2001 Mitsubishi Diamante problems, complaints & recalls
Most-reported problem areas: Visibility:defroster/Defogger/Hvac System:heater Core (50) · Visibility:defroster/Defogger/Hvac System (4) · Engine And Engine Cooling:cooling System (4)
🧭 Reliability snapshot
Compared against other Mitsubishi Diamante model years — complaint volume vs the model's median year, recalls and severity. How we score →
🛣️ Complaints by mileage
57 NHTSA complaints that reported an odometer reading.
Safety recalls (0)
No recalls on record for this model year (campaigns announced since 2010).
Service bulletins (66)
Technical service bulletins are repair instructions manufacturers send dealers for known issues. Unlike recalls, the fix is not automatically free — but naming the bulletin at the service desk can save diagnosis time and support goodwill repairs.
Equipment:other:owners/Service/Other Manual 2023-07-21 · DEALER LETTER · Service Bulletin/Repair Instructions
this is a dealer letter sent to dealers informing that mitsubishi technical training has launched the 3rd quarterly technician quiz for 2023.
Structure 2023-04-24 · TSB-23-00-004 · Service Bulletin/Repair Instructions
this technical service bulletin provides instructions and material safety data sheets for removal of rap-film adhesive residue.
Equipment:other:owners/Service/Other Manual 2023-04-24 · TSB-23-00-001 · Service Bulletin/Repair Instructions
this technical service bulletin reviews the regulations that require a label showing the reduction in load carrying capacity be affixed to vehicles when the total net weight of accessories is more than 1.5 percent of the vehicle's gross vehicle weight rating (gvwr) or 100 lbs.
Equipment:other:owners/Service/Other Manual 2023-04-21 · DEALER LETTER · Service Bulletin/Repair Instructions
this is a dealer letter sent to dealers informing that mitsubishi technical training has launched the 2nd quarterly technician quiz for 2023.
Unknown Or Other 2022-04-07 · TSB-22-54-003 · Service Bulletin/Repair Instructions
this technical service bulletin was sent to dealers to explain the difference between normal dew condensation, which is a natural phenomenon, and water penetration caused by improper sealing or a defective/broken part.
Equipment 2019-11-26 · TT253 · Service Bulletin/Repair Instructions
this is a service newsletter (tech talk) that was sent out to dealers.
Showing the 6 most recent of 66 bulletins. Search all of them free at nhtsa.gov.
What owners report
2011-01-21 · Wheels · 100,000 mi“i have a 2001 mitsubishi diamante, and am having problems that seem to run rampant among this model/make. my heater core went out at about 100k miles; my abs light stays on (due to a speed sensor fail), which renders the whole anti-lock system useless; and now my antenna mast is broken. all of these problems are pricey to fix, and most diamante use…”
2009-04-09 · Visibility:defroster/Defogger/Hvac System:heater Core“windows are fogging up do t a faulty heater core. i really don't mind repairing the car seeing that it has 120k on it.. i purchased the car brand new and this will be the 3rd heater core!!! what's going on! *tr…”
2008-08-13 · Visibility:defroster/Defogger/Hvac System:heater Core · 75,000 mi“mitsubishi diamante infamous heater core problem antifreeze leaks into interior of car. horrible sickening anti freeze smell, happens on an abundance of mitsubishi cars. *tr…”
2008-04-14 · Visibility:defroster/Defogger/Hvac System:heater Core“heater core is causing the windows to fog up, the car to smell like antifreeze and may be damaging the ecu. there are hundreds of posts online about people having this problem over and over with this car. it is clearly a manufacturers defect and customers are left paying thousands of dollars fo the repair. *tr…”
2008-03-15 · Suspension:front · 63,000 mi“2001 mitsubishi diamante. we have had it about six months. i have had it in to a very reputable service station and have come up empty on the following problem. the car has new tires, this occurred before and after they were installed. during more aggressive turning the car gets very unstable, bad enough to lose control. the service shop chec…”
2008-03-14 · Visibility:defroster/Defogger/Hvac System:heater Core · 104,000 mi“heater core went bad at 105,000 miles. this seems to be a manufactoring problem and mitsubihi should adress the issue. *tr…”
2008-01-17 · Visibility:defroster/Defogger/Hvac System:heater Core“my 2001 mitsubishi diamante's heater core went up. i have massive amounts of coolant leaking on my passenger side, thick smoke coming from my vents and a bad odor coming from the vents. i have read this is a very very common thing with mitsubishi's especially diamante's. *tr…”
2007-11-27 · Visibility:defroster/Defogger/Hvac System:heater Core · 81,000 mi“just recently started having really foggy windows and started to notice sweet smell coming from car when heater/defrost was turned on. notified dealer of problem and dealer quickly identified problem as heater core defect. *tr…”
2007-11-13 · Visibility:defroster/Defogger/Hvac System:heater Core · 65,000 mi“tl*the contact owns a 2001 mitsubishi diamante. the windows fogged up when the air and heat were activated. the passengers could smell antifreeze. the dealer stated that the heater core failed due to defective o-rings. the heater core was replaced. the current and failure mileages were 65,000.…”
2007-11-13 · Visibility:defroster/Defogger/Hvac System:heater Core · 70,000 mi“tl*the contact owns a 2001 mitsubishi diamante. the windows fogged up when the air and heat were activated. the passengers could smell antifreeze. the dealer stated that the heater core failed due to defective o-rings and noticed antifreeze leaking onto the micro processor. the micro processor and heater core were replaced. the failure mileage…”
Excerpts of consumer complaints filed with NHTSA, lightly truncated. They are owner statements, not verified findings.