Flashing Check Engine Light on a Dodge Charger: What It Really Means
A flashing MIL on any Dodge Charger—whether a V6 SXT or a supercharged Hellcat—is the PCM’s way of telling you an active misfire or fuel control fault is damaging the catalytic converters. Here is how to diagnose the issue quickly, stay safe on the road, and get back to full power.
- Applies to: 2006–2023 Charger models (LX/LD platform).
- Immediate action: Ease off the throttle, avoid towing/track driving, and scan for codes before further operation.
- Tools: OBD-II scanner with live data, spark tester, fuel pressure gauge, smoke tester.
Top Codes Behind a Flashing MIL
| Code | Likely Cause | Quick Checks |
|---|---|---|
| P0300/P030x | Misfire from ignition coil, spark plug, lifter/cam wear | Swap coils, inspect plugs, listen for lifter tick, run compression if misfire stays. |
| P020x | Injector circuit fault, TIPM wiring issue | Use a noid light for injector pulse, inspect TIPM connectors for corrosion. |
| P2110/P0123/P0222 | Throttle body contamination or TPS range fault | Clean throttle body, check 5 V reference, perform ETC relearn. |
| P0420/P0430 | Catalyst efficiency low after misfire | Compare pre/post O2 waveforms, inspect for exhaust leaks, confirm misfire is fixed. |
Step-by-Step Diagnostic Flow
- Capture data: Record codes, freeze-frame info (load, RPM, trims), and Mode $06$ misfire counters.
- Visual inspection: Check coil connectors, plug wires/boots, vacuum hoses, and battery voltage.
- Ignition verification: Swap coils/plugs to see if misfire moves; use spark tester to confirm coil output.
- Fuel delivery: Monitor fuel pressure and injector pulse width; check for clogged injectors or low pump output.
- Throttle/fuel trims: Clean throttle body, inspect MAP/MAP hoses, ensure trims return to normal after repairs.
- Road test: Clear codes, drive under light/moderate load, and confirm no new misfire counts appear.
Can I Keep Driving?
- Keep throttle input minimal; aggressive acceleration worsens misfires and damages the catalyst.
- If you smell sulfur or feel extreme heat near the converters, stop and arrange a tow.
- Aftermarket tunes can alter misfire detection; restore the stock calibration during troubleshooting.
Resetting the Light
- Scan tool: Clear the MIL after repairs and verify readiness monitors complete.
- Battery disconnect: Only for emergencies; resets adaptive trims and radio/seat memory.
- Persistent flash: Re-scan—if misfire returns, the underlying issue still exists.
Preventive Tips
- Replace spark plugs on schedule (30k miles for 5.7L, 60k for 6.4L/Hellcat) and torque correctly.
- Inspect coil boots and use dielectric grease sparingly to prevent carbon tracking.
- Keep PCM software current—factory flashes often refine misfire detection and throttle mapping.
- Track owners: monitor IAT2/intercooler temps and coolant levels to avoid detonation-related misfires.
Frequently Asked Questions
Why does the MIL keep flashing after coil replacement?
The shorted coil may have damaged the PCM driver, or the misfire is mechanical (lifter/cam wear). Check injector pulse, run compression, and inspect valvetrain noise.
Can an EVAP leak cause a flashing MIL?
Small EVAP leaks usually set a steady light, not flashing. If the MIL flashes, focus on misfire/fuel issues first.
Should I replace the catalytic converters after a flashing MIL?
Only if post-repair O2 readings show poor efficiency or P0420/P0430 returns. Fix the misfire first, then evaluate the catalyst.
More Charger Resources
See our Challenger check engine guide and transmission troubleshooting article for related diagnostics.