WenmarOpen by Wenmar Pro

Service bulletin LI4263ER1

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 id10130022
Published by NHTSA2018-03-12
Manufacturer's numberLI4263ER1
Manufacturer's date2018-02-21
NHTSA componentFUEL SYSTEM, DIESEL; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM; ENGINE

NHTSA's summary

Subject to application and duty cycle, DEF dosing valve can clog up and cause engine to derate, stall, lose power and log FC3568. Increasing dosing valve and DEF hose angle can help reduce such occurrence. Vehicles reporting repetitive FC3568 can be modified according to procedure herein.

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

Engine, Exhaust and emissions, Fuel system

Vehicles listed
NOVA BUS LFS2013 to 2014
NOVA BUS LFS2015, 2016, 2017
NOVA BUS LFS ARTIC2013 to 2014
NOVA BUS LFS ARTIC2015, 2016, 2017 (the catalog's model; the bulletin names a series or trim of it)

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

Recalls for the same vehicles and component
20212862021-05-14. Fuel System
21V3510002021-05-14. FUEL SYSTEM, DIESEL:FUEL INJECTION SYSTEM:FUEL RAIL
20191712019-04-05. Engine
20172642017-05-16. Engine
20155252015-11-05. 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
LI5427E2023-12-22. Service bulletin. Improved durability of engine-side heat exchanger hoses.
BS5467E2023-10-17. Service bulletin. Potential presence of a gap may cause frame crack. Only to perform during a frame crack repair process near front bolt of joint #2.
FT46512023-08-17. Service bulletin. Failure of DEF sensor GEN 6 within the expected 5-years lifespan.
LI5228ER22023-04-27. Service bulletin. DEF GEN4 tank, tank head and sensor will no longer be available in service
FT52422023-02-25. Service bulletin. ECP radiator failures deemed to be due to overpressure events.
FT52432023-02-25. Service bulletin. ECP radiator failures deemed to be due to overpressure events.
APS5370E2023-02-24. Service bulletin. The Delco-Remy alternator is obsolete. Air cooled ductless (Almott) alternator, power cable and hardware kit to replace the Delco-Remy oil-cooled alternator.
LI5228ER12022-06-30. Service bulletin. DEF tank Head Unit GEN4
LI5228E2022-05-05. Service bulletin. DEF tank Head Unit GEN4 N8900882 is no longer available in service, it is replace by the new DEF tank Head Unit GEN5 N8910051
PC1025R32022-02-04. Service bulletin. radiator leaking coolant