# Service bulletin SB54\-331

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10177693
- Published by NHTSA: 2020\-07\-31
- Manufacturer's number: SB54\-331
- Manufacturer's date: 2020\-07\-30
- NHTSA component: ELECTRICAL SYSTEM; EXTERIOR LIGHTING; VISIBILITY

## NHTSA's summary

Freightliner Service Bulletin for Updated ULB Control Unit for LED Headlamps. New Cascadia vehicles with light emitting diode \(LED\) headlamps built from January 1, 2017 through February 17, 2020 may experience intermittent disabled headlamps due to an issue with the universal light ballast \(ULB\). The LED headlamps can turn off if the supply voltage drops below approximately 9V. This low voltage commonly and momentarily occurs when cranking the engine on a vehicle with batteries that are not fully charged. The momentary low voltage may cause the electronic ULB control unit to malfunction. The ULB may not resume normal function until the power supply to the headlamp is disconnected.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10177693-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10177693-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Electrical system, Glass, wipers and mirrors, Lighting

## Vehicles listed

- 2018 to 2021 FREIGHTLINER CASCADIA

## Recalls for the same vehicles and component

- [2024745](/recalls/tc/2024745.md), 2024-12-10: Visual System
- [2023280](/recalls/tc/2023280.md), 2023-05-11: Lights And Instruments
- [23V208000](/recalls/nhtsa/23V208000.md), 2023-03-28: EXTERIOR LIGHTING:HAZARD FLASHING WARNING LIGHTS; EXTERIOR LIGHTING
- [20V567000](/recalls/nhtsa/20V567000.md), 2022-02-16: EXTERIOR LIGHTING:BRAKE LIGHTS
- [2021399](/recalls/tc/2021399.md), 2021-06-25: Electrical
- [21V481000](/recalls/nhtsa/21V481000.md), 2021-06-25: ELECTRICAL SYSTEM:12V/24V/48V BATTERY:CABLES
- [2021290](/recalls/tc/2021290.md), 2021-05-14: Lights And Instruments
- [21V357000](/recalls/nhtsa/21V357000.md), 2021-05-14: EXTERIOR LIGHTING:HEADLIGHTS:BULBS
- [2020158](/recalls/tc/2020158.md), 2020-04-14: Lights And Instruments
- [20V214000](/recalls/nhtsa/20V214000.md), 2020-04-14: EXTERIOR LIGHTING

## Other bulletins for the same vehicles and component

- [CXA 06\_26\_Utility Lamp](/bulletins/11034519.md), 2026-07-06, Other: EXTERIOR LIGHTING. CX Advocate for Utility Lamp water intrusion
- [FleetCom 1\_Solenoid](/bulletins/11031966.md), 2026-05-02, Other: ELECTRICAL SYSTEM. Fleet Communications for solenoid issues
- [FleetCom\_SS 3174\-FTL](/bulletins/11026469.md), 2025-12-06, Other: ELECTRICAL SYSTEM. Fleet Communication for SS 3174\-FTL
- [FleetCom\_AMP Draw](/bulletins/11026454.md), 2025-12-06, Other: ELECTRICAL SYSTEM. Fleet Communications for Key off amp draw
- [SS3076\-FTL](/bulletins/11024972.md), 2025-11-05, Other: VISIBILITY/WIPER. Service Solution for P4 Main Mirror Arm Covers Loose \- Falling Off
- [CXA\_10\_25\_Tech Questions](/bulletins/11024966.md), 2025-11-05, Other: ELECTRICAL SYSTEM; POWER TRAIN. CX Advocate for technical questions/issues raised
- [SS3176\-FTL](/bulletins/11017537.md), 2025-05-02, Other: ELECTRICAL SYSTEM. Service Solution for ICC5 Erroneous Electric Power Steering Warning Message
- [CXA 4\_25\_Elec Pwr Steer](/bulletins/11017529.md), 2025-05-02, Other: ELECTRICAL SYSTEM. CX Advocate for ICC5 erroneous electric power steering warning message \(SS3176\-FTL\)
- [SS3176\-FTL](/bulletins/11016335.md), 2025-04-02, Other: ELECTRICAL SYSTEM. Service Solution for ICC5 Erroneous Electric Power Steering Warning Message
- [SS3174\-FTL](/bulletins/11016315.md), 2025-04-02, Other: ELECTRICAL SYSTEM. Service Solution for ICC5 B\-Panel Gauges Intermittently Not Being Displayed

JSON: [/v1/bulletins/10177693](/v1/bulletins/10177693)

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