2004 Mitsubishi Diamante problems, complaints & recalls
Most-reported problem areas: Power Train (2) · Power Train:automatic Transmission (1)
🧭 Reliability snapshot
Compared against other Mitsubishi Diamante model years — complaint volume vs the model's median year, recalls and severity. How we score →
Safety recalls (0)
No recalls on record for this model year (campaigns announced since 2010).
Service bulletins (29)
Technical service bulletins are repair instructions manufacturers send dealers for known issues. Unlike recalls, the fix is not automatically free — but naming the bulletin at the service desk can save diagnosis time and support goodwill repairs.
Equipment:other:owners/Service/Other Manual 2023-07-21 · DEALER LETTER · Service Bulletin/Repair Instructions
this is a dealer letter sent to dealers informing that mitsubishi technical training has launched the 3rd quarterly technician quiz for 2023.
Structure 2023-04-24 · TSB-23-00-004 · Service Bulletin/Repair Instructions
this technical service bulletin provides instructions and material safety data sheets for removal of rap-film adhesive residue.
Equipment:other:owners/Service/Other Manual 2023-04-24 · TSB-23-00-001 · Service Bulletin/Repair Instructions
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 the vehicle's gross vehicle weight rating (gvwr) or 100 lbs.
Equipment:other:owners/Service/Other Manual 2023-04-21 · DEALER LETTER · Service Bulletin/Repair Instructions
this is a dealer letter sent to dealers informing that mitsubishi technical training has launched the 2nd quarterly technician quiz for 2023.
Unknown Or Other 2022-04-07 · TSB-22-54-003 · Service Bulletin/Repair Instructions
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.
Equipment 2019-11-26 · TT253 · Service Bulletin/Repair Instructions
this is a service newsletter (tech talk) that was sent out to dealers.
Showing the 6 most recent of 29 bulletins. Search all of them free at nhtsa.gov.
What owners report
2019-11-08 · Power Train · 3 mi“the diamante has an odd issue where the vehicle will not shift gears correctly which an extremely dangerous issue for drivers. the information board shows the transaction rapidly switching from neutral to drive excessively. i have had multiple mechanic shops look into this issue from transmission specialists, to electrical specialist and have …”
2012-06-13 · Power Train:automatic Transmission“cpsc#i11b0131a. 2004 mitsubishi diamante. f4a51 automatic transmission failure. *ln the consumer stated she has concerns with the safety and reliability of mitsubishi and dodge vehicles and their owners that have the mitsubishi f4a51 automatic transmission in certain make/models. the main issues seemed to be a manufacturing defect in the wave/cu…”
2011-11-15 · Power Train · 50,000 mi“the main issue seems to be a manufacturing defect in the wave/cushion spring located in the transmission. mitsubishi has designed the wave spring as a fragile two coil piece which has been known to repeatedly break causing catastrophic failure in the transmission. this in turn poses a threat on the driver and passengers. when this wave spring…”
Excerpts of consumer complaints filed with NHTSA, lightly truncated. They are owner statements, not verified findings.