2012 Dodge Journey Check Engine Light Reset Guide
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Resetting the MIL on a 2012 Journey without fixing the underlying fault only hides the problem temporarily and resets emissions monitors. Use this guide to diagnose the cause, complete repairs, and perform a proper reset that keeps the light off.
- Applies to: 2012 Journey AVP, SE, SXT, Crew, R/T (2.4L and 3.6L models).
- Tools: OBD-II scan tool with enhanced data, smoke machine, fuel pressure gauge, DVOM.
- Warning: A flashing MIL indicates severe misfire. Reduce throttle immediately and diagnose before further driving.
Common 2012 Journey Codes
| Code | Subsystem | Likely Cause | First Checks |
|---|---|---|---|
| P0300/P030x | Ignition/Fuel | Coils, plugs, injector imbalance, compression issues | Inspect plugs, swap coils, perform injector balance test, verify compression. |
| P0128 | Cooling | Thermostat stuck open, low coolant temperature | Check coolant level, monitor ECT warm-up, inspect thermostat operation. |
| P0420/P0430 | Catalyst | Efficiency drop from misfire, exhaust leak, or rich mixture | Check for misfires, inspect exhaust, compare O2 sensor readings. |
| P0456 | EVAP | Loose gas cap, cracked vapor line, purge valve leak | Inspect fuel cap, smoke-test EVAP system, command purge closed. |
| P06DD | Oil Pump Control | Dual-stage oil pump stuck, incorrect filter | Verify oil level and filter, measure mechanical oil pressure, inspect wiring. |
Reset Workflow After Repairs
- Scan and document: Save stored/pending/permanent codes, freeze-frame data, long/short fuel trims, and Mode $06$ results.
- Repair root causes: Resolve misfires, cooling issues, EVAP leaks, or oil pressure faults before clearing codes.
- Use the scan tool reset: After repairs, clear codes via Mode $04$. Avoid disconnecting the battery to preserve adaptives.
- Drive-cycle verification: Follow Chrysler’s drive cycle: idle two minutes, accelerate gently to 45 mph, cruise, decelerate without braking, then complete highway cruise.
- Rescan: Confirm the MIL remains off, readiness monitors show COMPLETE, and no pending/permanent DTCs remain.
Driving Guidance While Diagnosing
- Avoid heavy loads or towing while misfire or catalyst codes are active.
- Short trips with EVAP-only codes are acceptable, but plan repairs before inspection deadlines.
- Monitor coolant temperature and oil pressure; abnormal readings demand immediate attention.
Preventive Maintenance Checklist
- Change oil with MS-6395 5W-20 and Mopar filter every 6,000 miles to support the dual-stage pump.
- Inspect spark plugs every 30,000 miles; replace at 60,000 miles (2.4L) or 100,000 miles (3.6L).
- Check intake manifold gaskets, PCV valve, and purge lines each service interval.
- Keep the throttle body clean and perform idle relearn after battery disconnects.
- Update PCM/TCM software; later calibrations improve misfire detection and EVAP diagnostics.
Frequently Asked Questions
Can I reset the light by pulling the fuse?
Pulling the PCM fuse only clears the light temporarily. The MIL returns once the PCM reruns diagnostics if the fault remains.
Do I need a dealer tool to reset monitors?
No. Any capable scan tool can clear codes. Complete the drive cycle afterward so readiness monitors turn to COMPLETE.
How long should I wait before emissions testing?
After repairs, drive 40–60 miles with mixed conditions. Verify all monitors are COMPLETE before scheduling inspection.
Related Journey Resources
- General Journey MIL workflow.
- 62TE transmission troubleshooting.
- Ignition diagnostics when misfires persist.