maintenance light on

I have a 91 Dakota with 5.2 automatic with overdrive. The required maintenance light on the dash is on. There are no codes that have popped up. The PCM was replaced 2 years ago. Any ideas where I should start looking? Thanks

This could be just a maintenance reminder. The engine controller records vehicle mileage and turns on the light at 60k, 82.5k and 120k. If this is the case, take it somewhere that has a diagnostic scan tool and have it re-set. You might check with your local parts store, they may have the tool to re-set it.