2001 Mitsubishi DIAMANTE problems and owner complaints
Explore the records behind recurring owner reports.
Key facts
78 owner complaints analyzed
2 distinct recall campaigns
59,750 mi median reported failure mileage
Scope: 2001 model year. Data snapshot: . 57 complaints include usable failure mileage.
Most common problems
Visibility:Defroster/Defogger/Hvac System:Heater Core is the most frequently named component, appearing in 51 of 78 complaints (65.4%). A complaint can name multiple components.
| Topic | Matching reports | Share of complaints |
|---|---|---|
| Transmission and shifting | 7 | 9.0% |
| Braking behavior | 5 | 6.4% |
| Electrical and battery issues | 4 | 5.1% |
| Steering behavior | 2 | 2.6% |
| Engine operation | 1 | 1.3% |
Topic matches use published keyword rules. They describe mentions, including negations or comparisons, and do not confirm a diagnosis. Read the matching rules.
Component breakdown
Number of unique complaints naming each component. Top eight shown.
| Category | Count |
|---|---|
| Visibility:Defroster/Defogger/Hvac System:Heater Core | 51 |
| Engine And Engine Cooling:Cooling System | 6 |
| Engine And Engine Cooling | 5 |
| Visibility:Defroster/Defogger/Hvac System | 4 |
| Power Train:Automatic Transmission:Control Module (Tcm/Pcm/Tecm) | 3 |
| Suspension:Front | 3 |
| Tires | 3 |
| Service Brakes, Hydraulic:Foundation Components:Disc:Rotor | 2 |
Visibility:Defroster/Defogger/Hvac System:Heater Core: 51; Engine And Engine Cooling:Cooling System: 6; Engine And Engine Cooling: 5; Visibility:Defroster/Defogger/Hvac System: 4; Power Train:Automatic Transmission:Control Module (Tcm/Pcm/Tecm): 3; Suspension:Front: 3; Tires: 3; Service Brakes, Hydraulic:Foundation Components:Disc:Rotor: 2
Reported problems by failure mileage
Complaint counts in mileage bands. These are not failure rates per vehicle or mile.
| Category | Count |
|---|---|
| Under 25,000 | 2 |
| 25,000 to 49,999 | 19 |
| 50,000 to 74,999 | 21 |
| 75,000 to 99,999 | 11 |
| 100,000 to 149,999 | 4 |
| 150,000 and above | 0 |
Under 25,000: 2; 25,000 to 49,999: 19; 50,000 to 74,999: 21; 75,000 to 99,999: 11; 100,000 to 149,999: 4; 150,000 and above: 0
50,000 to 74,999 miles has the most reports with usable mileage (21). 21 complaints have missing, zero or invalid mileage.
Complaints over time
Year the complaint was filed, not the vehicle model year or incident year. The snapshot year is partial.
| Category | Count |
|---|---|
| 2001 | 4 |
| 2002 | 4 |
| 2003 | 2 |
| 2004 | 10 |
| 2005 | 32 |
| 2006 | 5 |
| 2007 | 14 |
| 2008 | 5 |
| 2009 | 1 |
| 2011 | 1 |
2001: 4; 2002: 4; 2003: 2; 2004: 10; 2005: 32; 2006: 5; 2007: 14; 2008: 5; 2009: 1; 2011: 1
Pattern summary
Visibility:Defroster/Defogger/Hvac System:Heater Core leads the component reports. Transmission and shifting appears in 7 complaint narratives. Braking behavior appears in 5 complaint narratives. Electrical and battery issues appears in 4 complaint narratives. Use these patterns to inspect individual reports and prepare questions for a mechanic.
Calculated from recorded counts. An AI narrative has not been published for this selection.
Complaint evidence
Examples provide context, not a representative sample or a verified diagnosis.
Owner report 10091335 · 2004-09-20 (September 20, 2004)
1) SMELLED ANTIFREEZE BUT COULD NOT FIND A SOURCE. 2) HEATER COIL WAS LEAKING. 3) LEAKED ON A COMPUTER THAT CONTROLLED MY TRANSMISSION. WHY WOULD ANYONE PLACE AN ELECTRICAL PART UNDER A UNIT THAT HOLD A LIQUID? WHY WOULD THE ELECTRICAL PART NOT ENCASED IN A PROTECTIVE WRAP IF IT HAD TO BE PLACED NEXT TO A PRESSURIZED LIQUID CARRING COIL? 4) I WAS CHARGED $1,125.00 TO FIX A PROBLEM CAUSED BY SORRY ENGINEERING. I LEARNED THAT MISUBISHI KNEW OF THE PROBLEM AND NEVER NOTIFIED THEIR CUSTOMERS. THERE SHOULD BE A RECALL AND MITSUBISHI SHOULD H…
Owner-reported narrative. 71,300 miles reported. Look up ODI 10091335 at NHTSA ↗
Owner report 10106016 · 2005-01-09 (January 9, 2005)
I PURCHASED A USED MITSUBISHI DIAMANTE IN OCTOBER 2003 WITH 52,000 MILES ON IT. A COUPLE OF MONTHS LATER THERE WAS A STRONG ODOR COMING FROM THE VENTS AND THE WINDOW STARTED FOGGING UP. THE TRANSMISSION STARTED ACTING STRANGE SO I TOOK IT BACK TO THE DEALER AND WAS TOLD THAT THE HEATER CORE WAS LEAKING AND HAD LEAKED ON THE TRANSMISSIONS COMPUTER. THEY TOLD ME THEY COULD REPLACE THE TRANSMISSION COMPUTER UNDER WARRANTY BUT THE HEATER CORE WAS NOT COVERED AND IT WOULD COST ME ABOUT $668. I HAD TO COME UP WITH THE MONEY TO GET THE HEATER CORE…
Owner-reported narrative. 77,178 miles reported. Look up ODI 10106016 at NHTSA ↗
Owner report 10378164 · 2011-01-21 (January 21, 2011)
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 I…
Owner-reported narrative. 100,000 miles reported. Look up ODI 10378164 at NHTSA ↗
Owner report 756007 · 2001-12-25 (December 25, 2001)
THE MANUFACTURER AND THE DEALER STATE THAT IT IS NORMAL WEAR AND TEAR TO HAVE TO REPLACE AND OR TURN ROTORS EVERY 18000 TO 20000 ON THIER CARS EVEN THOUGH THE BRAKES HAVE NOT FAILED. *AK
Owner-reported narrative. Look up ODI 756007 at NHTSA ↗
Owner report 10126617 · 2005-06-26 (June 26, 2005)
NOTICED A SMELL OF ANTIFREEZE COMMING OUT OF THE CLIMATE CONTROL VENTS. UPON FURTHER INVESTIGATION, I NOTICED ANTIFREEZE/ENGINE COOLANT LEAKING FROM THE HEATER CORE DOWN ONTO FLOOR MATTS, 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.
Owner-reported narrative. 54,300 miles reported. Look up ODI 10126617 at NHTSA ↗
Owner report 10060836 · 2004-03-09 (March 9, 2004)
MY HEATER CORE WENT ON MY AUTOMOBILE. THE CAR IS A 2001 MITSUBISHI DIAMANTE WHICH HAS 50,000 MILES ON IT. THE PROBLEM STARTED WHEN THE CAR HAD 45,000 MILES ON IT, BUT I DIDN'T KNOW IT WAS THE HEATER CORE UNTIL LATER ON. THE DEALER HAD THE CAR FOR 2-L/2 DAYS FOR A JOB THAT WAS 6.9 HOURS. I WAS TOLD THAT THE BOX THAT THE CORE WAS IN WAS EITHER BROKEN OR COULDN'T BE SHUT, BUT THEN THEY WERE ABLE TO CLOSE IT, FIX IT I HOPE. I WAS TOLD BY ANOTHER MECHANIC THAT IT COULD HAVE BEEN THE O-RING AND THAT THEY HAD A CAR THE SAME YEAR WITH THE SAME PROBL…
Owner-reported narrative. 45,000 miles reported. Look up ODI 10060836 at NHTSA ↗
Owner report 8009337 · 2002-05-07 (May 7, 2002)
FRONT END ALIGNMENT IS OFF, CAUSING TIRES TO CUP/ MAKING STEERING VIBRATE, AND LOUD NOISES. REPLACED PARTS, PROBLEM STILL OCCURRING. *AK
Owner-reported narrative. Look up ODI 8009337 at NHTSA ↗
Owner report 10090068 · 2004-08-30 (August 30, 2004)
WHILE DRIVING VEHICLE STALLED. CONSUMER WAS UNABLE TO RESTART VEHICLE, AND HAD IT TOWED TO THE DEALER FOR INSPECTION. MECHANIC DETERMINED THAT THE PULLEY BELT SHEARED OFF. THIS CAUSED THE VEHICLE NOT TO START. THE MECHANIC WILL REPLACE THE PART. *AK *TC
Owner-reported narrative. 60,600 miles reported. Look up ODI 10090068 at NHTSA ↗