WenmarOpen by Wenmar Pro

Service bulletins for the 2003 Mack CHN

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.

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

By type

By component

By trouble code

Only bulletins with component: Engine are shown. Show all

Bulletins, newest first
KC-21122022-07-05. Service bulletin. ELECTRICAL SYSTEM; POWER TRAIN; ENGINE AND ENGINE COOLING. Programming Failure - Chassis With Cummins Engine And An Allison Transmission
KC-7502022-07-05. Service bulletin. ENGINE AND ENGINE COOLING. US10 Emission Engines - Diagnostic Trouble Code ( DTC ) SPN 1231 FMI 9 Troubleshooting.
KC-6632022-06-07. Service bulletin. ENGINE AND ENGINE COOLING. Emcon (Spark Assist) Engine Aftertreatment System Troubleshooting Check Sheet - US07 Emissions
KC-6532022-06-07. Service bulletin. ENGINE AND ENGINE COOLING. Low Oil Pressure Diagnostic Process For 11 Liter Engines
KC-21712022-06-07. Service bulletin. ENGINE AND ENGINE COOLING. Temperature Sensor Troubleshooting Guide - US10+OBD13 And Newer
KC-21652022-06-07. Service bulletin. ENGINE AND ENGINE COOLING. DEF Pump Troubleshooting Guide - US10+OBD13 And Newer Emissions
KC-21612022-06-07. Service bulletin. ENGINE AND ENGINE COOLING. DEF Pump Cycling periodically Hours After Key Off
KC-21582022-06-07. Service bulletin. ENGINE AND ENGINE COOLING. Selective Catalytic Reduction (SCR) Muffler Troubleshooting Guide - US10+OBD13 And Newer Emissions
KC-21312022-06-07. Service bulletin. ENGINE AND ENGINE COOLING. USE FOR NEW VEHICLES (US21+OBD22 Emissions) - Intermittent Diagnostic Trouble Codes U02A3, U029D, U029E
KC-21162022-06-07. Service bulletin. ENGINE AND ENGINE COOLING. NOx Sensor Troubleshooting Guide - US10+OBD13 And Newer Emissions
KC-6982022-06-07. Service bulletin. ENGINE AND ENGINE COOLING. Mack Chassis - Diesel Exhaust Fluid ( DEF ) System Cleaning/Flush After DEF Pump Failure Or System Contamination
KC-7142022-06-07. Service bulletin. ENGINE AND ENGINE COOLING. Mack Chassis - Diagnostic Trouble Codes ( DTC's ) - P020113, P020213, P020313, P020413, P020513, P020613, Cylinders 1 Through 6 Injector A Open Circuit
K120342412019-02-19. Service bulletin. ENGINE. Diagnosing Performance Complaints ASET Engine
K751153062019-02-19. Service bulletin. ENGINE AND ENGINE COOLING. V-MAC III Engine Cranks But No Start
K103558802019-02-19. Service bulletin. ENGINE AND ENGINE COOLING. V-MAC III - Severe Engine Stumble
K837415262019-02-19. Service bulletin. ENGINE AND ENGINE COOLING. V-MAC - Jacobs Engine Brake Works Intermittently Between 2000 To 2100 RPM
FSB-214-0242011-08-15. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:MANIFOLD/HEADER/MUFFLER/TAIL PIPE. MACK TRUCKS: THERE IS REVISED MOUNTING HARDWARE FOR THE EXHAUST MANIFOLD AND TURBOCHARGER. *RM
SB-26-10182009-05-22. Service bulletin. ENGINE AND ENGINE COOLING:COOLING SYSTEM. MACK TRUCKS: MERITOR WABCO AIR COMPRESSOR, CONVENTIONAL REPAIR FOR CERTAIN AIR COMPRESSOR FAILURES, SUCH AS FAILURE OF COMPRESSOR TO PUMP, SLOW AIR SYSTEM PRESSURE BUILD UP TIME, INTERMITTENT COMPRESSOR PUMPING, ETC, WAS TO REPLACE COMPRESSOR CYLINDER HEAD. MODEL YEARS UNKNOWN. *PE
2340102005-01-27. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM. VERTICAL EXHAUST STACK HEAT SHIELD CLAMPS. MACK CXN, CHN MODELS. *TT

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