- The problem
- 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.
- The risk
- 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 fix
- A new production secondary throttle return system configuration will be installed.
Vehicle safety record
1989 Mack MH Problems, complaints & recalls
No owner complaints about the 1989 Mack MH have been filed with NHTSA. It is covered by 2 recalls, the latest in February 1994 for the vehicle speed control.
NHTSA data checked
BFewer problems than a typical MH year, for its age
- Complaints
- 0
- Recalls
- 2
- Crashes
- 0
- Fires
- 0
- Injuries
- 0
- Deaths
- 0
1989 Mack MH recalls 2
Recall repairs are free. Your dealer fixes them whether or not you bought the car there - check your VIN at nhtsa.gov/recalls to see if yours is done. What to do
- The problem
- Torque rod bolts are grade 2 instead of grade 5, which is not to specification, and could fail.
- The risk
- Bolt failure could allow the rear axle to shift; thiscould adversely affect truck control and could result in a crash.
- The fix
- Replace torque rod bolts with bolts of the proper specification.
What owners say
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No complaints about the 1989 Mack MH yet
No owner has filed a complaint about this vehicle with NHTSA. If yours has a problem, share it here and report it to NHTSA.
Mack MH: every year compared
All MH yearsQuestions about the 1989 Mack MH
Does the 1989 Mack MH have any recalls?
Yes - NHTSA lists 2 recalls for the 1989 Mack MH: vehicle speed control (February 1994); front (May 1989). Recall repairs are free at any authorized dealer. Enter your VIN at nhtsa.gov/recalls to see whether yours has been fixed.
How many complaints has the 1989 Mack MH had?
None have been filed with NHTSA so far.
Is the 1989 Mack MH a reliable vehicle?
Its Safety Index is 70 out of 100 (grade B: fewer problems than a typical Mack MH year, for its age). The index weighs complaints, crashes, fires, injuries, deaths and recalls against how long the vehicle has been on the road, compared with the same model's other years. It is not a measure of every repair - read the complaints and owner experiences, and have any used vehicle inspected before you buy.
What should I do if my 1989 Mack MH has a problem?
If it is a safety problem, stop driving it if it is unsafe and contact your dealer. Report it to NHTSA at nhtsa.gov/report-a-safety-problem - enough reports start investigations and recalls - and share your experience here so other owners know what to look for.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) complaints and recalls, checked . Complaints are owners' own reports and are not verified. How we use the data