2001 Mitsubishi Diamante problems & reliability
78 owner complaints filed with NHTSA for the 2001 Mitsubishi Diamante, alongside 2 safety recall campaigns. Last verified Aug 7, 2026. Complaints are unverified reports submitted by owners to the federal Office of Defects Investigation.
Each complaint is counted once (by NHTSA case number), even when it names several vehicles.
3 complaints report injuries (6 injured).
Federal crash records (FARS 2020–2023): 2001 Mitsubishi Diamante vehicles were involved in 2 fatal crashes with 1 occupant death. Involvement counts are not adjusted for how many are on the road and do not imply fault or a vehicle defect.
Most reported problems
| Component | Complaints | Share |
|---|---|---|
| Visibility → | 56 | 72% |
| Engine and Engine Cooling → | 14 | 18% |
| Power Train | 4 | 5% |
| Service Brakes, Hydraulic | 4 | 5% |
| Suspension | 3 | 4% |
| Tires | 3 | 4% |
| Equipment | 1 | 1% |
| Seat Belts | 1 | 1% |
| Structure | 1 | 1% |
| Traction Control System | 1 | 1% |
Component groups as classified by NHTSA. A complaint can name more than one component, so shares may sum to more than 100%.
All 12 reported components →Common symptoms owners describe
Keyword analysis of complaint narratives; one complaint can describe several symptoms.
Mileage when problems occurred
Among the 57 complaints that included a usable odometer reading, the median reported incident mileage was 59,750 miles (middle 50% between 45,000 and 75,000 miles).
Complaints by incident year
What owners report
“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…”
Traction Control System · filed Jan 21, 2011
“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”
Visibility · filed Apr 9, 2009
“Mitsubishi diamante infamous heater core problem antifreeze leaks into interior of car. Horrible sickening anti freeze smell, happens on an abundance of mitsubishi cars. *tr”
Visibility · filed Aug 13, 2008
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Technical service bulletins
66 manufacturer communications (TSBs, service campaigns, warranty extensions) are on file with NHTSA for the 2001 Mitsubishi Diamante. The 10 most recent:
This is a Dealer Letter sent to dealers informing that Mitsubishi Technical Training has launched the 3rd quarterly technician quiz for 2023.
DEALER LETTER · Service Bulletin/Repair Instructions · issued Jul 21, 2023
This Technical Service Bulletin provides instructions and material safety data sheets for removal of rap-film adhesive residue.
TSB-23-00-004 · Service Bulletin/Repair Instructions · issued Apr 24, 2023
This Technical Service Bulletin reviews the regulations that require a label showing the reduction in load carrying capacity be affixed to vehicles when the total net weight of accessories is more than 1.5 percent of…
TSB-23-00-001 · Service Bulletin/Repair Instructions · issued Apr 24, 2023
This is a Dealer Letter sent to dealers informing that Mitsubishi Technical Training has launched the 2nd quarterly technician quiz for 2023.
DEALER LETTER · Service Bulletin/Repair Instructions · issued Apr 21, 2023
This Technical Service Bulletin was sent to dealers to explain the difference between normal dew condensation, which is a natural phenomenon, and water penetration caused by improper sealing or a defective/broken part.
TSB-22-54-003 · Service Bulletin/Repair Instructions · issued Apr 7, 2022
This is a service newsletter (Tech Talk) that was sent out to dealers.
TT253 · Service Bulletin/Repair Instructions · issued Nov 26, 2019
This is a Technical Service Bulletin sent to dealers. This bulletin supersedes TSB-18-00-003, issued April, 2018, to add updated information for Carrying Capacity Reduced Label.
TSB-19-00-008 · Service Bulletin/Repair Instructions · issued Jul 30, 2019
This is a message sent to dealers, to inform them that an update for MEDIC will be available.
MEDICUpdate517 · Service Bulletin/Repair Instructions · issued Feb 27, 2018
This is a service newsletter (Tech Talk) that was sent out to dealers.
TT237 · Service Bulletin/Repair Instructions · issued Feb 26, 2018
This is a service newsletter (Tech Talk) that was sent out to dealers.
TT218 · Service Bulletin/Repair Instructions · issued Aug 28, 2015
TSBs are repair guidance manufacturers send to dealers — they are not recalls and repairs are not automatically free. Full documents are available on NHTSA’s site.
Safety recalls
The 2001 Mitsubishi Diamante has 2 NHTSA recall campaigns — recall repairs are free at franchised dealers regardless of the vehicle’s age.
Check whether your specific vehicle is affected
Recall campaigns often cover only certain VIN ranges. Enter your VIN on the official NHTSA site to confirm whether your vehicle is included and whether the repair is still open.
Check VIN on NHTSA →Buying a used 2001 Mitsubishi Diamante?
- · Decode the seller’s VIN with our free VIN decoder to confirm the exact year, engine and trim.
- · Check for unrepaired recalls by VIN on NHTSA’s official lookup — recall repairs are free.
- · Among complaints with usable mileage, the median reported incident mileage was 59,750 miles. This does not predict when a particular vehicle will develop a problem.