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2003 Mitsubishi Diamante LS Sedan

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2003 Mitsubishi Diamante LS - YouTube

The 2003 Mitsubishi Diamante is available as a 4-door, 5-seat sedan. Starting at $27,097, the 2003 Mitsubishi Diamante VR-X is powered by a 3.5L, 6-cylinder engine mated to an automatic transmission that returns an EPA estimated 17-mpg in the city and 25-mpg on the highway. The top of the line 2003 Mitsubishi Diamante LS, priced at $28,447, is powered by a 3.5L, 6-cylinder engine mated to an automatic transmission that returns an EPA estimated 17-mpg in the city and 25-mpg on the highway.

I bought a 2003 Mitsubishi Diamante LS. (Mitsubishi never again!!!) I repaired the "infamous" heater core leak myself at about 70K miles. Now, at 82K miles, the transmission is acting up. It very slowly engages into reverse and won't engage into drive unless you give it some gas. Took it to a transmission shop 7 weeks ago. Installed a used transmission and it didn't work. Rebuilt my original transmission and still does the same thing. I asked if it was the transmission control unit (TCU). The transmission tech says the 2003 year model did not have a TCU. He said it is all contained in the Powertrain Control Module (PCM). The PCM seems to be working fine. We can't figure out what's wrong, and my transmission tech and I are getting very frustrated. Any help would be appreciated.

2003 Mitsubishi Diamante LS FWD - Northwest Motorsport

2003 Mitsubishi Diamante LS 4dr Sedan Body Length 194.1 “
Body width 70.3 “
Body height 53.9 “
Gross weight 4,420 lbs
Curb 3,549 lbs
Wheelbase 107.1 “
Ground clearance 4.6 “

2003 Mitsubishi Diamante LS FWD Sedan with Sunroof