2011 Kenworth T400

Service bulletins

Technical service bulletins and other communications the manufacturer sent dealers about this vehicle. Ask a dealer for the full document by its number.

• 10254164Certain 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.
• 10188550Information Only Windshield washer pumps have a high No Trouble Found rate. Washer pumps may fail to spray due to a clogged filter.
• 10177021Information Only: This bulletin provides dealers with a battery warranty quick reference guide to ensure the appropriate tests for battery warranty are performed in order to prevent battery warranty claims filed with incorrect or incomplete information.
• 10173212Information Only Vehicles may have the connector seals on the wheel speed sensor incorrectly installed, which may lead to water intrusion and corrosion in some vehicles.
• 10173205Information Only: Proper jump-starting voltage will eliminate high voltage related issues and equipment damage.
• 10169787Information 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.
• 10168703Information Only: This bulletin provides guidance for repairing an air-conditioning system after internal failure of the A/C compressor.
• 10165583Information Only This bulletin provides information about the California Air Resources Board (CARB) Periodic Smoke Inspection Program (PSIP) and Heavy Duty Vehicle Inspection Program (HDVIP).
• 10045242Kenworth: diagnostics indicate failed fuel level sensor function in repairs and before component IS replaced, dial face should be cleaned and failure verified. All kenworth models with ohm dial or open card style fuel senders.
• 10044092Kenworth: see document search button for owner letter. On certain chassis, the transmission temperature fails to be on the navplus driver display and certain cautions and warnings appropriate for highways needs to be disabled for residential areas.
• 10043876Kenworth: the standard production components are replacing the pre-production components.
• 10042748Kenworth: see document search button for owner letter. The front axle u bolts were manufactured on certain T3 and T4 series trucks with insufficient torque.
• 10040167Paccar: information on premature fan clutch lining wear.
• 10040166Paccar: information on fan hub bearings inspection and warranty extension due to a higher than normal failure rate.
• 10040165Paccar: there are cooling modules that may have a loose connection at the charge air cooler mounting.
• 10040037Paccar: the fuel sensors might not have a sealant plug which could lead to water intrusion, corrossion, and false readings.
• 10039626Paccar: the chassis need pre-production parts removed and retrofitted with production parts.
• 10038191Paccar: the chassis needs to have production parts installed and pre-production parts removed.
• 10034708Kenworth service campaign: see document search button for owner letter. Door label (gawr, gvwr) replacement campaign. The gross axle and gross vehicle weight ratings (gawr and gvwr respectively) listed on the door certification label, may have not been rounded appropriately due to a conversion factor issue at one of the plants. Csc letter has been received.

Every Kenworth T400 model year

Bars are owner complaints, dots mark years with recalls. Select a year to open its report.