Dodge Avenger Check Engine Light Resets Itself: What to Do Next
If your Dodge Avenger’s MIL clears on its own and then comes back a few days later, the PCM is detecting an intermittent fault. Follow this diagnostic plan to capture the code while it’s present, fix the underlying issue, and keep the light off for good.
- Applies to: 2008–2014 Dodge Avenger with 2.4L or 3.6L engines.
- Tools: OBD-II scanner with live data, smoke tester, multimeter, fuel pressure gauge.
- Tip: Check the scanner’s “pending” and “permanent” code lists—intermittent faults often hide there.
Likely Intermittent Faults
| Code | Symptom | Root Cause | Verification |
|---|---|---|---|
| P0456/P0457 | MIL after refueling, occasional fuel odor | Loose gas cap, ESIM (evap leak module) sticking | Replace cap, smoke-test EVAP lines, inspect ESIM. |
| P2096/P2098 | Post-cat lean codes, poor fuel economy | Exhaust leak, O2 sensor drift | Check manifolds/flex connections, monitor O2 waveforms. |
| P0300/P030x | Intermittent misfire, flashing MIL under load | Coil, spark plug, injector or wiring fault | Swap coils/plugs, inspect injector pulse, run compression test. |
| P0128 | Coolant temp low on cold mornings | Thermostat stuck open | Monitor ECT warm-up profile, replace thermostat if needed. |
Diagnostic Steps
- Scan immediately: As soon as the MIL returns, pull codes and freeze-frame data; note RPM, load, trims, temperature.
- Inspect high-failure items: EVAP hoses and gas cap, ignition coils, spark plugs, throttle body cleanliness.
- Run targeted tests: Smoke-test EVAP for P0456, swap coils for misfire, verify fuel pressure for lean codes.
- Repair and retest: After each fix, clear codes, drive 30–50 miles, and monitor Mode $06$/pending codes.
- Permanent codes: Some emissions codes require drive cycles to clear—ensure monitors return to “complete.”
Need More Support?
Read the 2013 Avenger check engine guide and transmission troubleshooting article for deeper insight.