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really awful
Crashes / Fires:
1 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
40,048 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 electrical problems

electrical problem

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2002 Mitsubishi Diamante Owner Comments

problem #8

Feb 012015


  • 65,289 miles


The contact owns a 2002 Mitsubishi Diamante. While driving at 45 mph, the vehicle stalled without warning. The vehicle was taken to the dealer for diagnostic testing. The dealer was unable to diagnose the cause of the failure and stated that the VIN was not included in NHTSA campaign number: 02V100001 (electrical system.) the manufacturer was made aware of the failure. The failure mileage was 65,289.

- Perth Amboy , NJ, USA

problem #7

Jul 262012

Diamante 6-cyl

  • Automatic transmission
  • 140,000 miles
The contact owns a 2002 Mitsubishi Diamante. The contact stated that while driving at 75 mph, the contact attempted to brake but the brakes failed to respond without any warnings. The vehicle crashed into a passenger van. The vehicle was destroyed. The contact mentioned that two months prior to the failure the check engine light had illuminated. The vehicle was taken to an independent mechanic for diagnosis and was informed that the vehicle misfires, needed spark plugs, a fuel pump, a fuel injector, an egr valve, and the engine surged erratically. The failure and current mileage was 140,000. Updated 12/06/12 updated 12/6/2012

- Orangeburg, SC, USA

problem #6

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 #5

Oct 012008


  • miles


There should be a recall, own a 2002 Mitsubishi Diamante. I just found out that the anti-freeze smell and the smoke coming through the vents is because the heater core has gone bad. The quote I received was for $1100. My antenna just stopped working on me also. It doesn't go down anymore, but the motor still sounds like its working. We are all having too many of the same problems. The company should be liable.

- Jacksonville, FL, USA

problem #4

Jul 312008


  • 20 miles
I own a 2002 Mitsubishi Diamante car, I bought this car in 02 since the 1st day I bought the car there was problems. The computer in the car went crazy my check engine light, ,cruise control, anti lock brake, tcl light all started flashing. I took the car back to the dealer & they replaced the computer but it didn't work they put 3 computers in since then, these lights are still on till this day. In 06 my trans blew I took the car back to the dealer they replaced my trans the car still doesn't ride right. My A/C turns on but nothing comes out sometimes. In the winter the inside of my car becomes a fog all over my windows and it wont stop fogging up. A smell is coming out of my vents like a coffee smell & im inhaling this smell whenever im in the car I have to go to a doctor to get checked out to see if I have health sun roof leaks when it rains, I took my car back to the dealer to have all these issues fixed but they never did I purchased the car in 02 the warranty lasted 02-05 B/C that is when my warranty expired. When I call they tell me I have to pay out of pocket B/C the warranty expired. This isn't fair to any Mitsubishi owner I shouldn't have to pay to have my car fixed now after the warranty when all the same problems have been recurring since I purchased the car and they never fixed it to begin with. I can understand if I was the only person with these problems I decided to search the internet to see if anyone else owned my make and model of my car to see if they had similar problems sure enough I came across a website called there's over 50 people with the same problems I have with my car.Mitsubishi should fix these problems and stand by there cars. I called corporate headquarters today & was told there's nothing they can do B/C its out of warranty.

- Wanaque, NJ, USA

problem #3

Nov 242007


  • miles
I have a 2002 Mitsubishi Diamante. I have kept regular maintenance. I am submitting this form because of a heater core issue I am having. However I have had the following problems with this car. All these problems seem to be recurring problems that happen to many people with this model. At least that is what I find when I search the issues on the internet 1- vibration in steering wheel --this happened multiple times after taking car back to dealer-it appears there is a known issue with the rotors in this car. After having the rotors cut twice by the dealer with no long lasting success. I had to have the brakes and rotors replaced by a mechanic ( car had less the 10,000 miles when issue started happening) 2- rusted muffler--not sure if this issue happens often but after 23,000 miles I had to have my muffler replaced because there was a hole rusted through the top of it-I was told this could happen for not using the car very much in the winter time( road salt can cause the rust) 3- heater core- I know have a heater core problem in this car. I have antifreeze leaking in passenger compartment. I have an antifreeze smell in the cabin of the car. My windows fog and the defroster will not clear the windshield ( makes it worse). I am low in antifreeze because of this. My service engine light has now come on and I am told this can be caused by leaking antifreeze onto the computer which is positioned under the heater core. This issue is widely reported on the internet in many forums and seems everybody with a Diamante will eventually have this problem. I am being told this repair can cost over 1,000 dollars 4-I have had to replace 3 sensors in the engine 2 egr and 1 idle sender (cost around 1,500 dollars). This may or may not be because of the heater core issues causing the cars computer to fail.

- Brooklyn, NY, USA

problem #2

Dec 172003

Diamante 6-cyl

  • Automatic transmission
  • 21,076 miles
While driving at any speed electrical system failed. As a result, the vehicle stalled in oncoming traffic. It was later determined by the dealer's technician that the etacs systems failed.

- Charlotte, NC, USA

problem #1

Feb 132003

Diamante 6-cyl

  • Automatic transmission
  • 1 miles
Headlights turn off for a split second while driving down the highway. It does this when the ac system kicks in. Lights on the inside of the vehicle dim as well. This happens at both idle and high RPM. A volt meter shows a large voltage spike for a short period of time. The voltage regulator is not responding fast enough to pick up the voltage. Have worked for over a year with Mitsubishi to attempt to get this resolved. Their mechanics at 2 dealerships say that the problem isn't normal until they don't figure out the problem. Then they come back and say it's normal. I have yet to see a car do this - especially with the lights turning off while driving down the highway. If the problem was "normal" they wouldn't have taken my car into the shop to investigate the problem in the first place -- why spend hours trying to find a bad wire if the problem is "normal". I feel this is a possible safety issue, and the Mitsubishi district manager refuses to authorize the service dept to replace my alt. Or battery to see if it will resolve the problem. This has happened since the first month I had my car, and continues to happen now that there is 20000 miles on the vehicle. Number of failures is hard to estimate since it is a constant issue every time the ac kicks in at night. Will put 180 assuming 15 times driving at night per month.

- Irving, TX, USA

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