Freightliner Warning Lights: Key Symbols

Freightliner trucks are equipped with a variety of dashboard warning lights and symbols to inform the driver about the vehicle’s condition and any issues that need attention.

Freightliner Warning Lights List

Here’s a summary of some key Freightliner warning lights and their meanings:

  • Parking Brake: Indicates the parking brake is engaged.
  • Low Battery Voltage: Signals battery voltage is 11.9 volts or less, indicating potential battery or electrical system issues.
  • Unfastened Seat Belt: Activates with an audible alert when the driver’s seat belt is not fastened, depending on the vehicle model.
  • Check ECAS (Electronically Controlled Air Suspension): Indicates an active fault in the air suspension system.
  • Steerable Tag Axle Warning: Alerts to a loss of air pressure at the axle, which is necessary for locking and unlocking the steerable tag axle.
  • High Exhaust System Temperature (HEST): Indicates a regeneration process is in progress or warns of high exhaust temperatures at low speeds.
  • Wheel Spin: Signifies the Automatic Traction Control (ATC) system is active or has been manually overridden.
  • Check Engine: Warns of an engine condition that needs attention, such as low oil pressure or high coolant temperature.
  • Diesel Particulate Filter Status: Alerts the need for a regeneration cycle to clear the DPF, either through driving conditions or a parked regen.
  • Malfunction Indicator Lamp (MIL): Indicates an emissions-related fault.
  • Vehicle ABS: Illumination suggests the ABS system is engaged or there’s a fault with the vehicle’s ABS.
  • Transmission Overheat Warning: Warns that the transmission fluid temperature is above the preset limit.
  • Engine Brake: Indicates the engine brake is enabled.

Additional symbols and their meanings include indicators for cruise control, Diesel Exhaust Fluid (DEF) quality, emergency buzzer activation conditions, high coolant temperature, and more. Some symbols are color-coded: red generally indicates critical warnings, amber signals caution or maintenance needs, and green shows operational statuses such as the jake brake being enabled.

Last Words

Understanding these symbols’ meanings is crucial for safe operation and truck maintenance. It’s also important to consult the vehicle’s owner’s manual or contact a Freightliner dealer for any unfamiliar symbols or for further assistance with warning lights.

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