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2013 Monaco Diplomat

Owner reports · Recalls · Investigations

Limited comparison data

There is not enough comparable history to draw a useful model-year comparison.

About this comparison →
1Owner complaints

Model-year median: 0

2Recall campaigns

View recall details →

0Investigations

View investigation details →

How this year compares

Owner complaints by model year

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Counts vary with age, sales and reporting. They are not failure rates.

What owners reported most

Engine
1

Tap a category to read its complaints. One report may name several components.

When problems were reported

Mileage at the reported incident

Limited mileage data: 1 of 1 reports include usable mileage. There isn’t enough coverage to show a useful chart.

NHTSA’s mileage field refers to the reported incident, not necessarily the filing date. This shows report counts, not the likelihood of a failure.

What to inspect

Issues worth paying extra attention to based on owner reports.

  • Engine. Review the 1 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →

NHTSA owner reports · September 18, 2026 snapshot.

0 crash reports0 fire reports0 injury reports

What owners actually said

1 reports
3,500 miles · Sep 24, 2014
Engine

I WAS DRIVING UP A MOUNTAIN WHEN A LOUD BANG OCCURRED. ENGINE LOST POWER AND COULD NOT CLIMB HILL/MOUNTAIN. LARGE AMOUNTS OF BLACK AND WHITE SMOKE CAME FROM THE REAR OF THE COACH. I WAS STUCK ON THE SIDE OF THE MOUNTAIN FOR 14 HOURS BEFORE SOMEONE COULD GET TO US. THIS IS THE SECOND TIME THIS ISSUE HAS OCCURRED AND IS ASSOCIATED…

Read full complaint

I WAS DRIVING UP A MOUNTAIN WHEN A LOUD BANG OCCURRED. ENGINE LOST POWER AND COULD NOT CLIMB HILL/MOUNTAIN. LARGE AMOUNTS OF BLACK AND WHITE SMOKE CAME FROM THE REAR OF THE COACH. I WAS STUCK ON THE SIDE OF THE MOUNTAIN FOR 14 HOURS BEFORE SOMEONE COULD GET TO US. THIS IS THE SECOND TIME THIS ISSUE HAS OCCURRED AND IS ASSOCIATED WITH THE DPF MIL LAMP COMING ON. *TR

NHTSA ODI #10638598

Official recalls

2

15V872000 · Equipment:recreational Vehicle/trailer

Dec 23, 2015

Allied Recreation Group, Inc. (ARG) is recalling certain model year 2010-2011 Holiday Rambler Admiral, 2009-2014 Holiday Rambler Ambassador, 2010 Holiday Rambler Arista, 2010-2014 Holiday Rambler Endeavor, 2009-2011 Holiday Rambler Neptune, 2011-2014 Holiday Rambler Vacationer, 2009-2011 Monaco Cayman, 2010-2014 Monaco Diplomat, 2014 Monaco Dynasty, 2009-2014 Monaco Knight, 2012-2013 Monaco LaPalma, 2009-2013 Monaco Monarch, 2009-2011 Monaco Riptide, 2008 Safari Passage, and 2008 Safari Simba motorhomes. The affected vehicles are equipped with certain Lippert-brand Coachstep Double Electric Steps. These steps use a bolt to attach the fan gear assembly to the steps. This bolt may fracture allowing the fan gear to disengage from the steps. As a result, the steps may not remain in the expected position and may be unstable.

Consequence & remedy

Consequence: Unstable entry and exit steps increase the risk of injury.

Remedy: ARG will notify owners and dealers will install a retainer bracket to reinforce the operating mechanism, free of charge. The recall began on February 12, 2016. Owners may contact ARG customer service number at 1-800-509-3417. ARG's number for this recall is 151216REV.

13V020000 · Electrical System; Engine And Engine Cooling

Jan 17, 2013

Navistar is recalling certain model year 2012-2013 IC Bus brand model 1300FBC, CE, HC, and RE buses; model year 2011-2013 International brand model Durastar, model year 2013 International brand Workstar trucks; model year 2013 Holiday Rambler brand model Ambassador and Endeavor vehicles; and model year 2013 Monaco brand model Diplomat and Knight vehicles. These vehicles were manufactured August 5, 2010 through September 6, 2012 and are equipped with certain 2011-2013 model year I-6 engines with feature codes 12NUK, 12NUL, 12NUM, 12NUN, 12NUP, 12NUR, 12NUS, 12NUT, 12NUU, 12NUV, 12NUX, 12NUY and 12NUZ. The injection pressure regulator (IPR) harness wire may break due to vibrational damage. This could cause an unexpected shut down of the engine.

Consequence & remedy

Consequence: An unexpected engine shut down while driving may increase the risk of a vehicle crash.

Remedy: Navistar will notify owners, and dealers will replace the IPR wire connector free of charge. The safety recall began on March 15, 2013. Owners may contact Navistar at 1-800-448-7825.

Additional source detail variants (2)

Electrical System

Navistar is recalling certain model year 2012-2013 IC Bus brand model 1300FBC, CE, HC, and RE buses; model year 2011-2013 International brand model Durastar, model year 2013 International brand Workstar trucks; model year 2013 Holiday Rambler brand model Ambassador and Endeavor vehicles; and model year 2013 Monaco brand model Diplomat and Knight vehicles. These vehicles were manufactured August 5, 2010 through September 6, 2012 and are equipped with certain 2011-2013 model year I-6 engines with feature codes 12NUK, 12NUL, 12NUM, 12NUN, 12NUP, 12NUR, 12NUS, 12NUT, 12NUU, 12NUV, 12NUX, 12NUY and 12NUZ. The injection pressure regulator (IPR) harness wire may break due to vibrational damage. This could cause an unexpected shut down of the engine.

Consequence: An unexpected engine shut down while driving may increase the risk of a vehicle crash.

Remedy: Navistar will notify owners, and dealers will replace the IPR wire connector free of charge. The safety recall began on March 15, 2013. Owners may contact Navistar at 1-800-448-7825.

Engine And Engine Cooling

Navistar is recalling certain model year 2012-2013 IC Bus brand model 1300FBC, CE, HC, and RE buses; model year 2011-2013 International brand model Durastar, model year 2013 International brand Workstar trucks; model year 2013 Holiday Rambler brand model Ambassador and Endeavor vehicles; and model year 2013 Monaco brand model Diplomat and Knight vehicles. These vehicles were manufactured August 5, 2010 through September 6, 2012 and are equipped with certain 2011-2013 model year I-6 engines with feature codes 12NUK, 12NUL, 12NUM, 12NUN, 12NUP, 12NUR, 12NUS, 12NUT, 12NUU, 12NUV, 12NUX, 12NUY and 12NUZ. The injection pressure regulator (IPR) harness wire may break due to vibrational damage. This could cause an unexpected shut down of the engine.

Consequence: An unexpected engine shut down while driving may increase the risk of a vehicle crash.

Remedy: Navistar will notify owners, and dealers will replace the IPR wire connector free of charge. The safety recall began on March 15, 2013. Owners may contact Navistar at 1-800-448-7825.

Model-level recall history does not show whether a particular VIN is affected or has received a repair. Check a VIN with NHTSA ↗

NHTSA investigations

0

No exact-year investigations in this snapshot.