- The problem
- Certain heavy duty vehicles fail to comply with the requirements of federal motor vehicle safety standard no. 121, "Air brake systems." Improper seating of the check valve retainer in the brass fitting housing has occurred. It is possible for the air brake system pressure to push the check valve internal parts into the primary system reservoir and a vehicle operator would not know that this has happened.
- The risk
- In this condition, the vehicle would not meet the emergency requirements of the standard.
- The fix
- Dealers will replace the check valve. Owner notification began november 26, 2003. Owners should contact mack at 1-610-709-3337.
Vehicle safety record
2003 Mack DMM Problems, complaints & recalls
No owner complaints about the 2003 Mack DMM have been filed with NHTSA. It is covered by 1 recall, the latest in July 2003 for the check valve.
NHTSA data checked
CAbout as many problems as a typical DMM year, for its age
- Complaints
- 0
- Recalls
- 1
- Crashes
- 0
- Fires
- 0
- Injuries
- 0
- Deaths
- 0
2003 Mack DMM recalls 1
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
What owners say
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No complaints about the 2003 Mack DMM 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 DMM: every year compared
All DMM years2003 Mack DMM vs rivals
| Vehicle | Complaints | Recalls | Grade | |
|---|---|---|---|---|
| 2003 Mack DMM | 0 | 1 | C | |
| 2003 Mack CV | 2 | 5 | C | Compare |
More sales usually means more complaints, so compare similar vehicles of the same year. The grade compares each vehicle with its own model's other years.
Questions about the 2003 Mack DMM
Does the 2003 Mack DMM have any recalls?
Yes - NHTSA lists 1 recall for the 2003 Mack DMM: check valve (July 2003). 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 2003 Mack DMM had?
None have been filed with NHTSA so far.
Is the 2003 Mack DMM a reliable vehicle?
Its Safety Index is 50 out of 100 (grade C: about as many problems as a typical Mack DMM 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 2003 Mack DMM 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