# Service bulletin SB54\-334

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: 10198593
- Published by NHTSA: 2021\-06\-29
- Manufacturer's number: SB54\-334
- Manufacturer's date: 2021\-06\-01
- NHTSA component: FORWARD COLLISION AVOIDANCE; ENGINE AND ENGINE COOLING

## NHTSA's summary

Freightliner Service Bulletin for Detroit Assurance 4.0 Software v20.05. New Cascadia trucks built from January 1, 2017 through September 9, 2019 and equipped with Detroit Assurance correctly initiate an active brake assist \(ABA\) event when a vehicle or obstacle is detected in front of the truck. Some of those trucks may continue decelerating to a complete stop, even after the vehicle or obstacle detected in front of the Detroit Assurance\-equipped truck has moved away.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10198593-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10198593-9999.pdf)

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

## Components

Driver assistance, Engine

## Vehicles listed

- 2017 to 2020 FREIGHTLINER CASCADIA

## Recalls for the same vehicles and component

- [26V583000](/recalls/nhtsa/26V583000.md), 2026-09-09: ELECTRONIC STABILITY CONTROL \(ESC\); SERVICE BRAKES, AIR:ANTILOCK
- [23V299000](/recalls/nhtsa/23V299000.md), 2023-04-26: ELECTRONIC STABILITY CONTROL \(ESC\)
- [23V073000](/recalls/nhtsa/23V073000.md), 2023-02-10: ELECTRONIC STABILITY CONTROL \(ESC\); SERVICE BRAKES, AIR:ANTILOCK:MODULATOR
- [22V817000](/recalls/nhtsa/22V817000.md), 2022-11-01: SERVICE BRAKES, AIR:ANTILOCK:MODULATOR; FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL
- [18V581000](/recalls/nhtsa/18V581000.md), 2018-08-30: ENGINE AND ENGINE COOLING:ENGINE:DIESEL
- [16V416000](/recalls/nhtsa/16V416000.md), 2016-06-09: ENGINE AND ENGINE COOLING:ENGINE:DIESEL
- [2016285](/recalls/tc/2016285.md), 2016-06-06: Engine

## Other bulletins for the same vehicles and component

- [TEM\-11\-00001](/bulletins/11035536.md), 2026-08-03, Other: FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL; FORWARD COLLISION AVOIDANCE: WARNINGS. Truck Equipment Manufacturer upfit guide for Detroit Assurance Forward Radar Relocation and Adjustment
- [CXA 04\_26\_Side Guard](/bulletins/11031981.md), 2026-05-02, Other: LANE DEPARTURE: BLIND SPOT DETECTION. CX Advocate for P4 Side Guard Assist On/Off Menus and Trailer Functionality \(TSB\-54\-381\-FTL\)
- [FleetCom\_Heater Core](/bulletins/11027493.md), 2026-01-08, Other: ENGINE. Fleet Communications for Heater Core Plugging
- [FleetCom\_SS 3163\-FTL](/bulletins/11026453.md), 2025-12-06, Other: ENGINE. Fleet Communications for Power Steering Reservoir Fill Cap Venting
- [FleetCom\_Low Coolant](/bulletins/11026421.md), 2025-12-05, Other: ENGINE. Fleet Communications for Low Coolant Sensor
- [FAB344](/bulletins/11024978.md), 2025-11-05, Other: FORWARD COLLISION AVOIDANCE: WARNINGS; LANE DEPARTURE: ASSIST; LANE DEPARTURE: WARNING. Features and Benefits for SafetyDirect 5.1
- [CXA\_10\_25\_Low Coolant](/bulletins/11024962.md), 2025-11-05, Other: ENGINE. CX Advocate for P4, WST X\-Series, DD Engines Low/Critical Low Coolant Warnings
- [CXA\_10\_25\_Conmet Oil Pan](/bulletins/11024958.md), 2025-11-05, Other: ENGINE. CX Advocate for ConMet Oil Pan Insert Additional Issues
- [CXA\_8\_25\_KY AEB](/bulletins/11022338.md), 2025-09-02, Other: FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING. CX Advocate for KY AEB Notice
- [KY AEB Notice](/bulletins/11022314.md), 2025-09-02, Other: FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING. Customer letter for Detroit Assurance Kentucky Interstate 71 Road Hazard

JSON: [/v1/bulletins/10198593](/v1/bulletins/10198593)

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