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2004 Monaco Coach Diplomat Recalls & Complaints

1

open safety recall on record

Critical

10 owner complaints filed · Severity Index 0.00 · updated 2026-08-07

The recalls

Critical04V441000

Engine And Engine Cooling:Engine:Diesel

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

Remedy & full details

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.

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

Complaint volume

10 this model-year 6 median, same year

Volume alone is not a fault rate — popular vehicles attract more reports. Read it next to the severity mix below.

What owners reported happened

0Crashes
0Fires
0Injuries
0Deaths

Across 10 complaints. Severity Index 0.00.

Severity Index weights each complaint's reported outcome (death ×10, injury ×4, fire ×3, crash ×2) and divides by total complaints. It measures how severe reports are, not how often faults occur.

What owners report most

Visibility · Defroster/De…2 · 20%Structure2 · 20%Service Brakes, Hydraulic2 · 20%Electrical System2 · 20%Seats · Front Assembly · …1 · 10%Equipment1 · 10%
  1. Visibility:Defroster/Defogger/Hvac System:Heater Core — 2 reports
  2. Structure — 2 reports
  3. Service Brakes, Hydraulic — 2 reports
  4. Electrical System — 2 reports
  5. Seats:Front Assembly:Recliner — 1 reports
  6. Equipment — 1 reports

What to do

  1. Find your 17-character VIN on the driver's door jamb or the base of the windscreen.
  2. Check it against NHTSA's official lookup at nhtsa.gov/recalls — the authoritative record for your exact car.
  3. Book the repair with any franchised dealer. Safety recall work is free, with no time limit and regardless of who owns the car now.

Other model years

1998 (3) · 1999 (3) · 2000 (2) · 2001 (4) · 2002 (1) · 2004 · 2005 (2) · 2006 (3) · 2007 (3) · 2008 (2) · 2009 (1) · 2010 (5) · 2011 (4)

Numbers in brackets are open recall campaigns for that year.

Questions

Does an open recall mean the car is unsafe to drive?

Not usually. NHTSA issues a "do not drive" or "park outside" advisory when a defect is dangerous enough to keep you out of the car — those are flagged Critical above. Everything else should be repaired promptly but is not an immediate stop-driving order.

Do I pay for recall repairs?

No. Federal law requires the manufacturer to fix a safety recall free of charge, including parts and labour, whether or not you are the original owner.

Why are there complaints but no recalls?

Complaints are unverified reports filed by owners. They can prompt an investigation, but many never become recalls — either the fault isn't safety-related or it isn't widespread.

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