2015 Dodge Dart Check Engine Light: Troubleshooting Guide
The 2015 Dodge Dart relies on the PCM to monitor emissions, ignition, and fuel systems. When the check engine light pops on, use this structured workflow to interpret the warning, catch up on maintenance, and fix the root cause before it escalates.
- Powertrains: 2.4L Tigershark I4 (automatic/manual) and 2.0L base engines.
- Initial actions: Record all codes, capture freeze-frame data (load, trims, temp), and inspect vacuum/PCV lines.
- Recommended tools: OBD-II scanner with live data, fuel pressure gauge, smoke machine, throttle body cleaner, spark tester.
Common 2015 Dart Codes
| Code | Symptoms | Likely Cause | First Diagnostic Steps |
|---|---|---|---|
| P0300/P030x | Misfire, flashing MIL | Ignition coil failure, fouled plug, intake leak | Swap coils, inspect plugs, smoke-test intake and PCV system. |
| P2096/P2098 | Post-catalyst fuel trim lean | O2 sensor drift, exhaust leak, misfire | Check for exhaust leaks, verify O2 switching, address misfires first. |
| P0440/P0456 | Fuel odor, MIL after refueling | Loose cap, EVAP purge/vent valve leak | Install new cap, smoke-test EVAP, inspect ESIM module. |
| P0128 | Coolant temp low, slow warm-up | Thermostat stuck open, low coolant | Check coolant level, replace thermostat, bleed air. |
| P1524 | Oil pressure/MDS performance fault | Low oil level, sensor malfunction | Verify oil level, test oil pressure sensor, inspect wiring. |
Diagnostic Flow
- Gather data: Read engine/transmission codes, note fuel trims, Mode $06$ counters, and coolant temp.
- Visual inspection: Check ignition components, vacuum hoses, PCV elbows, and for oil/coolant contamination.
- Ignition/fuel check: Swap coils/plugs, verify fuel pressure (58 psi nominal), inspect injectors.
- Emissions: Smoke-test EVAP lines, inspect catalytic converter and O2 sensors for wiring damage.
- Throttle/airflow: Clean throttle body, check MAP sensor, and ensure adaptives reset after cleaning.
- Road test: Clear codes, perform a mixed drive cycle, confirm trims stay within +/-10%, and monitors settle to “complete.”
When to See a Mechanic
- Flashing MIL paired with power loss, raw fuel smell, or low oil pressure warnings.
- P0299 or P2096/P2098 returning immediately after ignition and boost repairs.
- Persistent misfires or MultiAir faults after coil, plug, and oil-service interventions.
Resetting the Light
- Scan tool reset: Restore Mode $04$ after repairs; monitor readiness states.
- Battery disconnect: Avoid unless necessary-resets adaptives and radio presets.
- Flashing MIL: Stop driving; active misfire can damage the catalytic converter.
Preventive Maintenance Tips
- Replace spark plugs every 30,000 miles; inspect coils for cracking or tracking.
- Follow the oil and filter schedule; MultiAir valve actuators are highly sensitive to oil quality.
- Keep the throttle body plus MAP/IAT sensors clean to prevent airflow and correlation faults.
- Inspect EVAP hoses, the ESIM module, and the fuel cap annually for cracks or seal damage.
Frequently Asked Questions
Why does P2096/P2098 return after sensor replacement?
These codes usually point to exhaust leaks or a misfire. Repair leaks and resolve misfires before replacing any O2 sensor.
How do I reset the MIL after repairs?
Clear the MIL with an OBD-II scanner, then drive 30-50 miles so readiness monitors flip back to complete.
Can a dirty throttle body trigger limp mode?
Yes. Carbon buildup causes throttle correlation errors; clean the throttle body and run the ETC relearn.