Problems · NHTSA complaints
2001 Mitsubishi Diamante problems
Owners filed 78 complaints about the 2001 Mitsubishi Diamante with NHTSA between Feb 2001 and Jan 2011. The most-cited component is visibility (56).
Complaints
78
Filed with NHTSA
Crashes
0
Reported by owners
Fires
0
Reported by owners
Injuries
6
People reported injured
Deaths
0
Reported to NHTSA
Complaints by component
One complaint can cite several components
- Visibility56
- Engine and engine cooling14
- Power train4
- Service brakes, hydraulic4
- Suspension3
- Tires3
- Equipment2
- Wheels1
- Traction control system1
- Seat belts1
- Structure1
- Vehicle speed control1
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
4
2
10
32
5
14
5
1
0
1
View as table
| Model year | Complaints filed per calendar year |
|---|---|
| 2001 | 4 |
| 2002 | 4 |
| 2003 | 2 |
| 2004 | 10 |
| 2005 | 32 |
| 2006 | 5 |
| 2007 | 14 |
| 2008 | 5 |
| 2009 | 1 |
| 2010 | 0 |
| 2011 | 1 |
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
56 reports
“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”
Engine and engine cooling
14 reports
“MY CAR IS MAKING ME SICK!! I NOTICED A SMELL OF ANTI-FREEZE COMING OUT OF THE CLIMATE CONTROL VENTS. UPON FURTHER INVESTIGATION, I NOTICED ANTI-FREEZE/ENGINE COOLANT LEAKING FROM THE HEATER CORE DOWN ONTO FLOOR MATS, CLIMATE CONTROL INTAKE, ELECTRICAL WIRING INSIDE DASHBOARD, AND MORE IMPORTANTLY AUTOMATIC TRANSMISSION COMPUTER. THIS IS A SIGNIFICANT SAFETY AND HEALTH ISSUE AND NEEDS TO BE ADDRESSED IMMEDIATELY. WHERE IS MANUFACTURER'S RECALL. *JB”
Power train
4 reports
“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 USERS I HAVE FOUND EXPERIENCE AT LEAST A FEW OF THESE CONFLICTS. ANOTHER PROBLEM I HAVE SEEN MANY COMMENTS ABOUT IS TRANSMISSION FAILURE AT 113K MILES. MY CAR HAS EXACTLY THAT. ON TOP OF EVERYTHING, IT IS WINTER, AND ANTI-LOCK BRAKES ARE MUCH PREFERRED IN ICY WEATHER. I AM STARTING TO SMELL ANTIFREEZE AGAIN, THE WARNING SIGN TO A FAILING HEATER CORE, WHICH CAN LEAK ONTO A TRANSMISSION COMPUTER AND CAUSE IT TO FAIL AS WELL. I AM BEGINNING TO WORRY ABOUT BEING STRANDED, AND EVEN BEING SAFE IN MY CAR. I KNOW I AM NOT THE ONLY ONE COMPLAINING, BECAUSE I HAVE BEEN ONLINE ALL DAY READING FORUMS FROM PEOPLE WITH SIMILAR ISSUES (SEE THE FOLLOWING: HTTP://WWW.CARSURVEY.ORG/REVIEWS/MITSUBISHI/DIAMANTE/R76426/COMMENTS/PAGE-5/). SOMETHING MUST BE DONE! *TR”
Service brakes, hydraulic
4 reports
“DISC BRAKE PADS SHOW ACCELERATED WEAR, WITH REPLACEMENT AT 5,000 AND AGAIN AT 17,000 MILES. ABNORMAL WEAR NOT DUE TO "RIDING THE BRAKES". BELIEVE ACCELERATED WEAR COULD LEAD TO PREMATURE BRAKE FAILURE CAUSING ACCIDENT AND POSSIBLE LOSS OF LIFE. MR”
Suspension
3 reports
“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 CHECKED OUT ALL THE OBVIOUS FRONT END STUFF ALONG WITH THE THREE BUSHINGS ON EACH FRONT WHEEL ASSEMBLY. FOR THE MOST PART THE CAR TRACKS STRAIGHT DOWN THE ROAD AND IS SMOOTH AND TRUE. IT MAY BE DESCRIBED AS A LITTLE SOFT IN HANDLING BUT NOTHING SEVERE UNTIL THIS SITUATION OCCURS. THE SHOCKS AND STRUTS SEEM OK. THE CAR HAS 70,000 MILES? *TR”
Tires
3 reports
“I AM FEELING A CONSTANT VIBRATION ON THE FRONT END OF CAR, AND I JUST REPLACED THE FRONT TIRES. I CHECKED TO SEE IF THE WEIGHTS ARE STILL ON THE RIM AND THEY ARE. ALL OF A SUDDEN I STARTED TO HEAR A VERY LOUD NOISE AND WHEN I PUSHED THE GAS PEDAL THE VIBRATION WOULD GET WORSE. *TR”
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.