NHTSA vehicle safety data

2006 Monaco Coach Diplomat Recalls & Complaints

The 2006 Monaco Coach Diplomat has 3 NHTSA recall campaigns and 4 owner complaints 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 2006 Monaco Coach Diplomat. Recall data is refreshed daily from NHTSA.

Pre-purchase inspection checklist → Reliability & 5-year cost forecast →

2006 Monaco Coach Diplomat owner complaints

Owners have filed 4 complaints with NHTSA about the 2006 Monaco Coach Diplomat, describing incidents dated July 19, 2007 to November 15, 2009.

Most-cited components

Engine 3 complaints
Fuel/Propulsion System 1 complaint
Structure 1 complaint

Newest complaints

ODI #10295375 · Filed December 11, 2009
MOTOR HOME BY MONACO BROKEN FRAME TRAILING ARMS. *TR
ODI #10228390 · Filed May 12, 2008
OWNER OF A 2006 40' MONACO DIPLOMAT RV MOTORHOME DELIVERED WITH A 400HP DIESEL ENGINE, MANUFACTURED BY CUMMINS INC. RECEIVED A RECALL NOTICE RE A POSSIBLE ENGINE FAILURE; HE IS REQUESTING HELP IN ORDERING CUMMINS TO INSTALL A PROPER MANUFACTURED ENGINE. *KB THE CONSUMER STATED THE REMEDY THE…
ODI #10201329 · Filed August 31, 2007
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. THE CORRECT FIX SHOULD BE A NEW ENGINE WHICH WOULD NOT HAVE THE UNCERTAINTY OF ENGINE…

Read all 4 complaints

WIPER SYSTEMS/AM EQUIPMENT

NHTSA #08V070000 · Visibility — Windshield Wiper/Washer — Linkages · NHTSA notice

Reported February 14, 2008 · MONACO COACH CORPORATION

Potentially affected: 1,733 vehicles

Monaco Coach campaign R08005 · Owners notified March 11, 2008 · Vehicles built January 24, 2005 – March 30, 2007 (per NHTSA)

Defect description

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 FROM THE WIPER DRIVE ARM WHERE IT ATTACHES TO THE DRIVE ARM CAUSING THE WIPER SYSTEM TO FAIL.

Safety consequence

WHEN THE WIPER SYSTEM FAILS, THE OPERATOR WILL HAVE REDUCED VISIBILITY WHICH COULD RESULT IN A CRASH.

Manufacturer 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.

Notes

MONACO RECALL NO. R08005.CUSTOMERS MAY ALSO CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION'S VEHICLE SAFETY HOTLINE AT 1-888-327-4236 (TTY 1-800-424-9153), OR GO TO HTTP://WWW.SAFERCAR.GOV.

CONNECTING ROD FAILURE/CUMMINS

NHTSA #07V311000 · Engine and Engine Cooling — Engine — Diesel · NHTSA notice

Reported July 20, 2007 · MONACO COACH CORPORATION

Potentially affected: 747 vehicles

Monaco Coach campaign R07007 · Owners notified August 7, 2007 · Vehicles built November 21, 2005 – August 9, 2006 (per NHTSA)

Defect description

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.

Safety consequence

IF ALLOWED TO PROGRESS, THIS CAN LEAD TO ENGINE FAILURE WITH THE POSSIBILITY OF THE ROD RUPTURING THE LOCK CAVITY, OIL AND DEBRIS ON THE ROADWAY AND VEHICLE CRASH.

Manufacturer 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 ENGINE DAMAGE AND RESULTANT SAFETY HAZARD. CUMMINS WILL ALSO INSTALL A NEW VALVE COVER WITH A CRANKCASE PRESSURE SENSOR FREE OF CHARGE (PLEASE SEE 07E033). OWNERS MAY CONTACT CUMMINS AT 800-343-7357 OR MONACO AT 1-800-685-6545.

Notes

MONACO RECALL NO. R07007.CUSTOMERS MAY CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION'S VEHICLE SAFETY HOTLINE AT 1-888-327-4236 (TTY: 1-800-424-9153); OR GO TO HTTP://WWW.SAFERCAR.GOV.

HEADLIGHT SWITCH OVERLOADING

NHTSA #05V366000 · Exterior Lighting — Headlights — Switch · NHTSA notice

Reported August 24, 2005 · MONACO COACH CORPORATION

Potentially affected: 451 vehicles

Monaco Coach campaign 505011 · Owners notified September 30, 2005 · Vehicles built January 21, 2005 – August 9, 2005 (per NHTSA)

Defect description

ON CERTAIN MOTOR HOMES, THE HEADLIGHT SWITCH IN THE FRONT ELECTRICAL BOX/FIREWALL CAN OVERLOAD.

Safety consequence

CHANGES IN THE COMPONENT SUPPLIER RELAY REQUIREMENTS WITH AN UPDATED CONTROLLER WERE CAUSING THE HEADLIGHTS TO STOP FUNCTIONING WITHOUT WARNING. THIS COULD POTENTIALLY CAUSE A CRASH WHILE DRIVING AT NIGHT.

Manufacturer remedy

DEALERS WILL INSTALL A NEW WIRING HARNESS. THE RECALL BEGAN ON SEPTEMBER 30, 2005. OWNERS MAY CONTACT MONACO AT 1-800-685-6545.

Notes

MONACO RECALL NO. R05011.CUSTOMERS MAYALSO CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION'S VEHICLE SAFETY HOTLINE AT 1-888-327-4236; (TTY: 1-800-424-9153); OR GO TO HTTP://WWW.SAFERCAR.GOV.

try.vin has no NCAP crash-test rating on file for the 2006 Monaco Coach Diplomat. NHTSA rates some vehicles by body style — pickups by cab, vans by roof height — so check nhtsa.gov/ratings.

4 owner complaints have been filed with NHTSA for the 2006 Monaco Coach Diplomat.

Structure

ODI #10295375

Incident: November 15, 2009 · Filed: December 11, 2009

MOTOR HOME BY MONACO BROKEN FRAME TRAILING ARMS. *TR

Engine and Engine Cooling

ODI #10228390

Incident: May 1, 2008 · Filed: May 12, 2008

OWNER OF A 2006 40' MONACO DIPLOMAT RV MOTORHOME DELIVERED WITH A 400HP DIESEL ENGINE, MANUFACTURED BY CUMMINS INC. RECEIVED A RECALL NOTICE RE A POSSIBLE ENGINE FAILURE; HE IS REQUESTING HELP IN ORDERING CUMMINS TO INSTALL A PROPER MANUFACTURED ENGINE. *KB THE CONSUMER STATED THE REMEDY THE MANUFACTURING IS SUGGESTING IS A WARNING DEVICE NOT AN ACTUAL FIX TO THE PROBLEM. THE MANUFACTURED STATED THEY WOULD INSTALL A PRESSURE SENSOR IN THE CRANKCASE ESSENTIALLY TO WARN OF A PENDING ENGINE FAILURE.*JB

Engine and Engine Cooling

ODI #10201329

Incident: July 20, 2007 · Filed: August 31, 2007

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. THE CORRECT FIX SHOULD BE A NEW ENGINE WHICH WOULD NOT HAVE THE UNCERTAINTY OF ENGINE FAILURE CAUSING THE VEHICLE (MOTORHOME ) TO BE STRANDED. *TR UPDATED 09/18/07.*JB

Engine and Engine Cooling; Fuel System, Gasoline

ODI #10200829

Incident: July 19, 2007 · Filed: August 26, 2007

WHILE TRAVELING IN MONTANA IN OUR 2006 MONACO DIPLOMAT MOTORHOME WITH THE CUMMINS ISL400 ENGINE A FUEL LEAK DEVELOPED IN THE ENGINE. THIS LEAK INVOLVED THE LINE FROM THE FUEL PUMP TO THE FUEL RAIL SPRAYING DIESEL FUEL ALL OVER THE ENGINE WHILE THE UNIT WAS RUNNING. MOTORHOME HAD TO BE TOWED 65 MILES TO BILLINGS, MT CUMMINS REPAIR FACILITY. A NEW FUEL LINE WAS INSTALLED, ALONG WITH A BRACKET WHICH IS NOW BEING INSTALLED ON THESE FAULTY LINES DUE TO THESE REPORTED FUEL LEAKS. NUMEROUS MOTORHOME OWNERS WITH THIS ENGINE HAVE REPORTED THIS POTENTIALLY DANGEROUS SITUATION TO BOTH CUMMINS AND VARIOUS COACH MANUFACTURERS. OWNERS ARE OF THE OPINION THAT A RECALL SHOULD BE ISSUED FOR THESE ENGINES DUE TO THE POTENTIAL OF A CATASTROPHIC ENGINE FIRE DUE TO THESE LEAKS. DRIVERS OF THESE UNITS WOULD NOT EVEN BE AWARE OF A FIRE ON THE COACH SINCE THE ENGINE IS AT THE REAR OF THE VEHICLE. *TR

Other Monaco Coach Diplomat model years

Check your 2006 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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