
Semi Truck Maintenance During Off-Seasons
February 19, 2026Your semi-truck dashboard alerts are some of the most essential support tools when you’re on the road. Paying close attention to these signs can help prevent truck breakdowns and ensure you have a smooth trip. They’re like windows into the heart of your big rig, acting as eyes on your engine and mechanics when you’re focused on the road.
Dash alerts signal drivers and maintenance workers to engine issues, fuel levels, tire pressure, brakes, and electrical systems, among many other things. High-end semi-trucks have alerts for the on-board alarm clock, HVAC system, and more. There are so many lights and functions on the dashboard that it can seem like you need a complete truck warning lights guide to get a handle on it all.
The experts at LubeZone Truck Lube Center are here with a comprehensive guide to provide insight into all things relating to semi-truck dashboard alerts. We’ll provide a high-level overview of common alerts, explain the difference between critical and minor warnings, and provide a step-by-step guide for what to do when you see an alert come on the dash. Additionally, we’ll give you easy semi-truck maintenance tips to keep your rig running smoothly.
Keep reading our semi-truck warning lights guide for more information, and stop at the nearest LubeZone Truck Lube Center along your next route for speedy preventative maintenance.
Understanding Semi-Truck Dashboard Alerts
Your semi-truck’s dashboard alert system plays a crucial role in preventing unexpected costly repairs. Additionally, it keeps you well-informed on the health of your truck, letting you know what it needs next. This ensures that all of your truck’s functions–from windshield wipers to the AC, brake lights to tire pressure, and far more, remain in top form at all times. The collection of lights and sensors provides real-time information about your truck’s performance and safety.
When you see a light come on the dash, it indicates a specific problem or item that needs attention. These include basic maintenance points as well as critical warnings. Semi-truck dashboard alerts provide information on things that could affect the operation of your vehicle. They ensure a timely response to potential issues that can lead to breakdowns, accidents, or costly repairs. Think of your warning lights as a mechanic-on-board of sorts, constantly checking on your truck’s performance and identifying any shortcomings.
Critical Alerts vs. Minor Dashboard Alerts
Some critical dashboard alerts require immediate attention to ensure your truck stays in operation. For instance, if the oil pressure warning, brake systems alert, or engine warning light comes on, you should always stop immediately. Others are more minor and give you a heads-up of things that need to be addressed later — like the windshield wiper fluid, air-bag warning, or amenity alerts. However, when viewed all together, your semi-truck dashboard alert system paints a comprehensive picture of all your big rig’s needs.
Common Dashboard Symbols and Their Meanings
Knowing which alerts require urgent action and which you can address at your next stop is important. Use the handy semi-truck warning lights guide below to decipher what may be happening with your vehicle. It’s essential to take note of all warning lights immediately and decide whether you need to pull over now or if you can make it to the next stop.
| Semi-Truck Dashboard Alert
| Critical | Non-Critical | What It Means
|
| Engine Warning Light | X | A problem with the engine: possible overheating, low oil pressure, or a malfunctioning component. | |
| Air Suspension Warning | X | Indicates the system is experiencing an issue, that will potentially affect ride height, handling, and stability. | |
| Engine Temperature | X | Potential engine overheating issue. | |
| Transmission Warning | X | Potential issues with the transmission system: low fluid, overheating, or internal problems. | |
| ABS Warning | X | Indicates a fault in the ABS, which helps prevent the wheels from locking up during hard braking. | |
| Def/AdBlue Warning | X | On trucks equipped with selective catalytic reduction (SCR) systems for emissions control, this alert indicates issues with the diesel exhaust fluid (DEF) or the SCR system. | |
| Traction Control Light | X | The truck’s traction control system is either engaged or experiencing a problem. | |
| Airbag Warning | X | Indicates a fault in the Supplemental Restraint System (SRS) and airbags may not deploy correctly in an accident. | |
| Coolant Temperature Warning | X | The engine coolant temperature is too high, meaning the engine is overheating. Possible coolant leak, bad thermostat, or a radiator problem. | |
| Fuel Warning | X | Indicates you need to re-fuel the truck imminently, or there’s an issue with the fuel system like a clogged filter. | |
| TMPS Light | X | Indicates you need to re-fuel the truck imminently, or there’s an issue with the fuel system like a clogged filter. | |
| Brake System Alert | X | Indicates trouble with your brake system: low brake fluid, bad brake pads, and more. | |
| Battery/Charging Warning | X | The battery may not be charging properly, or there’s an issue with the vehicle’s charging system (ex: bad alternator). | |
| Voltage Warning | X | Indicates a problem with vehicle charging, like low battery voltage or a failing alternator. | |
| Check Engine Light | X | Indicates a potential problem with the engine, emissions, or other related systems. Solid lights indicate less severe issues, while a blinking light signals immediate action is necessary. | |
| Oil Level Warning | X | Indicates that the engine oil level is dangerously low. Possible insufficient oil, a leak, a failing oil pump, or a clogged filter. | |
| Oil Pressure Warning | X | This means the oil is unable to make it to the engine, possibly due to a clogged filter, a leak in the oil line, or a worn-out pump. | |
| Amenity Alerts (Alarm Clock, Cabin HVAC, etc) | X | Indicates one of your onboard amenities needs attention. Items like your cabin HVAC system may require a new filter, you may need to replace specific batteries, check power sources, and more. |
Steps to Take When a Dashboard Alert Appears
Knowing how to respond to an alert is vital when you’re on the road. Meeting your trip deadlines, making your miles, and getting to your destination on time are all essential parts of the job. However, ignoring critical signs regarding your truck’s health can result in costly repairs, unexpected downtown, and lengthy stays at the mechanic. That means you don’t just lose time–you lose money, too.
For these reasons and more, performing an initial inspection before any trip is necessary. Additionally, inspect your vehicle at each stop and keep up with basic preventative maintenance to minimize the chance of issues. Preventative maintenance is always quicker and cheaper than waiting to address a problem once something goes wrong, and it can ward off many truck and engine issues from occurring in the first place.
If you notice a semi-truck dashboard alert while driving or before a trip begins, here are the steps to ensure it gets handled correctly.
- Step One:
Identify the Semi-Truck Warning Light.
Determine what the light means. You may need to look at the manufacturer’s manual or website for proper identification. - Step Two: Conduct an Initial Inspection.
Some semi-truck dashboard alerts are easily fixed. For example, if your TMPS light comes on, examine the tire in question right away. It may be as simple as high or low PSI, which you can easily adjust and keep moving. - Step Three: Do Some Basic Troubleshooting.
Other issues may not be as readily apparent but can be resolved with some quick troubleshooting. For example, a voltage warning light may signify a poor battery connection that you can resolve with a quick cleaning of the components. - Step Four: Make a Decision. Once you’ve assessed the situation and done some troubleshooting, it’s time to decide whether you need to pull over or if you can make it to the next stop. Some lights require even more urgent action, and you may need to stop on the shoulder and contact roadside service.
Preventative Maintenance to Avoid Dashboard Alerts
You can avoid triggering dashboard alerts with solid, regular semi-truck maintenance. Actions like checking fluid levels, monitoring tire pressure, and scheduling routine inspections are quick and easy, but they can prevent major issues and breakdowns from happening on the road.
Here are a few maintenance tips that can prevent truck breakdowns:
- Check your oil levels before and after each trip and at each stop.
- Replace oil filters regularly.
- Check coolant levels, brake fluid, and transmission fluid before each trip and at each stop.
- Check tire pressure and condition regularly.
- Inspect the battery system and charging terminals. This includes the alternator, belt, and battery testing to ensure it holds a charge.
- Check your brake pads, discs, and air brake system before each trip.
- Check your radiator and hoses and flush the system regularly.
- Inspect fuses and wiring and clean your sensors and connections.
- Use diagnostic tools to check the truck’s electronic systems regularly.
- Maintain your exterior lighting and ensure all lights are working regularly.
- Before starting every trip, do a comprehensive walk-around check to ensure the truck is in good working condition.
When to Seek Professional Help for Dashboard Alerts
Sometimes, it’s necessary to take the truck to a service center right away. When the check engine light flashes or multiple alerts appear, it can indicate a more serious issue with your vehicle’s health. While DIY fixes (like adjusting your tire pressure) can save the day sometimes, there are other instances where you need to contact a mechanic.
It’s time to seek professional truck maintenance when:
- You cannot identify the cause of a warning light.
- A warning light goes away but reappears after troubleshooting or a DIY fix.
- There’s a warning light that indicates a serious engine issue.
- You know that a part or system in your truck is broken or needs repair.
Visit LubeZone Truck Lube Center Today
LubeZone Truck Lube Center is home to a 40-minute quick lube service. We’ll get you out the door and back on the road in no time. Additionally, we offer a wide variety of preventative semi-truck maintenance services, like free tire checks at every stop, DOT inspections at select locations, and tire alignments.
Visit LubeZone today to keep your truck running at its very best.

LubeZone is the fastest growing dedicated semi-truck service in the United States with locations in Texas, California, Oklahoma, North Carolina and Georgia. Our preventative maintenance solutions are designed to get the professional driver back on the road FAST.


