Freightliner Warning Lights and Meanings

Confused by warning lights flashing on your Freightliner’s dashboard? Not sure what these symbols are trying to tell you? Don’t worry; we’ve got your back.

In this guide, we’ll provide you with a concise list of Freightliner dashboard warning lights and their explanations.

Let’s get started!

Freightliner Warning Lights and Meanings

Click the symbols for details if you want.

STOP Engine

(3 views)

Indicates a serious fault that requires engine shutdown immediately. The engine protection system will reduce the maximum engine torque and speed, and, if the condition does not improve, will shut down the engine within 30 to 60 seconds.
Safely bring the vehicle to a stop on the side of the road and shut down the engine as soon as the red light is seen.
If the engine shuts down while the vehicle is in a hazardous location, turn the key to the OFF position for a few seconds, then restart the engine and move the vehicle to a safer location.

High Coolant Temperature

(1 view)

Indicates the coolant temperature is above the maximum allowable temperature.

Low Air Pressure

(1 view)

Indicates air pressure in the primary or secondary reservoir has dropped below approximately 70 psi (483 kPa).

Steerable Tag Axle Warning

(0 view)

The steerable tag axle indicator activates when there is a loss of air pressure at the axle. Air pressure is needed to lock and unlock the steerable tag axle.

Low Air Pressure

(0 view)

Indicates air pressure in the primary or secondary reservoir has dropped below approximately 70 psi (483 kPa).

Low Engine Oil Pressure

(0 view)

Indicates the engine oil pressure is below the minimum allowable pressure.

Transmission Overheat

(0 view)

Indicates high transmission temperature.

Transmission Fluid Level

(0 view)

Indicates low transmission fluid level.
Safely bring the vehicle to a stop as soon as possible.

Parking Brake

(0 view)

Indicates the parking brake is engaged, or hydraulic brake fluid pressure is low.
An audible alert activates when the vehicle is moving over 2 mph (3 km/h) with the parking brake set.

Parking Brake

(0 view)

Indicates the parking brake is engaged.

Low Battery Voltage

(0 view)

Indicates that battery voltage is 11.9 volts or less.

Unfastened Seat Belt

(0 view)

Activates with an audible alert when the system detects that the parking brake is off and the driver seat belt is not fastened on some vehicles.
On other vehicles, this lamp illuminates for 15 seconds when the ignition is first turned on.

Check ECAS

(0 view)

Indicates Electronically Controlled Air Suspension (ECAS) active fault.

Malfunction Indicator Lamp

(2 views)

Indicates an emissions-related fault. See the engine operation manual for details.

Wheel Spin

(1 view)

Flashing indicates the ATC system is active, or the ATC button has been pressed to allow wheel slip.
Solid illumination indicates ATC is shut off or unavailable due to a system fault. In the event of a system fault, repair the ATC system immediately to ensure full braking capability.

High Exhaust System Temperature

(1 view)

Slow (10-second) flashing indicates a regeneration (regen) is in progress.
IMPORTANT: When the HEST lamp is illuminated, do not park the vehicle near flammable material.
Solid illumination indicates high exhaust temperatures at the outlet of the tail pipe when speed is below 5 mph (8 km/h).

CHECK Engine

(1 view)

Indicates an engine condition (low oil pressure, low coolant level, high coolant temperature, high DPF soot level, or uncontrolled DPF regeneration) that requires correction.
Correct the condition as soon as possible.
If the condition worsens, the STOP engine lamp will illuminate.

Stability Event

(0 view)

Flashing indicates a stability event has been detected, and the ESC system is active.
Solid illumination indicates a problem with the stability system. Repair the ESC system immediately to ensure full stability capability.

ATC Deactivated

(0 view)

Flashing indicates the ATC SPIN button has been pressed to allow wheel slip.
Solid illumination indicates ATC is shut off or unavailable due to a system fault. In the event of a system fault, repair the ATC system immediately to ensure full braking capability.

Roll Stability

(0 view)

Momentary illumination indicates that a stability event has occurred.
On vehicles that are also equipped with ATC, flashing indicates the ATC button has been pressed to allow wheel slip.
Solid illumination indicates ATC is shut off or unavailable due to a system fault. In the event of a system fault, repair the ATC system immediately to ensure full braking capability.

Hill Start Aid Override

(0 view)

Indicates the HSA switch has been pressed to override the hill start assist feature.

Outside Normal Ride Height

(0 view)

Indicates the current rear suspension height is not at the normal ride height. This light will turn off once the vehicle returns to normal ride height.

Bulb Out

(0 view)

Indicates that a bulb is not functioning in the headlights, tail lights, parking lights, or marker lights.

Active Brake Assist

(0 view)

Indicates the Active Brake Assist system is not available.

Lane Departure Warning

(0 view)

Indicates that lane departure warning is disabled due to minimum speed, no lane markings, or system not available.
NOTE: Only on vehicles equipped with Detroit Assurance radar.

Electronic Stability Control Indicator

(0 view)

The electronic stability control (ESC) indicator illuminates when the ESC system activates.

Forward Collision System Indicator

(0 view)

The forward collision system indicator illuminates only when the system is not available.

Transmission Overheat Warning

(0 view)

The transmission overheat indicator illuminates when the temperature of the transmission fluid goes above the preset level set by the transmission manufacturer.

Start Blocked

(0 view)

Indicates that the system is preventing the starter from cranking. This can occur when the ignition switch is turned to START before the gauge sweep has completed, or if the starter has overheated.
NOTE: Illumination of the Start Blocked lamp does not indicate a problem with the starter.
Turn the ignition switch back to ON, wait for the lamp to go out, then turn the ignition switch to START again.

Diesel Particulate Filter Status

(0 view)

Solid illumination indicates a regen is required. Change to a more challenging duty cycle (such as highway driving ) to raise exhaust temperatures for at least twenty minutes, or perform a parked regen.
Blinking indicates that a parked regen is required immediately. An engine derate and shutdown will occur

Vehicle ABS

(0 view)

Momentary illumination indicates the vehicle ABS is engaged.
Solid illumination indicates a problem with the vehicle ABS. Repair the ABS immediately to ensure full braking capability.

Trailer ABS

(0 view)

Momentary illumination indicates the trailer ABS is engaged.
Solid illumination indicates a problem with the trailer ABS. Repair the ABS immediately to ensure full braking capability

No Charge

(0 view)

Indicates the alternator is not properly powering the electrical system.

Water in Fuel

(0 view)

Indicates the fuel may contain water. Drain any water collected in the fuel/water separators.

Fuel Filter Restriction

(0 view)

Indicates the fuel filter is clogged and requires service.

Optimized Idle

(0 view)

Indicates optimized idle is enabled.

Check Transmission

(0 view)

Indicates an undesirable transmission condition.

Wait To Start

(0 view)

Indicates that the system is preventing the starter from cranking. This can occur when the ignition switch is turned to START before the gauge sweep has completed, or if the starter has overheated.
Turn the ignition switch back to ON, wait for the lamp to go out, then turn the ignition switch to START again.

Engine Brake

(3 views)

Indicates the engine brake is enabled.

Right Turn Signal

(0 view)

Flashing indicates the outside right-turn signal lights are activated.

Service Transmission Indicator

(0 view)

The service transmission indicator activates when the transmission requires service. For example the transmission oil or filter may need to be changed.
When the service transmission indicator illuminates, refer to the Allison Operator’s Manual or contact customer support at Allison Transmission to determine the specific cause activating the indicator.

Economy Mode Indicator

(0 view)

The economy mode indicator displays an E when the driver changes the transmission mode to economy.

Cruise Control

(0 view)

Indicates the cruise control is enabled.

Left Turn Signal

(0 view)

Flashing indicates the outside left-turn signal lights are activated.

High Beam Headlights Indicator

(0 view)

Indicates the high-beam headlights are on.

Now that you’ve understood your car’s signals better and have a clearer idea about how to respond to Freightliner dashboard lights, there’s still one thing to tackle: remembering the names and meanings of each symbol, which can be a bit tough, right?

Don’t worry!

I’ve collected a complete list of Freightliner warning lights and indicators, along with their meanings. You can easily find this list in both an image and a downloadable PDF E-book.

Feel free to take advantage of these resources for future use – your dashboard’s mysteries will be right there when you need them!

What’s Next?

Understanding your vehicle’s warning lights is essential for safe driving. When you’re puzzled by a dashboard symbol, refer to the Dash Lights Lookup tool.

And if you want to be in control of diagnosing car issues independently, consider investing in an OBD2 scanner; it’s a wise choice.

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Freightliner Warning Lights and Meanings

STOP Engine

High Coolant Temperature

Low Air Pressure

Steerable Tag Axle Warning

Low Air Pressure

Low Engine Oil Pressure

Transmission Overheat

Transmission Fluid Level

Parking Brake

Parking Brake

Low Battery Voltage

Unfastened Seat Belt

Check ECAS

Malfunction Indicator Lamp

Wheel Spin

High Exhaust System Temperature

CHECK Engine

Stability Event

ATC Deactivated

Roll Stability

Hill Start Aid Override

Outside Normal Ride Height

Bulb Out

Active Brake Assist

Lane Departure Warning

Electronic Stability Control Indicator

Forward Collision System Indicator

Transmission Overheat Warning

Start Blocked

Diesel Particulate Filter Status

Vehicle ABS

Trailer ABS

No Charge

Water in Fuel

Fuel Filter Restriction

Optimized Idle

Check Transmission

Wait To Start

Engine Brake

Right Turn Signal

Service Transmission Indicator

Economy Mode Indicator

Cruise Control

Left Turn Signal

High Beam Headlights Indicator

What’s Next?

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