[Mike Daily]

The drivers side interior light stays on while I am driving. All other go off when engine starts.
Has anybody had this problem?

 

[Rick 45-70]

Might be a bad catalytic converter........or defective DEF injector......or bad DEF................................

 

[t1n0m3n]

The drivers side interior light stays on while I am driving. All other go off when engine starts.
Has anybody had this problem?

Press the drivers side map light button?

 

[t1n0m3n]

Might be a bad catalytic converter........or defective DEF injector......or bad DEF................................

Try changing the interior light's DEF fluid. It might have gone bad.