a no start diagnostic -electrical system and the responding certified mechanic will get this taken care of for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.