The 2006 Monaco Coach Diplomat has 3 NHTSA recall campaigns affecting an estimated 2,931 vehicles. Recall repairs are always free at any authorized dealer. Owners have filed 5 complaints with NHTSA, most often about the engine and engine cooling. Last updated July 5, 2026.
Recall campaigns
VISIBILITY08V0700002008-02-141,733 affected
Defect
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.
Consequence
WHEN THE WIPER SYSTEM FAILS, THE OPERATOR WILL HAVE REDUCED VISIBILITY WHICH COULD RESULT IN A CRASH.
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.
ENGINE AND ENGINE COOLING07V3110002007-07-20747 affected
Defect
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.
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.
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…
EXTERIOR LIGHTING05V3660002005-08-24451 affected
Defect
ON CERTAIN MOTOR HOMES, THE HEADLIGHT SWITCH IN THE FRONT ELECTRICAL BOX/FIREWALL CAN OVERLOAD.
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.
Remedy
DEALERS WILL INSTALL A NEW WIRING HARNESS. THE RECALL BEGAN ON SEPTEMBER 30, 2005. OWNERS MAY CONTACT MONACO AT 1-800-685-6545.
Verbatim reports filed with NHTSA, lightly edited for readability and with personal
information removed.
“Motor home by monaco broken frame trailing arms. *tr”
“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…”
“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…”
“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…”
“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…”
Recall, complaint, and investigation records from official NHTSA datasets (FLAT_RCL,
FLAT_CMPL, FLAT_INV), synced weekly. Counts reflect NHTSA records for the 2006 Monaco Coach Diplomat as of
July 5, 2026. Complaint narratives are consumer-submitted and unverified. This page
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