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2003 Mitsubishi Diamante

Owner reports · Recalls · Investigations

Similar to other model years

Owner complaints for the 2003 Mitsubishi Diamante do not stand out strongly from the model-year median of 31.5.

About this comparison →

How this year compares

Owner complaints by model year

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Counts vary with age, sales and reporting. They are not failure rates.

What owners reported most

All reported categories

Tap a category to read its complaints. One report may name several components.

When problems were reported

Mileage at the reported incident

44 reports with mileage · 12 unknown

NHTSA’s mileage field refers to the reported incident, not necessarily the filing date. This shows report counts, not the likelihood of a failure.

What to inspect

Issues worth paying extra attention to based on owner reports.

  • Visibility. Review the 28 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
  • Engine And Engine Cooling. Review the 17 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
  • Power Train. Review the 4 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →

NHTSA owner reports · September 18, 2026 snapshot.

1 crash reports0 fire reports1 injury reports

What owners actually said

56 reports
52,000 miles · Apr 10, 2006
Visibility

STEERING WHEEL BEGAN TO SHAKE AND VISIBLE FUMES BEGAN ENTERING VEHICLE THROUGH AIR VENTS. THERE WAS A STRONG STENCH OF ANTI-FREEZE. CHECK ENGINE LIGHT WAS ON AND VEHICLE BECAME HARD TO CONTROL. AFTER TAKING CAR TO LOCAL DEALERSHIP, I WAS IMMEDIATELY TOLD, EVEN BEFORE AN INSPECTION WAS DONE, THAT THE HEATER CORE ON VEHICLE HAD A …

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STEERING WHEEL BEGAN TO SHAKE AND VISIBLE FUMES BEGAN ENTERING VEHICLE THROUGH AIR VENTS. THERE WAS A STRONG STENCH OF ANTI-FREEZE. CHECK ENGINE LIGHT WAS ON AND VEHICLE BECAME HARD TO CONTROL. AFTER TAKING CAR TO LOCAL DEALERSHIP, I WAS IMMEDIATELY TOLD, EVEN BEFORE AN INSPECTION WAS DONE, THAT THE HEATER CORE ON VEHICLE HAD A SLOW LEAK THAT OVER THE COURSE OF "SEVERAL MONTHS" THAT EVENTUALLY LEAKED ON TO THE TRANSMISSION ELECTRIC BOX AND SHORTED OUT THE ENTIRE SYSTEM. IT SEEMED OBVIOUS THAT THIS WAS A FAMILIAR ISSUE WITH THIS PARTICULAR VEHICLE. I WAS ORIGINALLY GIVEN AN ESTIMATE OF $3,300, BEING THAT THE VEHICLE WAS PAST ITS WARRANTY PERIOD. AFTER SEVERAL CALLS TO OWNER OF DEALERSHIP AND DOING RESEARCH ON THIS VEHICLES COMPLAINT HISTORY, THE PRICE WAS REDUCED 3 SEPARATE TIMES, FINALLY COSTING ME $880. APPARENTLY, MITSUBISHI HEADQUARTERS PICKED UP THE COST OF THE PARTS, LEAVING ME TO PAY LABOR CHARGES. THE MECHANIC HANDLING THE REPAIR STATED THAT DUE TO "POOR DESIGN" ON THIS PARTICULAR VEHICLE, AND EVEN WITH OUR REGULAR MAINTENANCE CHECKS AT THE DEALERSHIP, THIS PROBLEM CANNOT POSSIBLY BE RECOGNIZED OR DIAGNOSED IN ITS EARLY STAGES UNTIL IT HAS CAUSED EXTENSIVE DAMAGE. NEEDLESS TO SAY, THIS WILL BE MY LAST MITSUBUSHI. *JB

NHTSA ODI #10154930

Mileage unknown · Mar 6, 2006
Visibility

MITSUBISHI 2003 DIAMANTE. DEFROSTER/DEFOGGER : HEATER CORE WINDOWS WERE NOT CLEARING PROPERLY WITH DEFROSTER. WINDOWS SEEMED TO FROST UP AND STRONG SMELL LIKE BURNING WIRES. FOUND OUT THAT ANTIFREEZE WAS LEAKING INTO THE PASSENGER SIDE OF THE CAR AND HEATER CORE AND SEALS NEED TO BE REPLACED. $900 TO REPAIR WITH 75% OF THIS…

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MITSUBISHI 2003 DIAMANTE. DEFROSTER/DEFOGGER : HEATER CORE WINDOWS WERE NOT CLEARING PROPERLY WITH DEFROSTER. WINDOWS SEEMED TO FROST UP AND STRONG SMELL LIKE BURNING WIRES. FOUND OUT THAT ANTIFREEZE WAS LEAKING INTO THE PASSENGER SIDE OF THE CAR AND HEATER CORE AND SEALS NEED TO BE REPLACED. $900 TO REPAIR WITH 75% OF THIS AMOUNT IN LABOR! APPARENTLY THIS IS A PROBLEM WITH THESE CARS SINCE 1998. THE SMELL IN THE CAR CAN'T BE GOOD FOR YOU AND I FEEL NAUSEATED AND DIZZY WHILE DRIVING. HAVE TO KEEP THE WINDOWS OPEN IN 32 DEGREE WEATHER IN ORDER TO USE THE CAR. DEALER SAYS THE SMELL WILL REMAIN FOR AT LEAST 2 WEEKS. SEEMS THE MANUFACTURER SHOULD DO SOMETHING ABOUT THIS ONGOING PROBLEM. *NM

NHTSA ODI #10152060

38,000 miles · Nov 23, 2005
Air BagsCrashInjury

AIR BAG DID NOT DEPLOY IN 55 MPH DIRECT FRONT END COLLISION. *JB

NHTSA ODI #10143534

6,000 miles · Sep 22, 2005
Service Brakes, Hydraulic

WHEN BRAKES APPLIED THE CAR SHAKES SO BAD YOU CAN'T CONTROL IT. BRAKES WERE WORKED ON BY MITSUBISHI 3 TIMES THEN REPLACED BRAKES AND THEY ARE BAD AGAIN. *JB

NHTSA ODI #10137295

15,000 miles · Aug 25, 2005
Equipment

WHEN I APPLY THE BRAKES, THE CAR SHAKES AND JERKS UNCONTROLLABLY. I HAVE HAD WORK DONE ON THE ROTORS AS WELL AS THE BRAKES. I HAVE LESS THAN 20K MILES ON THE CAR. IT IS HIGHLY UNUSUAL TO HAVE 4 WARPED ROTORS WITHOUT SOME TYPE OF MANUFACTURING DEFECT.

NHTSA ODI #10134166

Mileage unknown · Aug 2, 2005
Visibility

ABOUT A MONTH AND A HALF AGO I NOTICED AN ODD SMELL IN MY CAR. NOT REALIZING WHAT IT WAS I CONTINUED TO DRIVE MY CAR. THEN A WEEK AGO MY CAR STARTED TO OVER HEAT BECAUSE I DIDN'T HAVE ANY COOLANT. I ALSO NOTICED A FILM ON MY WINDOWS. I HAVE A MAT UNDER THE CAR AND HAVEN'T NOTICED ANYTHING LEAKING ON TO THE GROUND. MY CAR IS A 20…

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ABOUT A MONTH AND A HALF AGO I NOTICED AN ODD SMELL IN MY CAR. NOT REALIZING WHAT IT WAS I CONTINUED TO DRIVE MY CAR. THEN A WEEK AGO MY CAR STARTED TO OVER HEAT BECAUSE I DIDN'T HAVE ANY COOLANT. I ALSO NOTICED A FILM ON MY WINDOWS. I HAVE A MAT UNDER THE CAR AND HAVEN'T NOTICED ANYTHING LEAKING ON TO THE GROUND. MY CAR IS A 2003 MITSUBISHI DIAMANTE WITH 59,0000. AFTER HAVING MY CAR LOOKED AT FURTHER IT IS APPARENT MY HEATER CORE HAS FAILED. *JB

NHTSA ODI #10131147

40,000 miles · Apr 17, 2005
Electrical SystemExterior LightingLatches/locks/linkages

CAR DOORS ARE LOCKING BY THEMSELVES, THE ALARM FOR KEYS BEING LEFT IN THE IGNITION NO LONGER SOUNDS, THE AUTOMATIC UNLOCK WHEN KEYS LEFT IN THE IGNITION NO LONGER WORKS, AND THE HEADLIGHTS DO NOT TURN OFF WHEN THE CAR IS TURNED OFF AND DOOR OPENED. HAVE BEEN STRANDED SEVERAL TIMES DUE TO KEYS LOCKED IN THE CAR, AND A DEAD BATTE…

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CAR DOORS ARE LOCKING BY THEMSELVES, THE ALARM FOR KEYS BEING LEFT IN THE IGNITION NO LONGER SOUNDS, THE AUTOMATIC UNLOCK WHEN KEYS LEFT IN THE IGNITION NO LONGER WORKS, AND THE HEADLIGHTS DO NOT TURN OFF WHEN THE CAR IS TURNED OFF AND DOOR OPENED. HAVE BEEN STRANDED SEVERAL TIMES DUE TO KEYS LOCKED IN THE CAR, AND A DEAD BATTERY DUE TO HEADLIGHTS BEING LEFT ON.*AK

NHTSA ODI #10117995

Mileage unknown · Apr 17, 2005
Suspension

VEHICLE FRONT END SHIFTS BACK AND FORTH WHEN BEHIND TRACTOR TRAILERS ON HIGHWAY. SITUATION IS DANGEROUS WHEN TRACTOR TRAILER PULLS OUT IN FRONT OF ME. NOT DUE TO TAILGATING, SINCE IT IS THE WORST WHEN APPROXIMATELY 5 CAR LENGTHS ARE BETWEEN TRACTOR TRAILER AND ME. CAR IS DIFFICULT TO CONTROL DUE TO SHIFTING. FRONT END WAS CH…

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VEHICLE FRONT END SHIFTS BACK AND FORTH WHEN BEHIND TRACTOR TRAILERS ON HIGHWAY. SITUATION IS DANGEROUS WHEN TRACTOR TRAILER PULLS OUT IN FRONT OF ME. NOT DUE TO TAILGATING, SINCE IT IS THE WORST WHEN APPROXIMATELY 5 CAR LENGTHS ARE BETWEEN TRACTOR TRAILER AND ME. CAR IS DIFFICULT TO CONTROL DUE TO SHIFTING. FRONT END WAS CHECKED AND THERE ARE NO ALIGNMENT PROBLEMS, AND TIRES HAVE BEEN REPLACED. SHIFTING CONTINUES TO OCCUR EVEN WITH TRACTION CONTROL TURNED OFF. AERODYNAMICS PROBLEM OR VEHICLE STABILITY PROBLEM? ALSO OWN A 1998 DIAMANTE THAT DOES NOT HAVE THIS PROBLEM. PROBLEM HAS OCCURRED SINCE VEHICLE PURCHASE AND SEVERITY OF PROBLEM HAS REMAINED THE SAME.*AK

NHTSA ODI #10117994

30,000 miles · Mar 22, 2005
Service Brakes, HydraulicSuspension

WHEN I APPLY THE BRAKES, THE CAR SHAKES AND JERKS UNCONTROLLABLY. I HAVE HAD WORK DONE ON THE ROTORS AS WELL AS THE BRAKES. I HAVE FOUR NEW TIRES, BUT PROBLEM STILL OCCURS. I AM AFRAID THAT ONE DAY WHILE DRIVING THIS CAR THE BRAKES WILL FAIL AND CAUSE MY FAMILY AND I SERIOUS INJURY . THIS IS A 2003 MITSUBISHI DIAMANTE, AND THE …

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WHEN I APPLY THE BRAKES, THE CAR SHAKES AND JERKS UNCONTROLLABLY. I HAVE HAD WORK DONE ON THE ROTORS AS WELL AS THE BRAKES. I HAVE FOUR NEW TIRES, BUT PROBLEM STILL OCCURS. I AM AFRAID THAT ONE DAY WHILE DRIVING THIS CAR THE BRAKES WILL FAIL AND CAUSE MY FAMILY AND I SERIOUS INJURY . THIS IS A 2003 MITSUBISHI DIAMANTE, AND THE INCIDENTS HAVE OCCURRED DAILY 3 MONTHS AFTER I PURCHASED THE VEHICLE.*AK

NHTSA ODI #10114500

47,773 miles · Feb 10, 2005
Visibility

VEHICLE EXPERIENCED A PROBLEM WITH THE HEATER COIL. ANTI-FREEZE WAS GETTING INTO VENT, AND THE VAPORS FOGGED UP THE WINDOWS, INTERRUPTING THE VISIBILITY. OWNER CONTACTED THE MANUFACTURER, WHO REFUSED ASSISTANCE BECAUSE THE VEHICLE WAS OUT OF WARRANTY. *AK

NHTSA ODI #10111321

Official recalls

2

04V428000 · Equipment:other:labels

Sep 1, 2004

CERTAIN PASSENGER VEHICLES FAIL TO CONFORM TO THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 208, 'OCCUPANT CRASH PROTECTION.' THE BILINGUAL ENGLISH/SPANISH REMOVABLE AIR BAG WARNING LABELS AFFIXED TO THE DASH AND TO THE SUNVISOR DO NOT MEET THE SIZE REQUIREMENTS OF THE STANDARD.

Consequence & remedy

Consequence: THIS DOES NOT MEET THE REQUIREMENTS OF THE STANDARD.

Remedy: MITSUBISHI CARIBBEAN WILL MAIL A CUSTOMER NOTIFICATION LETTER CONTAINING A WRITTEN DESCRIPTION AND A GRAPHIC OF THE BI-LINGUAL DASHBOARD AIR BAG WARNING LABEL. IN ADDITION, ALL CURRENT 2000-2004 NATIVA OWNERS WILL ALSO RECEIVE REPLACEMENT AIR BAG ALERT LABELS FOR THE SUN VISORS. THIS RECALL IS EXPECTED TO BEGIN DURING MARCH OR APRIL 2005. THE NOTIFICATION TO THE NATIVA OWNERS IS EXPECTED TO BEGIN DURING APRIL OR MAY 2005. OWNERS SHOULD CONTACT MITSUBISHI CARIBBEAN AT 1-787-251-8715.

04V067000 · Equipment:other:owners/service/other Manual

Feb 11, 2004

CERTAIN SPORT UTILITY AND PASSENGER VEHICLES FAIL TO COMPLY WITH FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 225, "CHILD RESTRAINT ANCHORAGE SYSTEMS." THE OWNER'S MANUAL DOES NOT CONTAIN A STEP-BY-STEP DESCRIPTION FOR HEADREST ADJUSTMENT WHEN INSTALLING A CHILD RESTRAINT SYSTEM (CRS) TETHER STRAP.

Consequence & remedy

Consequence: IF THE TETHER STRAP IS IMPROPERLY INSTALLED TO THE TETHER ANCHOR, THE CHILD SAFETY SEAT MAY NOT BE SUFFICIENT RESTRAINED. IN THE EVENT OF A CRASH, THE CHILD COULD BE INJURED.

Remedy: A LETTER OUTLINING THE PROBLEM WILL BE SENT TO OWNERS ALONG WITH A STICKER CONTAINING THE CORRECT INSTRUCTIONS AS WELL AS INSTRUCTIONS ON WHERE TO AFFIX THE STICKER IN THE OWNER'S MANUAL. THE RECALL BEGAN ON MARCH 29, 2004. OWNERS SHOULD CONTACT MITSUBISHI AT 1-888-648-7820.

Model-level recall history does not show whether a particular VIN is affected or has received a repair. Check a VIN with NHTSA ↗

NHTSA investigations

0

No exact-year investigations in this snapshot.