2006 Monaco Coach Diplomat
Only 4 complaints on file — too few for a fair verdict.
This verdict reflects complaint volume compared to this model's typical year. Recalls and safety issues below apply regardless of the verdict — always check them.
Only 4 complaints on file — too few for a fair verdict. The data below is complete but unranked.
COMPLAINTS PER YEAR
View as data table
| Year | Complaints |
|---|---|
| 1998 | 1 |
| 1999 | 10 |
| 2000 | 14 |
| 2001 | 6 |
| 2002 | 2 |
| 2004 | 4 |
| 2005 | 1 |
| 2006 | 4 |
| 2007 | 1 |
| 2008 | 2 |
| 2009 | 1 |
| 2010 | 1 |
| 2011 | 1 |
KNOWN PROBLEM AREAS
Only 4 complaints on file for this model year -- too few to rank by share. Raw counts only, below.
2 of 4 total reports mention: engine and engine cooling.
Show complaint excerpts
RECALL BY CUMMINS ON ISL850 ENGINES INSTALLED ON 2006/7 MONACO MOTORHOMES. THE RECALL DOES NOT ADDRESS THE POSSIBLE ENGINE FAILURE ISSUE. IT ONLY PROTECTS THE ENGINE FROM BLOWING UP THUS SAVING CUMMINGS MONEY.
NHTSA ODI report, 20070831
1 of 4 total reports mentions: structure.
1 of 4 total reports mentions: fuel system, gasoline.
Show complaint excerpts
WHILE TRAVELING IN MONTANA IN OUR 2006 MONACO DIPLOMAT MOTORHOME WITH THE CUMMINS ISL400 ENGINE A FUEL LEAK DEVELOPED IN THE ENGINE.
NHTSA ODI report, 20070826
1 of 4 total reports mentions: engine and engine cooling.
Show complaint excerpts
WHILE TRAVELING IN MONTANA IN OUR 2006 MONACO DIPLOMAT MOTORHOME WITH THE CUMMINS ISL400 ENGINE A FUEL LEAK DEVELOPED IN THE ENGINE.
NHTSA ODI report, 20070826
SAFETY TIMELINE
ON CERTAIN MOTOR HOMES, THE HEADLIGHT SWITCH IN THE FRONT ELECTRICAL BOX/FIREWALL CAN OVERLOAD.
Remedy: DEALERS WILL INSTALL A NEW WIRING HARNESS. THE RECALL BEGAN ON SEPTEMBER 30, 2005. OWNERS MAY CONTACT MONACO AT 1-800-685-6545.
Campaign 05V366000 — check if this car was fixed
ON CERTAIN MOTOR HOMES BUILT WITH CUMMINS ISL CM850 DIESEL ENGINES, THE CONNECTING ROD CONTAINS A MACHINING DEFECT IN THE WRIST PIN BUSHING OF THE ROD THAT COULD CAUSE A SEIZURE OF THE PISTON PIN.
Remedy: MONACO IS WORKING WITH CUMMINS TO RECALIBRATE THE ENGINE CONTROL MODULE AND ENHANCE THE ENGINE PROTECTION SYSTEM ENABLING IT TO PROVIDE EARLY DETECTION OF THE FAILURE MODE AND AVOID MORE SERIOUS ENGIN
Campaign 07V311000 — check if this car was fixed
MONACO IS RECALLING 1,733 MY 2006-2007 DIPLOMAT AND HOLIDAY RAMBLER ENDEAVOR MOTOR HOMES EQUIPPED WITH WIPER SYSTEMS SUPPLIED BY AM EQUIPMENT. THE DRIVE MOTOR LINK BECOMES DISENGAGED DURING OPERATION
Remedy: MONACO WILL REPLACE THE COMPLETE UNDER-THE-HOOD WIPER SYSTEM WITH A NEW MODEL, REUSING THE WIPER ARM AND BLADES. THE RECALL BEGAN ON MARCH 11, 2008. OWNERS MAY CONTACT MONACO AT 1-800-685-6545.
Campaign 08V070000 — check if this car was fixed
BUY-SMART CHECKLIST
2006 Monaco Coach Diplomat — pre-purchase inspection
- Test/inspect for engine and engine cooling issues (2 reports on file for this year).
- Test/inspect for structure issues (1 reports on file for this year).
- Test/inspect for fuel system, gasoline issues (1 reports on file for this year).
- Verify recall 05V366000 (exterior lighting) has been completed.
- Verify recall 07V311000 (engine and engine cooling) has been completed.
- Verify recall 08V070000 (visibility) has been completed.
FAQ
Is the 2006 Monaco Coach Diplomat reliable?
There isn't enough NHTSA complaint data on file yet to give this model year a verdict.
What are the most common problems with the 2006 Monaco Coach Diplomat?
The most-reported component is engine and engine cooling:engine:diesel, accounting for 50% of complaints on file.
How many recalls does the 2006 Monaco Coach Diplomat have?
3 recalls on file for this model year.
Data updated 2026-07-11 · Complaints are unverified owner reports filed with NHTSA, not independently verified defects. Methodology.