NHTSA recall 94V032000

A recall listed here may apply to a vehicle of this year, make and model. Only the manufacturer can say whether it applies to one vehicle: check the VIN with the official lookups.

Campaign
Published by	NHTSA (United States)
Campaign number	94V032000
Manufacturer	MACK TRUCKS, INCORPORATED
Reported	1994-02-15
Owners notified	1994-05-27
Component	VEHICLE SPEED CONTROL
Units potentially affected	39777

What is wrong

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.

What can happen

IN THE EVENT THE PRIMARY THROTTLE RETURN FAILS, FAILURE OF THE SECONDARY THROTTLE RETURN SYSTEM WOULD NOT PROVIDE PROTECTION AGAINST LOSS OF THROTTLE CONTROL.

The remedy

A NEW PRODUCTION SECONDARY THROTTLE RETURN SYSTEM CONFIGURATION WILL BE INSTALLED.

Notes

SYSTEM: FUEL; FUEL PUMP.VEHICLE DESCRIPTION: CLASS 8 TRUCKS EQUIPPED WITH E6 AND E7 ENGINES WITH ROBERT BOSCH P7100 MECHANICALLY-GOVERNED FUEL INJECTION PUMPS.NOTE: IF YOUR VEHICLE IS PRESENTED TO AN AUTHORIZED DEALER ON AN AGREED UPON SERVICE DATE AND THE REMEDY IS NOT PROVIDED WITHIN A REASONABLE TIME AND FREE OF CHARGE OR THE REMEDY DOES NOT CORRECT THE DEFECT OR NONCOMPLIANCE, PLEASE CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION'S AUTO SAFETY HOTLINE AT 1-800-424-9393.

Vehicles this campaign lists
1987 MACK CF	Built 1987-07-01 to 1992-07-01.
1988 MACK CF	Built 1987-07-01 to 1992-07-01.
1989 MACK CF	Built 1987-07-01 to 1992-07-01.
1990 MACK CF	Built 1987-07-01 to 1992-07-01.
1991 MACK CF	Built 1987-07-01 to 1992-07-01.
1992 MACK CF	Built 1987-07-01 to 1992-07-01.
1987 MACK CH	Built 1987-07-01 to 1992-07-01.
1988 MACK CH	Built 1987-07-01 to 1992-07-01.
1989 MACK CH	Built 1987-07-01 to 1992-07-01.
1990 MACK CH	Built 1987-07-01 to 1992-07-01.
1991 MACK CH	Built 1987-07-01 to 1992-07-01.
1992 MACK CH	Built 1987-07-01 to 1992-07-01.
1987 MACK CHR	Built 1987-07-01 to 1992-07-01.
1988 MACK CHR	Built 1987-07-01 to 1992-07-01.
1989 MACK CHR	Built 1987-07-01 to 1992-07-01.
1990 MACK CHR	Built 1987-07-01 to 1992-07-01.
1991 MACK CHR	Built 1987-07-01 to 1992-07-01.
1992 MACK CHR	Built 1987-07-01 to 1992-07-01.
1987 MACK CL	Built 1987-07-01 to 1992-07-01.
1988 MACK CL	Built 1987-07-01 to 1992-07-01.
1989 MACK CL	Built 1987-07-01 to 1992-07-01.
1990 MACK CL	Built 1987-07-01 to 1992-07-01.
1991 MACK CL	Built 1987-07-01 to 1992-07-01.
1992 MACK CL	Built 1987-07-01 to 1992-07-01.
1987 MACK DM	Built 1987-07-01 to 1992-07-01.
1988 MACK DM	Built 1987-07-01 to 1992-07-01.
1989 MACK DM	Built 1987-07-01 to 1992-07-01.
1990 MACK DM	Built 1987-07-01 to 1992-07-01.
1991 MACK DM	Built 1987-07-01 to 1992-07-01.
1992 MACK DM	Built 1987-07-01 to 1992-07-01.
1987 MACK DMM	Built 1987-07-01 to 1992-07-01.
1988 MACK DMM	Built 1987-07-01 to 1992-07-01.
1989 MACK DMM	Built 1987-07-01 to 1992-07-01.
1990 MACK DMM	Built 1987-07-01 to 1992-07-01.
1991 MACK DMM	Built 1987-07-01 to 1992-07-01.
1992 MACK DMM	Built 1987-07-01 to 1992-07-01.
1987 MACK FDM	Built 1987-07-01 to 1992-07-01.
1988 MACK FDM	Built 1987-07-01 to 1992-07-01.
1989 MACK FDM	Built 1987-07-01 to 1992-07-01.
1990 MACK FDM	Built 1987-07-01 to 1992-07-01.
1991 MACK FDM	Built 1987-07-01 to 1992-07-01.
1992 MACK FDM	Built 1987-07-01 to 1992-07-01.
1987 MACK MC	Built 1987-07-01 to 1992-07-01.
1988 MACK MC	Built 1987-07-01 to 1992-07-01.
1989 MACK MC	Built 1987-07-01 to 1992-07-01.
1990 MACK MC	Built 1987-07-01 to 1992-07-01.
1991 MACK MC	Built 1987-07-01 to 1992-07-01.
1992 MACK MC	Built 1987-07-01 to 1992-07-01.
1987 MACK MH	Built 1987-07-01 to 1992-07-01.
1988 MACK MH	Built 1987-07-01 to 1992-07-01.
1989 MACK MH	Built 1987-07-01 to 1992-07-01.
1990 MACK MH	Built 1987-07-01 to 1992-07-01.
1991 MACK MH	Built 1987-07-01 to 1992-07-01.
1992 MACK MH	Built 1987-07-01 to 1992-07-01.
1987 MACK MHR	Built 1987-07-01 to 1992-07-01.
1988 MACK MHR	Built 1987-07-01 to 1992-07-01.
1989 MACK MHR	Built 1987-07-01 to 1992-07-01.
1990 MACK MHR	Built 1987-07-01 to 1992-07-01.
1991 MACK MHR	Built 1987-07-01 to 1992-07-01.
1992 MACK MHR	Built 1987-07-01 to 1992-07-01.
1987 MACK MR	Built 1987-07-01 to 1992-07-01.
1988 MACK MR	Built 1987-07-01 to 1992-07-01.
1989 MACK MR	Built 1987-07-01 to 1992-07-01.
1990 MACK MR	Built 1987-07-01 to 1992-07-01.
1991 MACK MR	Built 1987-07-01 to 1992-07-01.
1992 MACK MR	Built 1987-07-01 to 1992-07-01.
1987 MACK R	Built 1987-07-01 to 1992-07-01.
1988 MACK R	Built 1987-07-01 to 1992-07-01.
1989 MACK R	Built 1987-07-01 to 1992-07-01.
1990 MACK R	Built 1987-07-01 to 1992-07-01.
1991 MACK R	Built 1987-07-01 to 1992-07-01.
1992 MACK R	Built 1987-07-01 to 1992-07-01.
1987 MACK RB	Built 1987-07-01 to 1992-07-01.
1988 MACK RB	Built 1987-07-01 to 1992-07-01.
1989 MACK RB	Built 1987-07-01 to 1992-07-01.
1990 MACK RB	Built 1987-07-01 to 1992-07-01.
1991 MACK RB	Built 1987-07-01 to 1992-07-01.
1992 MACK RB	Built 1987-07-01 to 1992-07-01.
1987 MACK RD	Built 1987-07-01 to 1992-07-01.
1988 MACK RD	Built 1987-07-01 to 1992-07-01.
1989 MACK RD	Built 1987-07-01 to 1992-07-01.
1990 MACK RD	Built 1987-07-01 to 1992-07-01.
1991 MACK RD	Built 1987-07-01 to 1992-07-01.
1992 MACK RD	Built 1987-07-01 to 1992-07-01.
1987 MACK RM	Built 1987-07-01 to 1992-07-01.
1988 MACK RM	Built 1987-07-01 to 1992-07-01.
1989 MACK RM	Built 1987-07-01 to 1992-07-01.
1990 MACK RM	Built 1987-07-01 to 1992-07-01.
1991 MACK RM	Built 1987-07-01 to 1992-07-01.
1992 MACK RM	Built 1987-07-01 to 1992-07-01.
1987 MACK RW	Built 1987-07-01 to 1992-07-01.
1988 MACK RW	Built 1987-07-01 to 1992-07-01.
1989 MACK RW	Built 1987-07-01 to 1992-07-01.
1990 MACK RW	Built 1987-07-01 to 1992-07-01.
1991 MACK RW	Built 1987-07-01 to 1992-07-01.
1992 MACK RW	Built 1987-07-01 to 1992-07-01.
1987 MACK U	Built 1987-07-01 to 1992-07-01.
1988 MACK U	Built 1987-07-01 to 1992-07-01.
1989 MACK U	Built 1987-07-01 to 1992-07-01.
1990 MACK U	Built 1987-07-01 to 1992-07-01.
1991 MACK U	Built 1987-07-01 to 1992-07-01.
1992 MACK U	Built 1987-07-01 to 1992-07-01.

A vehicle with no link is not in this site's catalog, which covers cars, multipurpose vehicles and trucks by model year. The campaign is from data as of 2026-10-19.

Investigated as SQ93015

This recall followed 1 NHTSA investigation. An investigation is NHTSA looking into a possible defect. It is not a finding that a defect exists, and it does not say that any one vehicle is affected.

NHTSA investigations that led to this recall
SQ93015	Service query.

From NHTSA's investigation file, as of 2026-10-19. The JSON has NHTSA's summary of each.

Bulletins for the same vehicles and component

Bulletins for the same vehicles and component
KC-2143	2022-07-05. Service bulletin. (Back Office) - Cruise Control Inoperative After Updating Software VECU5 Without ESP Package (UESP).
KC-686	2022-06-07. Service bulletin. (Back Office Only) Mack Chassis - Cruise Control Inoperative After Disabling The Electronic Stability Program (ESP)

A bulletin is the manufacturer's note to its dealers. It is not part of this recall.