AI Damage2000 Mitsubishi Diamante: common problems
Owners of the 2000 Mitsubishi Diamante filed 51 complaints with NHTSA, most often about visibility and engine and cooling. Details by component below, with sources.
Key figures
- Owner complaints
- 51
- involving a crash
- 3
What fails most often
- 1 Visibility 53% of all complaints
- 2 Engine and cooling 14% of all complaints
- 3 Service brakes 8% of all complaints
- 4 Fuel system 6% of all complaints
- 5 Powertrain 6% of all complaints
- 6 Vehicle speed control 6% of all complaints
- 7 Air bags 4% of all complaints
- 8 Electrical system 4% of all complaints
- Visibility: 27 complaints (53% of all).
- Engine and cooling: 7 complaints (14% of all), 1 of them with a crash reported by the owner.
- Service brakes: 4 complaints (8% of all).
- Fuel system: 3 complaints (6% of all).
- Powertrain: 3 complaints (6% of all).
Engines and transmissions
US-market versions per EPA. On the right: how many NHTSA complaints name this engine or transmission type.
- 3.5 L · petrol · 6 cyl
- automatic, 4-speed
Drive: FWD
Symptoms owners describe
How many of the 51 NHTSA complaints mention each symptom (automatic count from complaint text; one complaint can mention several).
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Visibility | 27 | 0 | 0 |
| Engine and cooling | 7 | 1 | 0 |
| Service brakes | 4 | 0 | 0 |
| Fuel system | 3 | 0 | 0 |
| Powertrain | 3 | 0 | 0 |
| Vehicle speed control | 3 | 0 | 0 |
| Air bags | 2 | 2 | 0 |
| Electrical system | 2 | 0 | 0 |
| Latches, locks, linkages | 1 | 0 | 0 |
| Steering | 1 | 0 | 0 |
| Structure | 1 | 0 | 0 |
| Suspension | 1 | 0 | 0 |
| Tires | 1 | 0 | 0 |
| Other | 2 | 0 | 0 |
What owners report
Short excerpts of NHTSA complaints in the original wording. These are owner statements not verified by NHTSA; personal data removed.
The fumes of antifreeze fogged up the windows severely, reducing visibility of the driver. It was raining one night and my windows all of a sudden got foggy. I turned on the defroster, which made my windows even foggier. The poor visibility caused me to run off the road into the grassy median.
Vehicle involved in a head on collision at 30 mph, vehicle that impacted my vehicle was travelling at 25 mph. The entire front of car including bumper was destroyed by the 55 mph impact. Neither airbag deployed. The driver airbag appears to have begun to deploy, but did not.
Driver rear ended another vehicle at 30 to 35mph, and neither driver's side nor passenger's side airbags deployed. Dealer has not seen vehicle.
Consumer states vehicle surged forward. The consumer stated when leaving a parking lot and attempting to pull into traffic, the vehicle barely moved at 5 mph, even though he was pressing on the accelerator and the rpm was not moving.
So I press down further on the gas pedal, and suddenly the car lurches forward out of control. So then I have to immediately take my foot off the gas pedal and brake slightly until the car goes the right speed.
When our windows would fog, our defroster wouldn't work. Then our passenger side floor was soaked with antifreeze. We took the car to the dealer, our heater core was leaking. Cost was $1300 to repair. Mitsubishi should be held responsible!! Too many complaints.
For over 2 years now I have had problems with an odor in my 2000 diamanti and the defogger never seemed to work on the windows. A couple of weeks ago I saw something leak onto the passenger side rug but didn't' t guess that this could have something to do with the heater core.
Heating core is leaking antifreeze onto other components under the dash; strong smell of antifreeze within the car; windows fog up upon using any of the ventilation systems.
When owners complained
NHTSA complaints by filing year. The peak shows at what age the problems show up most.
Comparison
By complaint count this model year ranks 5,293 of 36,656 model years in the NHTSA data (top 14% most complained about).
On average one model year of the Diamante has 42 complaints (12 years in the data). This year has 51, above average.
What to check before buying
- Visibility. Wipers, mirrors, defrosters, cracked glass.
- Engine and cooling. Radiator and fan after a frontal hit, coolant level and condition, overheating.
- Service brakes. Pedal feel, ABS operation, leaks, discs and hoses.
- Fuel system. Fuel smell, leaks, rough running, fuel-system codes.
Other years of this model
Questions and answers
What are the most common problems with the 2000 Mitsubishi Diamante?
Owner complaints to NHTSA most often mention: visibility, engine and cooling, service brakes. Total complaints: 51. The most frequent symptoms in complaint texts: A/C or heater (43%), windows, sunroof (29%), smoke, burning smell, fire (12%).
How many service bulletins (TSB) were issued for the 2000 Mitsubishi Diamante?
NHTSA lists 0 manufacturer service bulletins for this year. A bulletin tells dealers how to diagnose or fix a known issue; it is not a recall.
Should I buy a 2000 Mitsubishi Diamante from a US auction?
Owner complaints describe defects, not crash damage. Before bidding, check the components listed above and review the lot photos: VinWind builds a report of visible and hidden damage by VIN.
Other 2000 models
Read also
Sources: public NHTSA data (USA): service bulletins and owner complaints; YouTube: links to videos credited to their authors. Complaints are owner statements not verified by NHTSA, and describe defects rather than crash damage. Data updated 2026-11-05.