Problems · NHTSA complaints
2000 Mitsubishi Diamante problems
Owners filed 51 complaints about the 2000 Mitsubishi Diamante with NHTSA between Jun 2000 and Apr 2010. The most-cited component is visibility (27).
Complaints
51
Filed with NHTSA
Crashes
3
Reported by owners
Fires
0
Reported by owners
Injuries
7
People reported injured
Deaths
0
Reported to NHTSA
Complaints by component
One complaint can cite several components
- Visibility27
- Engine and engine cooling7
- Vehicle speed control3
- Power train3
- Fuel system, gasoline3
- Service brakes, hydraulic3
- Air bags2
- Electrical system2
- Structure1
- Service brakes, air1
- Latches/locks/linkages1
- Steering1
- Suspension1
- Tires1
Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.
Data from NHTSA Complaints API · synced Oct 28, 2026NHTSA vehicle page
When complaints were filed
Does it get worse with age? Complaints per calendar year filed
4
8
4
8
12
9
0
3
1
0
2
View as table
| Model year | Complaints filed per calendar year |
|---|---|
| 2000 | 4 |
| 2001 | 8 |
| 2002 | 4 |
| 2003 | 8 |
| 2004 | 12 |
| 2005 | 9 |
| 2006 | 0 |
| 2007 | 3 |
| 2008 | 1 |
| 2009 | 0 |
| 2010 | 2 |
Mileage at failure isn’t a structured field in NHTSA complaint data, so we don’t chart it. Some owners mention it in their reports below.
Top problems in owners’ words
Verbatim from NHTSA complaints, newest first
Visibility
27 reports
“MY WIFE AND I NOTICED ANTIFREEZE ODOR COMING IN THROUGH VENTS. 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. *TR”
Engine and engine cooling
7 reports1 crash
“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. I WAS OUT OF TOWN WHEN THIS OCCURRED. IN DOING RESEARCH ON THIS PROBLEM I FOUND THAT IT WAS COMMON ALL DIAMANTES (92 -2001). IN MANY CASES, THE DRIVER IS NOT AWARE THAT THIS IS A SEVERE PROBLEM. THE ANTIFREEZE WILL STARTED LEAKING ON THE PASSENGER?S SIDE AREA. CAUSING MORE STRONG SMELL OF TOXIC ANTIFREEZE. I BELIEVE THIS TO BE A SAFETY ISSUE. *AK”
Vehicle speed control
3 reports
“2000 MITSUBISHI DIAMANTE. CONSUMER STATES VEHICLE SURGED FORWARD. *TGW 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. AFTER GOING ABOUT 1/4 OF A MILE, ALL OF A SUDDEN THE VEHICLE JUMPED INTO GEAR AND THE VEHICLE LURCHED FORWARD. THE NEXT DAY, A REPRESENTATIVE FROM MITSUBISHI WENT TO THE CONSUMER'S WORKPLACE AND EXAMINED THE VEHICLE. THE REPRESENTATIVE STATED THE THROTTLE CABLE NEEDED TO BE ADJUSTED AND SUGGESTED THE CONSUMER TAKE THE VEHICLE TO THE DEALER. THE CONSUMER STATED THE DEALER NEVER RECEIVED ANY INFORMATION TO ORDER A NEW CABLE AND THE HIS VEHICLE STILL HAS NOT BEEN FIXED. *JB”
Power train
3 reports
“VEHICLE CHECK ENGINE LIGHT CAME ON AND LOCKED INTO THIRD GEAR. NOTICED SMELL OF COOLANT INSIDE DRIVERS COMPARTMENT AND HAZING OF THE WINDSHIELD. BROUGHT VEHICLE TO DEALER TO HAVE PROBLEM IMPROPERLY DIAGNOSED AND HAD TO HAVE IT RE-TESTED TWO WEEKS LATER. HEATER CORE LEAKAGE HAS CAUSED DAMAGE TO THE ECU AND NOW BOTH HAVE TO BE REPLACED. TOTAL COST OF REPAIR FOR BOTH WAS $3,357.62. COOLANT FUMES ARE VERY TOXIC AND CAUSE A SIGNIFICANT HEALTH RISK AND ECU FAILURE COULD EASILY RESULT IN A VERY SERIOUS ACCIDENT ON THE HIGHWAY OR ELSEWHERE. THE "FOGGING" OF THE WINDSHIELD IS A VISIBILITY HAZARD AS WELL CAUSED BY THE HOT COOLANT IN THE DEFROST VENTS. *JB”
Fuel system, gasoline
3 reports
“DT: CONSUMER HAS 2000 MITSUBISHI DIAMANTE WHOSE GAS TANK LEAKS CONSUMER TOOK VEHICLE TO DEALER, AND DEALER FOUND GAS LEAKAGE, BUT COULD NOT FIND ANY HOLE IN THE GAS TANK. *AK”
Service brakes, hydraulic
3 reports
“WE HAVE A 2000 MITSUBISHI DIAMANTE WITH 32K MILES ON IT. CAR IS STILL UNDER FACTORY WARRANTY ALONG WITH AN EXTENDED WARRANTY WE HAVE PURCHASED. AFTER THE FIRST COUPLE OF THOUSAND MILES WE NOTICED A "PULSING" FEELING IN THE BRAKES AS WELL AS AN INTERMITTENT ABS WARNING LIGHT FLASH. WE MADE THE DEALER AWARE OF THIS SO THEY REPLACED ALL 4 AT APPROX. 11K. LESS THAN 10K AFTER THAT WE NOTICED THE SAME PROBLEM AND TOOK IT INTO A CLOSER DEALER TO WHERE WE LIVE, THEY REPLACED THE BRAKES AGAIN. NOW AGAIN ABOUT 10K THE BRAKES ARE HAVING THE SAME PROBLEM. THE VEHICLE ABS LIGHT CAME ON A COUPLE OF TIMES AND THE CAR IS ?PULSING? WHEN APPLYING THE BRAKES AND IS WORN OUT AGAIN. I SPOKE TO MITSUBISHI CUSTOMER SERVICE AGENT WHO IS THE DEALER REP. DEBBIE KRUMBOLTZ. SHE ORIGINALLY AGREED TO TAKE CARE OF THE BRAKES AFTER I MET WITH HER ABOUT THE ISSUE. WHEN I MADE THE APPOINTMENT TO HAVE THE REPAIR DONE SHE DENIED AGREEING TO THE REPAIR? I IN TURN CALLED MITSUBISHI MOTORS AND SPOKE TO A PERSON IN THE ESCALATED COMPLIANT DIVISION NAMED LISA, SHE WOULD NOT GIVE HER LAST NAME AND BASICALLY TOLD ME THAT THE CASE IS CLOSED AND MITSUBISHI IS NOT GOING TO DO ANYTHING ABOUT IT. I…”
Data from NHTSA Complaints API (owner reports, unverified) · synced Oct 28, 2026
Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.