Freightliner Warning Lights and Meanings (FULL List, FREE Download)

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).

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.

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.

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

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

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.

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

Indicates the alternator is not properly powering the electrical system.

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

Indicates the fuel filter is clogged and requires service.

Indicates optimized idle is enabled.

Indicates an undesirable transmission condition.

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.

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.

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.

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.

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.

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

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.

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

Indicates the Active Brake Assist system is not available.

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.

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

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

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