How to Reset the Check Engine Light on a Dodge Charger (2023 Update)
Clearing the check engine light on a Dodge Charger is more than pushing a button. The PCM stores fault data, readiness monitors, and diagnostic codes that point to the underlying problem. Follow the steps below to diagnose the issue, fix it correctly, and reset the light without masking the fault.
- Applicable models: 2006-2023 Charger trims (SXT, R/T, Scat Pack, Hellcat).
- Tools required: OBD-II scanner with data logging, multimeter, basic hand tools, smoke tester (EVAP leaks).
- Before clearing: Record all DTCs, note freeze-frame data, and check battery voltage (weak batteries cause false codes).
Common Charger Codes and Fixes
| Code | Area | Likely Cause | Quick Fix |
|---|---|---|---|
| P0300/P030x | Ignition/Misfire | Coil, spark plug, HEMI lifter wear | Swap coils, inspect plugs, check compression and lifter noise. |
| P0456 | EVAP | Loose fuel cap, cracked purge hose | Replace gas cap with OEM, smoke-test EVAP lines. |
| P0420/P0430 | Catalyst | Catalyst efficiency low, misfire damage | Repair misfire first, check exhaust leaks, monitor O2 sensors. |
| P2110/P0123 | Throttle | Dirty throttle body, TPS range fault | Clean throttle bore, verify TPS voltage sweep, perform relearn. |
| P1524 | MDS/Oil pressure | MDS solenoid, low oil pressure | Check oil level/quality, test solenoid operation, inspect wiring. |
Reset Workflow (Do It Right)
- Scan and document: Capture all powertrain codes, freeze-frame snapshots, fuel trims, and Mode $06$ misfire counters.
- Inspect basics: Check coil connectors, vacuum lines, intake tubing, and battery/ground integrity.
- Repair root cause: Swap coils/plugs, clean throttle body, fix EVAP leaks, or replace faulty sensors.
- Verify fix: Clear pending codes, run live data, and confirm trims return to normal ranges.
- Reset the MIL: Use the scan tool’s Mode $04$ (Clear/Reset) function. Avoid battery disconnects-these erase adaptive values and may hide the fault temporarily.
- Drive cycle: Perform a mixed city/highway drive (50-80 km) so readiness monitors reset to “complete.” Re-scan to ensure no new codes appear.
When to See a Mechanic
- Flashing MIL with rough running, raw fuel smell, or obvious power loss.
- P030x, P0456, or P2110 codes returning immediately after repairs.
- Low oil pressure warnings or lifter noise on HEMI engines after maintenance.
FAQs
Can I just disconnect the battery to clear the light?
Disconnecting the battery is a last resort. It erases adaptive fuel trims and radio presets without fixing the underlying problem. Always diagnose and repair the fault first, then clear with a scan tool.
Why does the light keep coming back after I clear it?
The MIL will return if the fault persists. Re-scan the Charger, review freeze-frame data, and address the root cause-common culprits are misfires, EVAP leaks, or throttle correlation errors.
Is it safe to drive with a flashing check engine light?
No. A flashing MIL means the engine is misfiring and will damage the catalytic converters-back off the throttle and fix the fault before you drive again.
Preventive Maintenance Tips
- Replace spark plugs and coil boots on schedule (5.7L every 30k miles, 6.4L/Hellcat every 60k miles).
- Clean the throttle body and MAP sensors at each oil change.
- Inspect the OEM fuel cap and EVAP hoses yearly; cracks or loose seals will retrigger the MIL.
- Stay current on PCM software updates-TSBs often include misfire and throttle/EVAP calibration improvements.