Technical Service Bulletins
Search 172,063 manufacturer communications covering 879 vehicle makes from 1955 to 2025.
Showing 440 bulletins for KENWORTH
43-063
Dec 19, 2019
060000 ENGINE AND ENGINE COOLING
Emissions Campaign ??A?A? The Engine Overspeed lamp may illuminate during a smoke opacity test. A software update is available to resolve the issue.
03-071
Dec 18, 2019
118000 ELECTRICAL SYSTEM:SOFTWARE
Information Only - Vehicles built with NAMUX software from 2013 to present may experience accuracy issues with the tachometer. The issue can be temporarily resolved using any one of the included procedures.
99-040
Dec 12, 2019
118000 ELECTRICAL SYSTEM:SOFTWARE
Information Only ??A?A? This bulletin provides guidance when using DealerNet and determining the appropriate Diagnostic tool to use and information.
22-016
Dec 10, 2019
100000 POWER TRAIN
This bulletin has been obsoleted and replaced by Safety Recall 19KWE.
52-002
Dec 3, 2019
350000 EQUIPMENT
Fix-As-Fail - DEA5XX radio may be locked in the ON position or stuck in hi volume. A software update is available to resolve this issue.
E240
Nov 27, 2019
180000 VEHICLE SPEED CONTROL
Fix As Fail-Shudder sensation near the governed vehicle speed when using cruise control due to excessive control messaging from VECU. A VECU software update is available to correct the condition.
01-071
Nov 21, 2019
060000 ENGINE AND ENGINE COOLING
Fix as Fail: Certain Models 579 and 567 vehicles manufactured with a Cummins ISX-15 engine built before 11/05/2018 the evaporator core may crack. An improved suction line has been released to alleviate the stress that may cause a cracked e
01-075
Nov 6, 2019
060000 ENGINE AND ENGINE COOLING
Information Only: This bulletin provides guidance for repairing an air-conditioning system after internal failure of the A/C compressor.
TIB43-062
Sep 27, 2019
063000 ENGINE AND ENGINE COOLING:EXHAUST SYSTEM
Information Only ??A?A? This bulletin provides information about the California Air Resources Board (CARB) Periodic Smoke Inspection Program (PSIP) and Heavy Duty Vehicle Inspection Program (HDVIP).
TIB13-050
Sep 27, 2019
030000 SERVICE BRAKES, HYDRAULIC
Information Only T170, T270, and T370 with hydraulic ABS brakes require a programming harness. The harness is now a required or recommended tool.
44-030
Aug 30, 2019
080000 FUEL SYSTEM, DIESEL
Fix-As-Fail - Nylon fuel lines may be too short, potentially resulting in a cracked or loose, low pressure fuel fitting at the engine or fuel tank, which may introduce air into the fuel system resulting in a hard-to-start or no-start condit
01-074
Aug 30, 2019
130000 VISIBILITY
Fix-As-Fail -??A? C500, T440/T470, T800, W900 chassis HVAC Controllers may become unresponsive after rotating the temperature control knob quickly. HVAC Controllers with improved firmware are available to resolve this issue.
42-056
Aug 28, 2019
060000 ENGINE AND ENGINE COOLING
Fix-As-Fail -??A? Composite fittings used in the cooling system may crack, resulting in coolant leaks. Brass fittings are available to replace the composite fittings.
42-058
Aug 23, 2019
060000 ENGINE AND ENGINE COOLING
Fix-As-Fail: Two separate causes have been identified as root cause of intermittent low coolant indicator illumination.
01-073
Aug 2, 2019
350000 EQUIPMENT
Fix as Fail HVAC system may demonstrate inadequate temperature control, be stuck in defrost mode, or have intermittent changes in fan speed that can be remedied with an updated HVAC software.
23-003
Jul 22, 2019
100000 POWER TRAIN
Fix as Fail: Vehicles with Eaton Ultrashift Plus or Fuller Advantage Automated transmissions may display fault codes and/or have clutch release problems due to broken clutch levers. Resolution is to replace the clutch.
03-070
Jun 10, 2019
117000 ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
Fix as Fail: Vehicles built 11/30/15 to 7/18/16 may display an error message in the Service Advised display after updating CECU software.
34-071
Jun 10, 2019
060000 ENGINE (PWS)
Non-Safety Campaign: Vehicles ordered with parameter for brake lights disabled when engine brake applied were built with this feature enabled.
59-002
Jun 10, 2019
170000 LATCHES/LOCKS/LINKAGES
Non Safety Campaign: Holland Series FW17 fifth wheel handles may remain in an unlocked position when coupling to a parked trailer.
34-079
May 21, 2019
100000 POWER TRAIN
Fix-As-Fail ? Intermittent throttle hesitation may be encountered after installing an optional PTO connector.
43-060
May 3, 2019
350000 EQUIPMENT
Non-Safety Campaign - Certain chassis equipped with certain Goodyear tires received a Greenhouse Gas (GHG) label that does not reference the correct tire emissions identifier related to new rolling resistance data.
99-035
Apr 10, 2019
060000 ENGINE (PWS)
Information Only: Notification that DAVIE4 can be used to program Model 210 and Model 220 Vehicles.
34-077
Apr 8, 2019
353000 EQUIPMENT:ELECTRICAL
Information Only: Proper instructions for closure of power distribution box cover to prevent corrosion.
34-064
Jan 24, 2019
110000 ELECTRICAL SYSTEM
Non-Safety Campaign: Vehicles may have a fuse installed in the PDC (Power Distribution Center) in a location unable to support the amperage.