Verdict · NHTSA data
Limited data — recalls on file
NHTSA has just 0 complaints on file for the 2004 Mack Cxn — too few to judge reliability from owner reports alone — but 10 recall campaigns apply to this year, so any used example should have its VIN checked for completed recall work.
0
NHTSA complaints
10
Recalls
0
Investigations
0
Crash-involved
0
Fires reported
0
Injuries
0
Deaths
—
NCAP overall
10 NHTSA recall campaigns on file. Recall repairs are free at franchised dealers.
Defect
MACK IS RECALLING 34,269 MY 1999-2005 CX AND MY 2004-2008 CXN TRUCKS. THE HEADLIGHT SWITCH MAY PREMATURELY FAIL RESULTING IN INOPERATIVE OR INTERMITTENT HEADLIGHTS.
Consequence
THE HEAD LIGHTS MAY NOT OPERATE PROPERLY WHICH COULD RESULT IN INTERMITTENT OR NO HEADLIGHT FUNCTION. THIS COULD IMPAIR A DRIVER'S VISIBILITY, INCREASING THE RISK OF A CRASH.
Remedy
DEALERS WILL REPLACE THE HEADLIGHT SWITCH. THE RECALL BEGAN ON FEBRUARY 27, 2009. OWNERS MAY CONTACT MACK AT 1-800-528-6586.
Defect
ON CERTAIN TRUCKS EQUIPPED WITH ASET AC MODEL ENGINES, THE ENGINE AS CONFIGURED WITH AN EXTERNAL EXHAUST GAS RECIRCULATION SYSTEM MAKES SERVICING THE FUEL INJECTION LINES DIFFICULT WHEN USING TRADITIONAL TOOLS. THEREFORE, IT IS POSSIBLE FOR FUEL LEAKS TO DEVELOP WHEN REMOVING AND INSTALLING THE FUEL INJECTION LINES.
Consequence
A LEAK IN THE FUEL INJECTION LINE MAY SPRAY FUEL ON THE HOT SURFACES OF THE EXHAUST GAS RECIRCULATION SYSTEM, WHICH COULD RESULT IN AN ENGINE FIRE.
Remedy
DEALERS WILL REPLACE THE FUEL INJECTION LINES FREE OF CHARGE. NOTE: THIS RECALL SUPERSEDES A PREVIOUS CAMPAIGN CONDUCTED IN 2006 (PLEASE SEE 06V392). THE RECALL BEGAN ON SEPTEMBER 11, 2007, WITH SUBSEQUENT MAILINGS EVERY SIX WEEKS UNTIL APRIL 2008. OWNERS MAY CONTACT MACK AT 800-528-6586.
Defect
ON CERTAIN TRUCKS, A LEAK IN THE ASET AC FUEL INJECTION LINE MAY SPRAY FUEL ON THE EXHAUST GAS RECIRCULATION PIPES THAT CARRY HOT EXHAUST GASES .
Consequence
THIS COULD POTENTIALLY RESULT IN AN ENGINE FIRE.
Remedy
MACK HAS ISSUED A STOP WORK ON THIS CAMPAIGN UNDER FURTHER NOTICE (2-22-2007). THE REMEDY DOES NOT ADEQUATELY ADDRESS THE ISSUE ON ALL VEHICLES. MACK WILL RE-RELEASE THE RECALL IN THE NEAR FUTURE. (PLEASE SEE NHTSA NO. 07V159/MACK RECALL NO. SCO323 FOR VEHICLES THAT HAVE HAD THIS REPAIR ALREADY PERFORMED.) THIS RECALL HAS BEEN SUPERSEDED (PLEASE SEE 07V401/SC0324).
Defect
ON CERTAIN TRUCKS, THE FUEL LINE CROSSOVER BRACKET MAY PREMATURELY FAIL AND UNEXPECTEDLY FALL TO THE ROAD. THE LOCATION AND SIZE OF THE BRACKET DRAWS A CONCERN TO THE BRACKET BEING PICKED UP AND THROWN BY THE DRIVE AXLE WHEELS.
Consequence
IF THE CROSSOVER BRACKET FALLS A CRASH MAY OCCUR WITHOUT PRIOR NOTICE.
Remedy
DEALERS WILL REPLACE THE BRACKETS FREE OF CHARGE. THE RECALL BEGAN ON AUGUST 20, 2006. OWNERS MAY CONTACT MACK TRUCKS AT 1-800-528-6586.
Defect
ON CERTAIN VEHICLES, THE BRAKE CAM TUBES ON THE STEER AND DRIVE AXLES MAY NOT HAVE BEEN GREASED.
Consequence
THE BRAKE CAM JOURNAL MAY CORRODE WHICH COULD LEAD TO THE BRAKES DRAGGING. THIS COULD RESULT IN A VEHICLE FIRE.
Remedy
DEALERS WILL REMOVE THE BRAKE CAMSHAFT TO INSPECT FOR CORROSION. THE BRAKE CAMSHAFT WILL BE REPLACED AS REQUIRED FREE OF CHARGE. THE RECALL BEGAN ON FEBRUARY 27, 2006. OWNERS MAY CONTACT MACK AT 1-336-393-2233.
Defect
ON CERTAIN VEHICLES. THE BRAKE CAM TUBES ON THE DRIVE AXLE MAY NOT HAVE BEEN GREASED.
Consequence
THE BRAKE CAM JOURNAL MAY CORRODE WHICH COULD LEAD TO THE BRAKES DRAGGING. THIS COULD RESULT IN A VEHICLE FIRE.
Remedy
DEALERS WILL REMOVE THE BRAKE CAMSHAFT TO INSPECT FOR CORROSION. THE BRAKE CAMSHAFT WILL BE REPLACED AS REQUIRED FREE OF CHARGE. THE RECALL BEGAN ON JANUARY 18, 2006. OWNERS MAY CONTACT MACK AT 1-336-393-2233.
Defect
ON CERTAIN VEHICLES, THE BRAKE CAM TUBES ON THE STEER AXLE MAY NOT HAVE BEEN GREASED.
Consequence
THE BRAKE CAM JOURNAL MAY CORRODE WHICH COULD LEAD TO THE BRAKES DRAGGING. THIS COULD RESULT IN A VEHICLE FIRE.
Remedy
DEALERS WILL REMOVE THE BRAKE CAMSHAFT TO INSPECT FOR CORROSION. THE BRAKE CAMSHAFT WILL BE REPLACED AS REQUIRED FREE OF CHARGE. THE RECALL BEGAN ON FEBRUARY 27, 2006. OWNERS MAY CONTACT MACK AT 1-336-393-2233.
Defect
ON CERTAIN HEAVY DUTY CLASS 8 TRUCKS EQUIPPED WITH AIR SUSPENSION PROPRIETARY AXLES AND ADJUSTABLE LENGH TORQUE RODS, AN INTERFERENCE BETWEEN THE ADJUSTABLE TORQUE ROD AND THE BRAKE CHAMBER ON THE LEFT SIDE OF THE CHASSIS MAY EXIST. THE SPRING BRAKE CHAMBER CLAMP RING COULD POSSIBLY BE DISTORTED OVER TIME RESULTING IN LOSS OF AIR, WHICH COULD LEAD TO THE SPRING BRAKE AT THE CHAMBER BEING INADVERTENTLY APPLIED.
Consequence
BRAKING CAPABILITY WOULD BE DIMINISHED, INCREASING THE RISK OF A CRASH.
Remedy
DEALERS WILL REPAIR AND REPLACE THE ADJUSTABLE TORQUE ROD, WITH A FIXED LENGTH TORQUE ROD, INSPECT AND REPAIR THE BRAKE CHAMBER FREE OF CHARGE. THE RECALL BEGAN ON MAY 3, 2005. OWNERS MAY CONTACT MACK TRUCKS AT 610-709-2131.
Defect
ON CERTAIN TRUCKS EQUIPPED WITH THE FXL AXLE AND MERITOR 16.5 X 5 BRAKES WITH DUST SHIELDS, THERE MAY BE INTERFERENCE BETWEEN THE DUST SHIELD MOUNTING BOLT AND THE KNUCKLE ON THE FRONT AXLE. AS A RESULT OF THE INTERFERENCE, THE BOLT JOINT BETWEEN THE WHEEL END AND THE KNUCKLE MAY NOT MEET THE TORQUE REQUIREMENTS.
Consequence
THIS COULD RESULT IN VIBRATION OR BRAKE PERFORMANCE ISSUES. BRAKING CAPABILITY WOULD BE DIMINISHED, INCREASING THE RISK OF A CRASH.
Remedy
DEALERS WILL REMOVE THE HUB AND BRAKE ASSEMBLY TO INSTALL A NEW DUST SHIELD FREE OF CHARGE. THE RECALL BEGAN ON AUGUST 17, 2005. OWNERS MAY CONTACT MACK TRUCKS 610-709-2131.
Defect
ON CERTAIN HEAVY DUTY CLASS 8 DIESEL TRUCKS EQUIPPED WITH ASET AC ENGINES, THE LOCATION OF THE FUEL INLET HOSE MAY RESULT IN OVERHEATING OR ABRASION OF THE HOSE, WHICH MAY LEAD TO A PREMATURE FAILURE.
Consequence
IF THE HOSE FAILS, FUEL CAN BE SPRAYED ON THE EXHAUST MANIFOLD, WHICH COULD POTENTIALLY LEAD TO AN ENGINE COMPARTMENT FIRE.
Remedy
DEALERS WILL REPAIR AND REPLACE THE FUEL INLET HOSE FREE OF CHARGE. THE RECALL BEGAN ON FEBRUARY 14, 2005. DUE TO SOME QUALITY AND SUPPLY ISSUES WITH PARTS TO SUPPORT THIS SAFETY RECALL, OWNERS MAY HAVE BEEN INFORMED DURING APRIL 2005,THAT THE SAFETY RECALL WAS ON HOLD. THESE ISSUES HAVE NOW BEEN RESOLVED. FOR OWNERS WHO HAVE NOT HAD THEIR VEHICLE(S) REPAIRED, CONTACT A MACK PARTS AND SERVICE CENTER IMMEDIATELY TO SCHEDULE AN APPOINTMENT TO HAVE YOUR VEHICLE(S) REPAIRED. OWNERS MAY CONTACT MACK TRUCKS AT 610-709-2131.
The record is thin — 0 NHTSA complaints — so owner-report data can't strongly confirm reliability either way, though 10 recalls should be verified as completed.
Yes — NHTSA lists 10 recall campaigns affecting the 2004 Mack Cxn. Recall repairs are free at franchised dealers; check the VIN at nhtsa.gov/recalls to confirm the work was done.
Based on NHTSA ODI data through June 2026. Complaints are consumer-reported and unverified. Updated July 5, 2026.
Compiled by Sharon Ben-Moshe, Founder.