2011 Kenworth T800 TSBs

Eaton ultrashift plus excessive engine over-speed lamp on.

FIX-AS-FAIL - ENGINE OVER-SPEED LAMP COULD COME ON AFTER A DOWNSHIFT WITH THE EATON ULTRASHIFT PLUS TRANSMISSION.

MX RC5-RC14 SOFTWARE UPDATE CAMPAIGN.

KENWORTH: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER.

KENWORTH: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER.

KENWORTH: OIL COLLECTION AT CAC INTAKE PIPE IS CAUSED BY AN IMBALANCE IN TURBOCHARGER PRESSURES.

KENWORTH: DUE TO LOSS OF POWER AND HIGH FAILURE RATE, THE VALVES WILL BE REPLACED IN THE ENGINE FUEL CONTROL.

KENWORTH (PACCAR): ENGINE SOFTWARE UPDATE REQUIRED FOR INSTALLATION OF HC DOSER SHIELDS AND/OR EGR CLEANING FOR CHASSIS.

KENWORTH: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER.

KENWORTH: ENGINE CONTROL UNIT (ECU), IDENTIFIED AS PMCI IN ENGINE RAPIDO, SHOULD HAVE A PROTECTIVE SHIELD FOR SOFTWARE...

KENWORTH: INFORMATION FOR AFTERTREATMENT, PMCI OR RELATED ISSUES, CAUSED BY CORROSION FOR WATER IN FUEL (WIF) SENSOR,...

KENWORTH: FOR CERTAIN TRUCKS, THE ENGINE CONTROL UNIT (ECU), IDENTIFIED AS PMCI IN ENGINE RAPIDO, AND AFTERTREATMENT...

KENWORTH: POWER STEERING PUMP SPOOL VALVE DOES NOT MEET QUALITY STANDARDS.

PACCAR: VEHICLES WERE BUILT WITH MISSING REAR AXLE CAMSHAFT BRACES.

PACCAR SERVICE CAMPAIGN: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER.

PACCAR: ENGINEERING STANDARDS HAVE CHANGED AND THERE ARE NOW ENGINES WITH HEAT TREATED BOLTS.

PACCAR: A SOFTWARE UPDATE IS CAUSING THE CHECK ENGINE LIGHT TO COME ON.

PACCAR: A COOLANT SIEVE MUST BE REMOVED AT THE FIRST ENGINE OIL CHANGE.

"Kenworth: Dealers should check the chassis list and SIR weekly for VIN changes.

KENWORTH: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER.

KENWORTH: THE STANDARD PRODUCTION COMPONENTS ARE REPLACING THE PRE-PRODUCTION COMPONENTS.

KENWORTH: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER.

PACCAR: THERE MAY BE FALSE TORQUE READINGS AND A POTENTIAL FOR LOOSENING AND/OR LEAKS OF THE DOSER SUPPLY LINE SWIVEL NUT.

PACCAR: SHACKLE LINKS MAY HAVE BEEN MANUFACTURED INCORRECTLY AND HAVE PREMATURE CRACKING AND/OR A POSSIBLE BROKEN SHACKLE LINK.

PACCAR INC: FIRE TRUCK SEAT HEIGHT SPECIFICATION CHANGE.

PACCAR: THE CHASSIS NEED PRE-PRODUCTION PARTS REMOVED AND RETROFITTED WITH PRODUCTION PARTS.

PACCAR: THE CHASSIS NEED PRE-PRODUCTION PARTS REMOVED AND RETROFITTED WITH PRODUCTION PARTS.

Information Only: This bulletin provides dealers with a battery warranty quick reference guide to ensure the...

Information Only Vehicles may have the connector seals on the wheel speed sensor incorrectly installed, which may lead...

Information Only: Proper jump-starting voltage will eliminate high voltage related issues and equipment damage.

KENWORTH: DIAGNOSTICS INDICATE FAILED FUEL LEVEL SENSOR FUNCTION IN REPAIRS AND BEFORE COMPONENT IS REPLACED, DIAL...

KENWORTH: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER.

KENWORTH: INFORMATION REGARDING REAR NOX SENSOR REPAIRS SHOULD INCLUDE SYSTEM UPDATES FOR CHASSIS OPERATING IN...

PACCAR: WATER MAY SEEP BETWEEN THE WIRE INSULATION AND POTTING OF THE FUEL SENSOR.

PACCAR: THERE ARE COOLING MODULES THAT MAY HAVE A LOOSE CONNECTION AT THE CHARGE AIR COOLER MOUNTING.

PACCAR: THE FUEL SENSORS MIGHT NOT HAVE A SEALANT PLUG WHICH COULD LEAD TO WATER INTRUSION, CORROSSION, AND FALSE READINGS.

Update to existing Bulletin

Information Only - Vehicles built with NAMUX software from 2013 to present may experience accuracy issues with the tachometer.

PACCAR: SOFTWARE UPDATE INFORMATION.

KENWORTH: SOME TRUCKS FAILED TO MEET COMPANY STANDARDS FOR AIR VOLUME LIFT AXLE AND THE COMPANY WILL INCREASE AIR...

PACCAR: THE SECONDARY FOG LAMPS WILL NOT RESPOND TO THE IN CAB SWITCH.

PACCAR: THE CHASSIS NEEDS TO HAVE PRODUCTION PARTS INSTALLED AND PRE-PRODUCTION PARTS REMOVED.

KENWORTH: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER.

KENWORTH: ON CERTAIN TRUCKS, THE EATON TRANSMISSIONS MAY BE SUSCEPTIBLE TO HAVING WATER INTRUSION WHICH CAN CAUSE THE ECU TO STOP WORKING.

PACCAR: INFORMATION ON PREMATURE FAN CLUTCH LINING WEAR.

Information Only Windshield washer pumps have a high No Trouble Found rate.

KENWORTH: PROCEDURAL INFORMATION PROVIDED REGARDING THE REPLACEMENT OF HOOD WHERE THERE ARE DAMAGED HOOD POCKETS.

KENWORTH: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER.

PACCAR SERVICE CAMPAIGN: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER.

Certain C500/T440/T470/T660/T680/T800/T880/W900 chassis may have air tank reservoirs that do not meet air volume...

Information Only: This bulletin provides guidance for repairing an air-conditioning system after internal failure of the...

Information Only This bulletin provides information about the California Air Resources Board (CARB) Periodic Smoke...

PACCAR: INFORMATION ON FAN HUB BEARINGS INSPECTION AND WARRANTY EXTENSION DUE TO A HIGHER THAN NORMAL FAILURE RATE.