The 1988 Mack Mh has 4 NHTSA recall campaigns affecting an estimated 50,948 vehicles. Recall repairs are always free at any authorized dealer. Last updated July 5, 2026.
FUEL INJECTION SYSTEM RECONFIGURATION TO COMPLY WITH ENGINE EMISSION STANDARDS CAUSE HIGHER ENGINE VIBRATION LEVELS WHICH LEAD TO EARLY WEAR AND COMPLETE FAILURE OF THE SECONDARY THROTTLE RETURN MECHANISM.
IN THE EVENT THE PRIMARY THROTTLE RETURN FAILS, FAILURE OF THE SECONDARY THROTTLE RETURN SYSTEM WOULD NOT PROVIDE PROTECTION AGAINST LOSS OF THROTTLE CONTROL.
A NEW PRODUCTION SECONDARY THROTTLE RETURN SYSTEM CONFIGURATION WILL BE INSTALLED.
DOWELS MAY HAVE BEEN OMITTED DURING SPRING CAP INSTALLATION; THIS WOULD PUT SHEAR LOAD ON THE FOUR (4) SPRING CAP BOLTS.
THIS COULD RESULT IN LOOSENING AND FAILURE OF THE BOLTSWITH POSSIBLE LOSS OF CONTROL AND ACCIDENT POTENTIAL.
INSTALL THE MISSING DOWELS TO PREVENT MOVEMENT BETWEEN THE SPRING CAP AND AXLE HOUSING.
SEAT TETHER BELT 11.0 INCHES LONG WAS INSTALLED INSTEAD OF THE 8.5 INCHES LONG BELT REQUIRED FOR THIS CHASSIS.
INCORRECT LENGTH BELT MAY NOT PROPERLY RESTRAIN OCCUPANTAND WOULD NOT COMPLY WITH FMVSS 210.
INSTALL CORRECT 8.5 INCH SEAT TETHER BELT.
SEAT TETHER BELTS MAY NOT HAVE BEEN ADJUSTED DURING ASSEMBLY.
DURING AN IMPACT, DRIVER AND/OR RIDER CAN MOVE FORWARDAND POSSIBLY STRIKE THE WINDSHIELD, EVEN WHEN WEARING A SEAT BELT.
ADJUST SEAT TETHER BELT IF NECESSARY.
Recall, complaint, and investigation records from official NHTSA datasets (FLAT_RCL, FLAT_CMPL, FLAT_INV), synced weekly. Counts reflect NHTSA records for the 1988 Mack Mh as of July 5, 2026. Complaint narratives are consumer-submitted and unverified. This page contains ads and affiliate links. Full methodology.