Why the Dodge Dart Check Engine Light Comes On
The Dodge Dart’s check engine light illuminates when the powertrain control module detects a problem affecting emissions or drivability. This guide outlines the common causes, diagnostic steps, and preventive maintenance to keep the light off.
- Applies to: 2013-2016 Dodge Dart models.
- Tools: OBD-II scanner with live data, EVAP smoke tester, fuel pressure gauge, multimeter.
- Immediate action: A flashing MIL indicates an active misfire. Reduce throttle immediately to protect the catalytic converter.
Common Dodge Dart DTCs
| Code | Subsystem | Likely Cause | First Checks |
|---|---|---|---|
| P0300/P030x | Misfire | Coil failure, fouled plugs, intake valve carbon | Monitor misfire counters, inspect plugs/coils, consider intake cleaning. |
| P0420/P0430 | Catalyst | Misfire history, rich mixture | Compare upstream/downstream O2 sensor signals, inspect exhaust leaks. |
| P0441/P0456 | EVAP | Loose gas cap, purge solenoid, cracked hoses | Smoke-test EVAP system, inspect cap seal, command purge. |
| P2017/P2015 | Intake runner control | Runner actuator failure, wiring issues | Inspect actuator, check wiring harness, perform actuator tests. |
| P0201-P0204 | Injector circuits | Injector wiring fault, injector failure | Check injector resistance, inspect harness, perform injector balance test. |
Diagnostic Workflow
- Scan and document: Record stored/pending codes, freeze-frame data, and Mode 06 results.
- Inspect basics: Check fluids, battery voltage, intake hoses, vacuum lines, and PCV system.
- Prioritize misfire and fuel control codes: Fix these first to avoid catalyst damage and false sensor codes.
- Subsystem tests: Smoke-test EVAP, measure fuel pressure, scope sensors, and test intake runner actuators.
- Verify repair: After repairs, clear codes with Mode $04$, complete a drive cycle, and confirm readiness monitors report COMPLETE.
Preventive Maintenance Tips
- Replace spark plugs on schedule; apply dielectric grease to coil boots.
- Use top-tier fuel and periodic intake valve cleaning to prevent carbon buildup.
- Inspect EVAP hoses and gas cap seals during oil changes.
- Keep PCM software updated; some Darts require flashes for runner control and EVAP logic.
- Maintain battery/charging voltage to prevent false sensor codes.
Frequently Asked Questions
Can I drive with a steady MIL?
Short trips are usually safe if performance is normal, but schedule diagnostics soon to avoid catalyst or injector damage.
Why does the light come back after clearing?
The underlying issue persists. Use freeze-frame data to reproduce conditions and finish diagnostics before clearing again.
How do I prepare for emissions testing?
After repairs, drive 30-50 miles with mixed conditions and verify all readiness monitors show COMPLETE.
Compare to the model-specific Dart diagnostic guide for additional code tables and maintenance advice.
When to Seek Professional Help
Consult a professional if PCM updates are required, if wiring corrosion is present, or if misfires persist after maintenance. Advanced diagnostics protect the engine and emissions system from further damage.