Why the Check Engine Light Turns On in a Dodge Durango
Across model years, the Durango’s check engine light indicates the PCM found a fault in ignition, fuel, EVAP or transmission systems. Here are the most common reasons and how to respond safely.
- Steady light: Non-urgent but requires diagnostics soon—scan for DTCs.
- Flashing light: Severe misfire or fuel control fault; reduce throttle immediately to protect the catalyst.
- Basic tools: OBD-II scanner, spark tester, smoke tester, fuel pressure gauge, multimeter.
Typical Durango Codes
| Code | Subsystem | Likely Cause | First Checks |
|---|---|---|---|
| P0300/P030x | Ignition | Coil or spark plug failure, valve/lifter wear | Swap coils/plugs, run compression test, inspect lifters. |
| P0456 | EVAP | Loose gas cap, purge hose leak | Install OEM cap, smoke-test EVAP lines. |
| P2096/P2098 | Fuel trim | Exhaust leak, O2 sensor drift | Inspect exhaust joints, monitor O2 sensors. |
| P0740/P0741 | Transmission | Torque converter clutch issue, solenoid fault | Read TCM codes, check ATF level/condition. |
After repairs, clear the codes with a scan tool and complete a mixed drive cycle to ensure readiness monitors reset.
For a full Durango diagnostic workflow, see the Durango check engine guide.