2004 Monaco Coach Diplomat Recalls, Complaints & Specs
1 safety recall lists the 2004 Monaco Coach Diplomat, and owners have filed 4 complaints with NHTSA. Check your own VIN below.
1 safety recall for the 2004 Monaco Coach Diplomat
Most recent first. Recall repairs are free at any authorised dealer. Click a recall for the full defect, consequence and remedy text.
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Diesel (engine and engine cooling)
On certain motorhomes equipped with cummins engines, oil can leak into the engine compartment from a crack in the cup plug.
Remedy: Cummins is conducting the owner notification and remedy for this campaign. Cummins will install a steel cup plug boss cap to all affected engines. Owners should contact cummins customer assistance center at…
4 owner complaints filed with NHTSA
Owners of the 2004 Monaco Coach Diplomat have filed 4 complaints with NHTSA. The average mileage at failure in those reports is 2,753 miles. Complaints peaked in 2005 with 4 filed that year.
Most-reported components
What owners are reporting
“Dt: the caller has a problem with the front roadside slide on the motor home. They had it in for repair 8 different times, and it still is not fixed. To date the roadside slide is unstable. The slide”
Owner complaint to NHTSA, October 18, 2005 · Structure
“Defroster not working windshieldd iced over when driving from snow. When stoped defroster will output enough heat to melt ice. Heater defroster is sub standard insufficient hot water flow from rear mo”
Owner complaint to NHTSA, June 5, 2005 · Visibility
Compare Monaco Coach Diplomat model years
Recall and complaint counts for every Monaco Coach Diplomat model year in NHTSA's database.
Checking a specific 2004 Monaco Coach Diplomat
How do I know if my 2004 Monaco Coach Diplomat has an open recall?
Enter your 17-character VIN above. The VIN is on the driver's side dashboard (visible through the windshield), the driver's door jamb sticker, and your registration or insurance card. The check runs against NHTSA's live database and tells you which campaigns list your vehicle. 1 campaign currently lists the 2004 Monaco Coach Diplomat; your car may already have been repaired under it.
Is the recall repair free?
Yes. Under federal law, manufacturers must fix safety recalls at no charge for vehicles up to 15 years old from the date of sale to the first owner. Contact any authorised Monaco Coach dealer with your VIN and the NHTSA campaign number (for example 04V441000).
What is the difference between a recall and a complaint?
A recall is a safety campaign filed by the manufacturer or ordered by NHTSA, with a defined defect and remedy. A complaint is a report an owner sent to NHTSA; it is not verified, but patterns of complaints are what trigger NHTSA investigations and, eventually, recalls.
Other Monaco Coach models
- Knight54 complaints
- Cayman40 complaints
- Monaco33 complaints
- Lapalma30 complaints
- Dynasty25 complaints
- Windsor21 complaints
- Signature13 complaints
- Camelot7 complaints
Source: NHTSA recall and complaint databases and EPA fuel economy data, October 2026. Complaint counts are owner reports to NHTSA, not verified defects. Recall counts are safety campaigns that list this model year; whether a particular car was already repaired depends on its VIN. How this data is compiled.