2010 Dodge Charger Check Engine Light: Priority Diagnostics
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The 2010 Charger combines legacy LX electronics with aging ignition components, so a lit MIL can trace back to simple maintenance issues or critical engine and transmission faults. Use this structured guide to triage codes, prevent catalytic damage, and document a repair that keeps the light off.
- Applies to: 2010 Charger SE, SXT, R/T, Police Pursuit (3.5L V6 and 5.7L HEMI).
- Tools: Bidirectional scan tool, misfire counters (Mode $06$), fuel pressure gauge, EVAP smoke machine, digital multimeter.
- Critical warning: A flashing MIL paired with rough running indicates a severe misfire. Reduce load immediately to protect the catalysts.
Common 2010 Charger Trouble Codes
| Code | Subsystem | Typical Cause | First Checks |
|---|---|---|---|
| P0300/P030x | Ignition/Fuel | Coil-on-plug failure, fouled plugs, injector imbalance | Swap coils, inspect plugs, review misfire counters, perform compression test. |
| P0171/P0174 | Fuel Trim | Intake leaks, PCV faults, weak fuel pump | Smoke-test the intake, inspect PCV hoses, verify fuel pressure at load. |
| P0420/P0430 | Catalyst Efficiency | Unresolved misfires, rich mixture, exhaust leaks | Check misfire history, compare upstream/downstream O2 signals, inspect manifold gaskets. |
| P0456/P0457 | EVAP | Loose or damaged gas cap, cracked EVAP hose, purge valve leak | Inspect cap seal, smoke-test EVAP system, command purge solenoid closed. |
| P0700 + P0750/P0755 | Transmission | LR solenoid circuit, valve body faults, wiring corrosion | Read TCM subcodes, inspect harness at 42RLE connector, verify ATF+4 level and condition. |
Workflow to Find the Root Cause
- Capture baselines: Pull stored/pending/permanent DTCs, save freeze-frame data, long-term fuel trims, and Mode $06$ misfire counts before clearing anything.
- Fix misfires first: Replace overdue spark plugs, swap coils between cylinders, perform injector balance or power balance tests, and verify compression.
- Solve fuel trim issues: Smoke-test the intake, inspect exhaust manifolds for leaks, and confirm fuel pressure stays within 55–61 psi.
- Re-evaluate catalyst codes: After misfires are resolved, clear codes, perform a highway drive, and ensure P0420/P0430 do not return.
- Diagnose EVAP leaks: Seal the system with the scan tool, apply smoke, and check the ESIM switch and filler neck for leaks.
- Address transmission codes: Retrieve TCM data, inspect the range sensor and solenoid wiring, verify grounds, and service ATF+4 if contaminated.
- Complete a drive cycle: Run mixed city/highway driving so readiness monitors return to COMPLETE and confirm no pending codes remain.
Driving Guidance
- With a flashing MIL or limp mode, avoid highway speeds and heavy loads; tow if necessary.
- Steady EVAP or minor catalyst codes allow limited driving, but schedule repairs before emissions testing.
- Monitor oil pressure, coolant temperature, and transmission temperature to prevent secondary damage.
Preventive Maintenance Checklist
- Replace copper spark plugs every 30,000 miles on the 5.7L and inspect plug wires for heat damage.
- Clean the throttle body and MAP sensor yearly to stabilize idle airflow.
- Install a new fuel cap if EVAP codes repeat; seals commonly crack on older LX models.
- Flush ATF+4 and replace the filter every 60,000 miles to reduce solenoid and range sensor faults.
- Update PCM and TCM software (TSB 18-032-10 and later) to refine misfire detection and shift logic.
Frequently Asked Questions
No. Misfire codes reflect ignition, fuel delivery, or mechanical problems. Premium fuel may reduce knock but does not repair the root cause.
How long can I drive with an EVAP leak?
Short trips are acceptable, but an illuminated MIL prevents emissions readiness. Repair the leak within a week to avoid inspection failures.
Do I need dealer software to reset monitors?
No. Any capable scan tool can clear codes. After repairs, follow Chrysler’s drive cycle (idle, steady 45 mph, decel, highway cruise) so monitors complete.
Related Charger Guides
- General Charger check engine workflow.
- 2015 Charger code matrix for newer calibration reference.
- Transmission troubleshooting guide when P0700 and solenoid codes appear.