NHTSA vehicle safety data
2005 Monaco Coach Diplomat Recalls & Complaints
The 2005 Monaco Coach Diplomat has 2 NHTSA recall campaigns and 1 owner complaint on file as of November 3, 2026. Recall repairs are usually free at an authorized Monaco Coach dealer.
NHTSA recall and complaint data for the 2005 Monaco Coach Diplomat. Recall data is refreshed daily from NHTSA.
2005 Monaco Coach Diplomat owner complaints
Owners have filed 1 complaint with NHTSA about the 2005 Monaco Coach Diplomat, describing incidents dated November 9, 2011.
Most-cited components
- Electrical System 1 complaint
The complaint on file reports a fire (owner-reported, not verified by NHTSA).
Newest complaints
ODI #10455639 · Filed
TL* THE CONTACT OWNS A 2005 MONACO COACH DIPLOMAT. WHILE EXAMING THE VEHICLE, THE CONTACT NOTICED THAT THE TRANSFER SWITCH HAD BURNED. THE VEHICLE WAS TAKEN TO A LOCAL DEALER, WHERE THE SURGE PROTECTOR WAS REPLACED. THE FAILURE AND CURRENT MILEAGES WERE 33,000.
MONACO/WATER HEATER EXHAUST
NHTSA #04V598000 · Equipment — Recreational Vehicle/Trailer — LPG Systems — Water Heater · NHTSA notice
Reported December 23, 2004 · MONACO COACH CORPORATION
Potentially affected: 86 vehicles
Monaco Coach campaign R04047 · Owners notified March 25, 2005 · Vehicles built January 20, 2003 – August 10, 2004 (per NHTSA)
Defect description
ON CERTAIN MOTOR HOMES, THE WATER HEATER EXHAUST ON THE CURVE SIDE WALL UNDER THE BACK SIDE OF THE KITCHEN SLIDEOUT ROOM BOX TERMINATES UNDER THE SLIDE BOX WHEN IN THE EXTENDED POSITION. THIS DESIGN COULD CREATE A RISK OF MIGRATION OF CARBON MONOXIDE INTO THE INTERIOR OF THE MOTOR HOME.
Safety consequence
EXPOSURE OF THE OCCUPANTS TO CARBON MONOXIDE COULD RESULT IN INJURY OR DEATH.
Manufacturer remedy
DEALERS WILL REPLACE THE WATER HEATER WITH A 16 GALLON ATWOOD UNIT THAT HAS A DIFFERENT EXHAUST TERMINATION. THE RECALL BEGAN MARCH 25, 2005. OWNERS SHOULD CONTACT MONACO AT 1-800-685-6545.
Notes
MONACO RECALL NO,. R04047.CUSTOMERS CAN ALSO CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION'S AUTO SAFETY HOTLINE AT 1-888-DASH-2-DOT (1-888-327-4236).
MONACO/CUMMINGS/ENGINE BLOCK BOSS HOLE
NHTSA #04V441000 · Engine and Engine Cooling — Engine — Diesel · NHTSA notice
Reported September 13, 2004 · MONACO COACH CORPORATION
Potentially affected: 1,189 vehicles
Vehicles built December 12, 2003 – April 12, 2004 (per NHTSA)
Defect description
ON CERTAIN MOTORHOMES EQUIPPED WITH CUMMINS ENGINES, OIL CAN LEAK INTO THE ENGINE COMPARTMENT FROM A CRACK IN THE CUP PLUG.
Safety consequence
OIL LEAKAGE ON A HOT ENGINE CAN RESULT IN AN ENGINE COMPARTMENT FIRE, POSSIBLY RESULTING IN INJURIES.
Manufacturer 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 1-800-343-7357 OR MONACO AT 1-800-685-6545.
Notes
CUSTOMERS CAN ALSO CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION'S AUTO SAFETY HOTLINE AT 1-888-DASH-2-DOT (1-888-327-4236).
Other Monaco Coach Diplomat model years
Check your 2005 Monaco Coach Diplomat VIN
Not every recall applies to every VIN in a given year. Enter the 17-character VIN from your Monaco Coach Diplomat at nhtsa.gov/recalls to see whether your specific vehicle has an unrepaired recall.
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