Most Common Reason for a 2017 Dodge Durango Check Engine Light
On 2017 Durangos, the MIL most frequently appears because of EVAP leaks (P0456) or ignition misfires (P030x). Other recurring causes include thermostat faults (P0128), O2 sensor efficiency codes (P0420/P0430) and 8HP transmission adaptives (P1DF3). Diagnose the specific code with a scan tool, repair the fault, and clear the MIL after verification.
If the light flashes, treat it as an emergency—reduce throttle immediately and fix the misfire to prevent catalyst damage.