RecallRepo

2005 Monaco Coach Diplomat Recalls

Recalls on record Updated July 2026

The 2005 Monaco Coach Diplomat has 2 NHTSA recall campaigns affecting an estimated 1,275 vehicles. Recall repairs are always free at any authorized dealer. Owners have filed 1 complaint with NHTSA, most often about the electrical system. Last updated July 5, 2026.

Recall campaigns

EQUIPMENT 04V598000 2004-12-23 86 affected
Defect

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.

Consequence

EXPOSURE OF THE OCCUPANTS TO CARBON MONOXIDE COULD RESULT IN INJURY OR DEATH.

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.

ENGINE AND ENGINE COOLING 04V441000 2004-09-13 1,189 affected
Defect

ON CERTAIN MOTORHOMES EQUIPPED WITH CUMMINS ENGINES, OIL CAN LEAK INTO THE ENGINE COMPARTMENT FROM A CRACK IN THE CUP PLUG.

Consequence

OIL LEAKAGE ON A HOT ENGINE CAN RESULT IN AN ENGINE COMPARTMENT FIRE, POSSIBLY RESULTING IN INJURIES.

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.

Complaints by component

ELECTRICAL SYSTEM
1
1fires
Total complaints1

What owners report

Verbatim reports filed with NHTSA, lightly edited for readability and with personal information removed.

“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.”

ELECTRICAL SYSTEM · reported 2011-11-09
Sources & methodology

Recall, complaint, and investigation records from official NHTSA datasets (FLAT_RCL, FLAT_CMPL, FLAT_INV), synced weekly. Counts reflect NHTSA records for the 2005 Monaco Coach Diplomat as of July 5, 2026. Complaint narratives are consumer-submitted and unverified. This page contains ads and affiliate links. Full methodology.