2003 Mack DMM Problems: 0 Complaints, 1 Recall

The worst 2003 Mack DMM problems

Ranked by number of owner complaints. Mileage and cost come from what owners wrote.

Tap a problem to see which part fails, at what mileage and in which other years.

Service brakes, air: supply: check valveReported July 17, 2003 · 1,232 vehicles affected

What is wrong: 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.
Risk: In this condition, the vehicle would not meet the emergency requirements of the standard.
Remedy: Dealers will replace the check valve. Owner notification began november 26, 2003. Owners should contact mack at 1‑610‑709‑3337.

Recall number 03V253000 · Recall details

Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.

Used buying checklistWhat to check on a 2003 Mack DMM before you buy

Is the 2003 Mack DMM reliable?

Owners have filed 0 complaints about the 2003 Mack DMM.

What is the most common problem with the 2003 Mack DMM?

There are not enough complaints to tell.

How many recalls does the 2003 Mack DMM have?

1 recall, covering service brakes, air.

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