The 2006 Holiday Rambler Neptune has 1 NHTSA recall campaign affecting an estimated 647 vehicles. Recall repairs are always free at any authorized dealer. Owners have filed 5 complaints with NHTSA, most often about the suspension. Last updated July 5, 2026.
CERTAIN MOTOR HOMES FAIL TO CONFORM TO THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 121, 'AIR BRAKE SYSTEMS.' TWO DELIVERY LINES ON THE BRAKE SYSTEM WERE INSTALLED INCORRECTLY.
THIS DOES NOT MEET THE STANDARD REQUIREMENTS.
DEALERS WILL SWITCH THE PORT HOOK-UPS OF THE TWO DELIVERY LINES ON THE AIR BRAKE SYSTEM. THE RECALL BEGAN ON AUGUST 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.
“After reading an article in the january, 2011 motorhome magazine, I discovered a crack in both trailing arms. Contacted holiday rambler/monaco and was advised they would not be responsible for replacement. In april, 2012 new trailing arms were ordered from source engineering and replaced at my…”
“On 7 september 2009 we were on the freeway near atlanta when our 2006 holiday rambler neptune started rocking from side to side and made sounds like something underneath up front was loose. We slowed down and made it to our campground and when I looked underneath I could find nothing loose up…”
“We were traveling north on highway 54 thru kingdom city mo. When we came to a stop light. Upon applying the brakes the vehicle listed violently side to side. I immediately pulled off on the shoulder of the road and inspected the vehicle but found nothing wrong. We continued northbound and I…”
“We were traveling north on highway 54 thru kingdom city mo. When we came to a stop light. Upon applying the brakes the vehicle listed violently side to side. I immediately pulled off on the shoulder of the road and inspected the vehicle but found nothing wrong. We continued northbound and I…”
“Recently purchased 2006 holiday rambler motorhome. The issue is the rear trailing arms in the chassis. Monaco,llc who was & now is again the manufacturer of the holiday rambler put an undersized trailing arm on thousands of mh ranging from 2002-2009. We bought this mh from the original owner &…”
Recall, complaint, and investigation records from official NHTSA datasets (FLAT_RCL, FLAT_CMPL, FLAT_INV), synced weekly. Counts reflect NHTSA records for the 2006 Holiday Rambler Neptune as of July 5, 2026. Complaint narratives are consumer-submitted and unverified. This page contains ads and affiliate links. Full methodology.