Huge win for car owners! All TSBs to be made public. The Center for Auto Safety just made the NHTSA (US Government) make public the full text of all TSBs from now on. They are the same organization that has petitioned the NHTSA & filed lawsuits to protect car owners over exploding gas tanks & other major safety issues. Whenever you drive in your car, you are safer thanks in part to a lot of work over the years by this small but very effective consumer advocacy group.

Please take a moment & say thank you by donating $5 or whatever you can to the Center for Auto Safety.


really awful
Crashes / Fires:
0 / 0
Injuries / Deaths:
1 / 0
Average Mileage:
62,846 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2002 Mitsubishi Diamante transmission problems

transmission problem

Find something helpful? Spread the word.
Get notified about new defects, investigations, recalls & lawsuits for the 2002 Mitsubishi Diamante:

Unsubscribe any time. We don't sell/share your email.

2002 Mitsubishi Diamante Owner Comments

problem #5

Oct 162009


  • 94,000 miles


I have a '02 Mitsubishi Diamante and I have had problems out of the heater core leaking and now its affected my ECU (computer) I call the dealership and they want outrageous prices to fix or even check my car.. I think that since its a problem from the dealer they should recall these cars.. I know I will never buy another Mitsubishi and I will never recommend them to a friend.. what can be done about this problem?

- Raccoon, KY, USA

problem #4

Jan 162009


  • 68,228 miles
I have had the transmission replaced including the torque converter $5000. I am going on my second power antenna $300. The most recent called for a heater core replacement $1050.

- North Richland Hills, TX, USA

problem #3

Feb 092008

Diamante 6-cyl

  • Automatic transmission
  • 72,000 miles
Transmission retaining rings brake and jam gears. Car stopped in intersection had to be pushed off road and towed to shop replaced transmission. Was told by repair person that this is something that Mitsubishi knew was happening for the last 2 years.

- Bakersfield, CA, USA

problem #2

Mar 282006

Diamante 6-cyl

  • Automatic transmission
  • miles
Heater core defective and leaked coolant underdash on to transmission ECM and neutral safety switch. Because of this very common manufacture defect I had to have my heater core, transmission ECM, neutral safety switch replace. And my transmission rebuild, none of which were warranted by the manufacture and were not cheap.

- Mineral Wells, TX, USA

problem #1

Jul 242007

Diamante 6-cyl

  • Automatic transmission
  • 80,000 miles
The contact owns a 2002 Mitsubishi Diamante. While driving 37 mph, the vehicle jerked and the service engine warning indicator light illuminated. The contact attempted to accelerate and pull off the road, but when the engine revved, the vehicle moved approximately three feet and stopped. The vehicle had experienced this failure on two occasions. The dealer replaced the transmission at 20,000 miles. The contact also stated that the windshield was severely fogged. The dealer replaced the heater core because it was leaking antifreeze into the cooling system. The driver was nauseated for two weeks. The VIN was unknown. The current and failure mileages were 80,000.

- Dover , DE, USA

Not what you are looking for?