All Lights Came on in Car While Driving: How To Fix It?

All lights came on in car while driving is an emergency issue that could easily make drivers panic. The most frequent causes are problems with your alternator, solenoid, or even your charging system.

All Lights Came on in Car While Driving

This article explains the main causes of all the dash lights coming on and how to resolve them, so read on!

What Are the Reasons Why All Dash Lights Come On While Driving?

The reasons why all your dash lights could come on while driving are battery issues, alternator issues, and loose wiring. Other reasons for the issue are a faulty wheel positioning sensor and ECU problems. Whatever the root issue is, you should work towards fixing it as soon as possible.

– Battery Related Problems

One of the most common causes of dash lights coming on while driving is battery problems. This usually occurs when the battery voltage drops lower than a particular level. The problem can cause your vehicle’s computer system to malfunction and also cause different systems to shut down in your car.

The malfunction will then trigger all the warning lights on your dashboard. If you notice all your dash lights coming on while driving, it is essential to check your battery status to ensure that it doesn’t have any issues. Ignoring the problem can cause more damage or potential safety hazards.

– Alternator Malfunctions

Alternator problems are another major cause of all the lights turning on while driving. The alternator charges your vehicle’s battery and powers the electrical system. Thus, if the alternator is faulty, it can cause the battery to drain.

Reasons of All Lights Came on in Car While Driving

Battery drainage reduces the voltage, which can cause all the dashboard warning lights to turn on. Alternator issues can also cause other electrical problems in your vehicle. These problems could range from dimming headlights to slow power windows, which could also make multiple lights appear on your dashboard.

Other alternator problems could also affect your vehicle’s cruise control and anti-lock brake, which would eventually trigger different warning signs like the brake warning light and the battery warning or battery alert light.

– Slack or Damaged Wiring

When your vehicle has any form of loose or damaged wiring, all the warning lights can turn on while driving. Since the wiring in your vehicle is responsible for transmitting electrical signals between various components, including the dashboard, it affects most or all the lights on your dashboard.


If you have a loose or damaged wire, for instance, it can disrupt the electrical signals, which could eventually lead to the dashboard lights coming on. Wiring problems can be challenging to diagnose, as the loose or damaged wire may be hidden behind the dashboard or any other part of the vehicle.

– Problems With the Steering Wheel Positioning Sensor

All your dashboard lights may also turn on while driving if you’re experiencing problems with your SWP sensor. The SWP sensor is very important for your vehicle’s safety system. It is responsible for transmitting essential signals to the computer. If your SWP sensor starts developing a fault, it may trigger other warnings.

– Engine Control Unit Issues

The engine control unit (ECU) can also be referred to as the engine control module. An ECU malfunction can easily trigger your dashboard warning lights. This module can be seen as your engine’s brain, as it gets information from the engine sensors and transmits the signals to enable the efficient running of your vehicle.

Car Engine Control Unit Issues

It can adjust things like how much air and fuel go into the engine and how the spark plugs work. If your ECU starts having problems, it can cause the computer system to receive incorrect or incomplete information. Sometimes, it fails to send any signals at all.

These issues could lead to the warning light on the dashboard coming on, including the check engine light. The ECU could malfunction for various reasons, including a faulty sensor or a software glitch, which could lead to an engine temperature warning.

– Problems With Your Electrical System

Sometimes, all your lights could come on because of an electrical problem. This can happen if there’s something wrong with the fuse box or if there’s a short circuit. The fuse box is responsible for giving power to your car’s electrical parts. A short circuit is when the electricity goes through the wrong path, which can also make the dash lights come on.

If your fuse box is not working correctly, it can cause problems like the dash lights coming on. Checking the fuse and relays is an easy way to identify a problem.

Electrical system problems can also make it difficult to read indicators like oil pressure lights, traction control lights, and other indicator lights. Electrical problems could also affect tire pressure monitoring. Some lights that could come up include the seat belt reminder warning, windshield washer fluid, engine oil, brake pad oil, and fuel indicator.

What Are Common Solutions to Dashboard Light on While Driving?

The common solutions to dashboard light on while driving include replacing the battery, changing your alternator, changing the auto control unit, and visiting an auto professional. It would be best to figure out the root issue and resolve it as soon as possible.

– Replace the Battery

If all your dash lights are coming on due to battery malfunction, changing the battery is the easiest way to fix the problem. Changing the battery is easy.

First, turn off the engine to avoid any electrical accidents. Once you’ve turned it off, locate the battery and disconnect the negative cable. To disconnect the cable, loosen any nut on the battery’s negative terminal with a wrench and remove the cable from the battery. Next, disconnect the positive cable using the same method as the negative cable.

Once you’ve disconnected both cables, remove the battery. Use a wrench to remove the bolts or clamps holding the battery in place, and carefully remove the battery from the car. After removing the battery, ensure that you clean it with battery cleaner to remove corrosion or dirt from the terminals.

Next, install the new battery and secure it with bolts or clamps. Once secure, reconnect the positive and negative cables by attaching them to their respective terminals. Tighten the nut with a wrench and test the new battery.

The cost of changing a car battery ranges from $50 to $400. The basic car battery can cost between $50 and $120, while a higher-performance battery can cost $200 dollars and higher. There are also labor costs if you’re not fixing the battery yourself.

– Change Your Alternator

If your lights are coming on as a result of alternator problems, you may have to change the alternator to fix the problem. Although this solution is a bit more complex than changing your battery, you can do it by following these simple steps.

Fixes of All Lights Came on in Car While Driving

First, you must turn off your engine and disconnect the battery to avoid electrical shocks. Next, locate the alternator in your engine and remove the belt from the alternator pulley, using a socket wrench to loosen the tensioner pulley. Next, remove the electrical connections from the alternator, including wires or other connectors.

After disconnecting the electrical connections, remove the bolt holding the alternator by using a socket wrench. Next, carefully remove the old alternator and install the new one.

Once you successfully replace the alternator, you reconnect the electrical connections by correctly replacing the positive and negative cables and any other wires or connectors. Next, reinstall the serpentine belt and tighten it to the alternator pulley. Finally, test your new alternator to make sure it’s working correctly.

– Change the Engine Control Unit

Once your ECU starts malfunctioning, it is advisable to change it immediately to avoid further complications or a damaged engine. You can replace the ECU using these simple steps. First, buy a new ECU to replace the old one. Always ensure you get one compatible with your vehicle’s model.

Next, disconnect the battery to avoid electrical shocks or any other hazards. Then, find the ECU and remove the old one. Before removing it, ensure that you disconnect all the wires and connectors from the old ECU.

You can now fix the new ECU by placing it in the location you removed. Then, reconnect all the wires and connectors. Once you’ve properly reconnected them, reconnect the battery and program the new ECU to be compatible with your vehicle settings and model.

It is advisable to let a professional change your ECU if you don’t have prior experience. The steps outlined above may be too technical for a beginner.

– Visit an Auto Repair Professional

While fixing most of these problems is easy and can be performed by anyone, you should visit a professional if you find any of the processes difficult or if all your lights are still on display but you cannot identify the root cause.

You should also visit a professional to help identify and fix the problem. Although it will incur additional costs, visiting a professional is the best choice for people who know only a little about car maintenance.

All Lights Came on in Car While Driving Details

Can the Same Fixes for AC Issues also Fix the All Lights Coming on in a Car Issue?

Are you wondering if the same fixes that address AC issues can also resolve the problem of all lights coming on in a car? While the keyword “ac blows cold passenger side fix” may not directly relate to all lights coming on, it’s worth checking if a faulty AC component is causing electrical disruptions. However, it is recommended to consult a professional mechanic to accurately diagnose and fix this issue.


There are several reasons why all the lights on your dashboard come on while driving, such as bad battery and alternator problems.

Here’s a summary of the key points discussed in this article:

  • All your dash lights coming on while driving indicates one or more problems that are affecting signal transmission to your vehicle’s computer system.
  • If all the lights on your dashboard suddenly come up, you should carefully inspect your car to find the underlying issue. These lights include oil and tire pressure warning lights and airbag warning lights.
  • After discovering the cause of the lights coming up, you must replace the bad part. This will fix the issues of check engine lights or other lights coming up.
  • While anyone can do some fixes, you may need to visit the professionals if you’re dealing with more advanced or technical issues.

With the information in this article, you can identify the cause of the blinking on your vehicle’s dashboard. Once you identify the problem, you should be able to fix it immediately without complications.

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