Table 1 shows two common power train related problems of the 2004 Mitsubishi Diamante.
| Problem Category | Number of Problems |
|---|---|
| Transmission Failure problems | |
| Transmission Not Go Into Gear problems |
Cpsc#i11b0131a. 2004 Mitsubishi Diamante. F4a51 automatic transmission failure. 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/cushion spring located in the transmission designed the wave spring as a fragile two coil piece which has been known to repeatedly break causing catastrophic failure in the transmission. When the wave breaks, actual pieces of the wave spring make it through Mitsubishi's also faulty transmission filter and lodge themselves in the pump gear,causing the hear to actually break. After the pump gear has been broken inside the transmission, all forward and reverse gears immediately stop functioning and in most instances the vehicle shuts off. The consumer stated she had the f4a51 automatic transmission in her vehicle, which had to be replaced.
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 had no positive results.