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Service bulletins for the 2008 Kenworth T300

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.

20 on file from NHTSA, as of 2026-10-19.

By type

By component

Bulletins, newest first
42-0702026-10-17. Service bulletin. UNKNOWN OR OTHER. Due to supplier constraints, an authorized aftermarket surge tank has been made available.
P0012026-09-29. Service bulletin. ENGINE. "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."
02-1602021-03-10. Service bulletin. VISIBILITY; EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY; VISIBILITY:WINDSHIELD WIPER/WASHER. Information Only – Windshield washer pumps have a high No Trouble Found rate. Washer pumps may fail to spray due to a clogged filter.
32-0152020-07-03. Service bulletin. ELECTRICAL SYSTEM. Information 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.
34-0852020-04-03. Service bulletin. VEHICLE SPEED CONTROL; ELECTRICAL SYSTEM. Information 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.
32-0162020-04-03. Service bulletin. EQUIPMENT. Information Only: Proper jump-starting voltage will eliminate high voltage related issues and equipment damage.
01-0752019-12-04. Service bulletin. ENGINE AND ENGINE COOLING. Information Only: This bulletin provides guidance for repairing an air-conditioning system after internal failure of the A/C compressor.
TIB-34-0392011-09-02. Service bulletin. SUSPENSION:FRONT:SPRINGS:LEAF SPRING ASSEMBLY:U-BOLT, LEAF SPRING TO AXLE. PACCAR SERVICE CAMPAIGN: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER. INFORMATION ON THE FRONT DRIVE AXLE SPEED WARNING DISPLAY. *RM
TIB-42-482011-08-16. Service bulletin. ENGINE AND ENGINE COOLING:COOLING SYSTEM:FAN. PACCAR: INFORMATION ON PREMATURE FAN CLUTCH LINING WEAR. *RM
TIB-42-0432011-08-16. Service bulletin. ENGINE AND ENGINE COOLING:COOLING SYSTEM:FAN. PACCAR: INFORMATION ON FAN HUB BEARINGS INSPECTION AND WARRANTY EXTENSION DUE TO A HIGHER THAN NORMAL FAILURE RATE. *RM
TIB-41-0142011-08-16. Service bulletin. ENGINE AND ENGINE COOLING:COOLING SYSTEM:RADIATOR ASSEMBLY. PACCAR: THERE ARE COOLING MODULES THAT MAY HAVE A LOOSE CONNECTION AT THE CHARGE AIR COOLER MOUNTING. *RM
TIB-02-1132011-08-12. Service bulletin. SEATS. PACCAR INC: FIRE TRUCK SEAT HEIGHT SPECIFICATION CHANGE. *RM
TIB-34-342010-04-26. Service bulletin. EXTERIOR LIGHTING:HEADLIGHTS:CONCEALMENT DEVICES; EXTERIOR LIGHTING:HEADLIGHTS. KENWORTH TRUCKS: HEADLIGHT MOISTURE REPAIRS. BEADS OF MOISTURE OR POOLING WATER VISIBLE THROUGH THE HEADLIGHT LENSES. INSPECT FOR MISSING HEADLIGHT VENT AND/OR ROCK SHIELD AND REPAIR AS NECESSARY. *PE
TIB-45-362009-09-29. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:DIESEL. KENWORTH SERVICE CAMPAIGN: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER. THIS IS A FIELD CAMPAIGN TO MODIFY THE TURBOCHARGER OIL DRAIN PLUMBING. MODEL T300, MY 12/13/06-07/09/08. CSC LETTER REC'D. *PE
TIB-45-352009-03-26. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:DIESEL. KENWORTH TRUCKS: PX-8 AND CUMMINS ISL ENGINE CALIBRATION CAMPAIGN C0844. UPGRADE ENGINE CONTROL SOFTWARE FOR PACCAR PX 8 AND CUMMINS ISL ENGINES TO ENHANCE PERFORMANCE AND RELIABILITY. *PE
TIB-45-342009-03-25. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:DIESEL. KENWORTH TRUCK: PX 6 ENGINE CALIBRATION. PACCAR CAMPAIGN C0836. TO UPGRADE THE ENGINE CONTROL SOFTWARE FOR THE PACCAR PX 6 ENGINE TO ENHANCE PERFORMANCE AND RELIABILITY.
TIB-44-172009-01-28. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL; ENGINE AND ENGINE COOLING:ENGINE:DIESEL. KENWORTH TRUCKS: REDUCED ENGINE POWER FROM FUEL STARVATION. ANY MODEL KENWORTH EQUIPPED WITH THE 2007 EMISSIONS COMPLIANT ISX ENGINE AND OPTIONAL DAVCO 382 FUEL FILTER, BUILT PRIOR TO 8/11/08, *PE
41-92008-11-08. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:DIESEL. KENWORTH: THE ORIGINAL PUBLICATION IDENTIFIED CHASSIS WITH PX-8 ENGINES ONLY. PX-8 AND ISC ENGINES-ENGINE WARNING LIGHT ON. *PE
13-252008-09-12. Service bulletin. SERVICE BRAKES, AIR:SUPPLY:QUICK RELEASE VALVE; SERVICE BRAKES, AIR:SUPPLY:CHECK VALVE. KENWORTH: T300 CHECK VALVE CAMPAIGN: CHASSIS IDENTIFIED MAY HAVE BEEN BUILT WITH AN AIR SYSTEM SINGLE CHECK VALVE RATHER THAN A SINGLE CHECK PRESSURE REDUCTION (SCPR) VALVE. *PE
02-1042008-06-09. Service bulletin. VISIBILITY:WINDSHIELD. WINDSHIELD REPAIRS ON CONVENTIONAL CABS. ALL C500'S, T300'S, T600'S, T800'S AND W900'S EQUIPPED WITH CURVED GLASS. MODEL YEAR UNKNOWN. *NJ

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.