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Service bulletin 13-048

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10136233
Published by NHTSA2018-05-07
Manufacturer's number13-048
Manufacturer's date2018-03-06
NHTSA componentSERVICE BRAKES; ENGINE

NHTSA's summary

Fix-As-Fail ? Repair procedure for DTCs U1120 and/or U17C5 with WABCO Q27-6075-130 ABS ECU.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Brakes, Engine

Trouble codes named

U1120, U17C5

Vehicles listed
KENWORTH T6802017

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
24V1450002024-02-23. SERVICE BRAKES, AIR:SUPPLY:RESERVOIR/TANK
20204612020-09-29. Brakes
20V5930002020-09-28. SERVICE BRAKES, AIR:ANTILOCK
20V1990002020-04-06. SERVICE BRAKES, AIR:ANTILOCK:ABS WARNING LIGHT; ELECTRONIC STABILITY CONTROL (ESC)
18V6570002018-09-21. ENGINE AND ENGINE COOLING:ENGINE:DIESEL
18V3680002018-06-01. ELECTRONIC STABILITY CONTROL (ESC); SERVICE BRAKES, AIR:ANTILOCK:ABS WARNING LIGHT
20162892016-06-08. Engine

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
P0012026-09-29. Service bulletin. "Kenworth: Dealers should check the chassis list and SIR weekly for VIN changes. 2 chassis added to the chassis list. Peterbilt: Dealers should check the chassis list and SIR weekly for VIN changes. 10 chassis added to the chassis list."
E3432026-09-23. Service bulletin. An exhaust manifold slip joint seal kit is now available for EPA 2017-2024 PACCAR MX-13 engines.
E3112026-07-21. Service bulletin. The Condition, Chassis Affected, Service Action, Warranty, and Procedure sections have been updated to include the latest prognostics bulletin verbiage.
45-0702026-05-06. Service bulletin. The attached procedures document has been updated with more detail and explanations. This is not a stand-alone procedure. Cummins Quickserve troubleshooting will specify the use of these procedures while troubleshooting specific fault codes.
E3262026-05-06. Emissions. EPA17-24 MX Fuel Injector Connector - This bulletin has been revised to include all EPA17-24 and CARB24 PACCAR MX engines.
E3262026-04-07. Emissions. EPA17-24 MX-13 Fuel Injector Connector - This bulletin has been revised to include EPA24 PACCAR MX-13 engines.
45-0702026-02-05. Service bulletin. Procedure pictures updated for clarity. When troubleshooting Cummins X15 fault codes 555 or 556, follow this additional testing, inspection, and documentation procedure to help identify the root cause of dusted engines. This is not a stand-alone process but must be used alongside Cummins troubleshooting steps. Cummins Quickserve will reference this bulletin for fault codes 555 or 556.
24KWD2024-05-04. Service bulletin. Certain C500/T440/T470/T660/T680/T800/T880/W900 chassis may have air tank reservoirs that do not meet air volume requirements per FMVSS/CMVSS 121 “Air Brake Systems”. This bulletin will be updated when repair parts and procedures are available.
E3042023-11-10. Service bulletin. E304: PACCAR MX-11 and MX-13 EMY2016 NOx and N2O Exceedance Emissions Recall Certain vehicles with PACCAR MX-11 and MX-13 EMY2016 engines with less than 300,000 miles (482,803 km) have been shown, in testing, to exceed regulatory limits for NOx and N2O emissions. This bulletin now applies to both Canadian and U.S.-registered vehicles. Software is now available to remedy this emissions non-compliance. NOTE California-registered vehicles that received a letter must have the software updated AND California documentation completed regardless of vehicle mileage.
E2932023-07-05. Service bulletin. Emissions Recall Certain Vehicle Model Year 2017-2019 chassis equipped with EPA2017 compliant PACCAR MX-13 engines have an EGR flex pipe that can develop cracks and leak untreated exhaust. The EGR Flex pipe will be replaced if it has a suspect part number.