1999 Monaco Coach Diplomat Problems
- Complaints
- 10filed with NHTSA
- Median mileage
- 38,218miles, 2 complaints with mileage
- Recalls
- 3campaigns on record
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
Sources: NHTSA records for the 1999 Monaco Coach Diplomat (complaints, recalls, investigations). Report an error
NHTSA recorded 10 consumer complaints for the 1999 Monaco Coach Diplomat. The part named most often is fuel system, with 3 complaints (30% of the total), followed by visibility (3) and brakes (2). 2 of the complaints include a mileage, and 100% of those were filed for vehicles with under 50,000 miles; the median is 38,218 miles. NHTSA lists 3 recall campaigns and 0 technical service bulletins for this model year.
This model year has fewer than 25 complaints on record, so the numbers below can change a lot with a few new reports.
Which parts are reported most
Complaints can name more than one part, so the counts add up to more than the total. Select a part to see its complaints, recalls and bulletins.
- Fuel system3 30%
- Brakes2 20%
- Equipment2 20%
- Tires2 20%
- Electrical system1 10%
- Other or unknown1 10%
- Body and structure1 10%
Example complaints
Fuel system: “While driving fuel was leaking from the vehicle, it was leaking onto oncoming traffic. Contacted dealer ,and dealer replaced fuel tank. Fuel tank has been replaced twice already.”
NHTSA complaint #8002231, filed 2002-01Visibility (wipers, defrost, mirrors): “Windshield pops out of motorhome in middle where the moulding is. This is the fourth time this has happened. Dealer is not able to correct this problem. Please provide any further details.”
NHTSA complaint #840917, filed 1999-06Brakes: “While driving 65 MPH, the air dryer on the air brakes had blown apart which caused the brakes to lose power. The driver was able to avoid a collision and the motor home was towed to the residence.”
NHTSA complaint #10033879, filed 2003-09Equipment: “Recall received for the wrong PSI on the original tag for tire equipment/ vehicle suffered tire blowout. The consumer received recall 03v386000 which indicated that the wrong PSI was put on the original id tag. The consumer contacted the local dealer but they refused to handle the recall because the vehicle wasn't purchased there. After receiving the recall notice the consumer's rv had a sudden blowout on the right rear tire. …”
NHTSA complaint #10053543, filed 2004-01Mileage when problems were reported
100% of the 2 complaints with a mileage were filed for vehicles with under 50,000 miles; the middle half falls between 36,000 and 40,437 miles.
Complaints by year filed
Fewer than 15 complaints, too few for a reliable trend.
Recalls and investigations
- 08V257000Jun 5, 2008Equipment › Recreational vehicle/trailerCovers: Monaco Coach Diplomat 1999–2002, Holiday Rambler Vacationer 1998–2002, Monaco Coach Dynasty 1998, 2000–2003 +24 more
Monaco is recalling certain motor homes equipped with norcold refrigerators. A fatigue failure in the section of the cooling unit which contains the refrigerant could allow the liquid solution to slowly leak.
- 03V386000Oct 10, 2003Equipment › Other › LabelsCovers: Monaco Coach Diplomat 1999
On certain motor homes, the federal identification tag on both 36' and 38' models was incorrect. The initial tag shows the psi as 90 lbs. Front and 100 lbs. Rear. The correct psi is 105 front and 115 rear. Also, the federal identification tag on certain…
- 03V166000May 8, 2003Equipment › Recreational vehicle/trailerCovers: Monaco Coach Diplomat 1998–1999, Executive 1997–1999, Beaver Marquis 1997–1999 +25 more
On certain motorhomes, fifth wheels and travel trailers equipped with norcold refrigerator cooling units model numbers 1200lr and 1200rim, these refrigerators can experience low cycle fatigue failure which can lead to the liquid solution slowly leaking from…
Recall details for the 1999 Monaco Coach Diplomat → · Check a VIN at nhtsa.gov/recalls
Technical service bulletins
No technical service bulletins are on record for the 1999 Monaco Coach Diplomat.
Other model years of the Monaco Coach Diplomat
| Year | Complaints | Median mi | Recalls | Crash ★ | MPG | Score (50 = typical) | Trend |
|---|---|---|---|---|---|---|---|
| 2001 | 6 | 29,000 | 4 | — | — | — | Not enough data |
| 2000 | 14 | 24,184 | 2 | — | — | — | Not enough data |
| 1999 | 10 | 38,218 | 3 | — | — | — | Not enough data |
All Monaco Coach Diplomat model years
Frequently asked questions
How many NHTSA complaints does the 1999 Monaco Coach Diplomat have?
NHTSA recorded 10 consumer complaints for the 1999 Monaco Coach Diplomat as of Oct 30, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
What part of the 1999 Monaco Coach Diplomat is reported most often?
Fuel system is named most often, in 3 complaints (30% of the total), followed by visibility with 3.
Has the 1999 Monaco Coach Diplomat been recalled?
NHTSA lists 3 recall campaigns for this model year. To check a specific vehicle, enter its VIN at nhtsa.gov/recalls.
At what mileage are problems with the 1999 Monaco Coach Diplomat reported?
Among the 2 complaints that include a mileage, the median is 38,218 miles and the middle half falls between 36,000 and 40,437 miles; 100% were filed for vehicles with under 50,000 miles.
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 30, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
Complaint counts come from NHTSA’s public complaint database; we count each complaint once. The source records for this vehicle are on nhtsa.gov. Scores and trends are our own summaries of that data, described in the methodology. This page is not legal, safety or repair advice: for a specific vehicle, check its VIN at nhtsa.gov/recalls and ask a qualified mechanic. See an error? Tell us.