One problem related to ignition has been reported for the 2003 Mitsubishi Diamante. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Mitsubishi Diamante based on all problems reported for the 2003 Diamante.
Various intermittent failures to include, car locking on its own, headlights not going out when car is turned off, car not dinging when keys left in ignition, and window fuse being blown when windows are not being raised or lowered. Have taken car to dealer and an electrical specialist. Both have said they can't fix it since the problem is intermittent.
| Ignition problems | |
| Anti-theft Controller problems |