How to Deal with a 2023 Dodge Durango Check Engine Light
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The latest Durango calibrations use aggressive catalyst monitoring, dual-stage oil pumps, and stop/start logic. When the MIL turns on, the PCM logs data that pinpoints the fault. Use this guide to prioritize diagnostic trouble codes (DTCs), follow a structured workflow, and verify the repair so the light stays off.
- Applies to: 2023 Durango SXT, GT, R/T, Citadel, SRT 392, and SRT Hellcat.
- Tools: Enhanced OBD-II scanner with Mode $06$, smoke machine, fuel pressure transducer, oscilloscope for O2 analysis, mechanical oil-pressure gauge.
- Immediate warning: A flashing MIL indicates an active misfire. Reduce load immediately to protect catalysts and the torque converter.
High-Priority 2023 Durango Codes
| Code | Subsystem | Likely Cause | First Checks |
|---|---|---|---|
| P0300/P030x | Ignition/Fuel | Coils, spark plugs, injector imbalance, low compression | Review misfire counters, inspect plugs/coils, swap components, perform compression/leak-down testing. |
| P0430/P0420 | Catalyst | Efficiency loss after misfire, exhaust leak, or rich mixture | Check misfire history, inspect exhaust manifolds, compare upstream/downstream O2 waveforms. |
| P2096/P2098 | Fuel Trim | Post-catalyst lean condition | Smoke-test intake/exhaust, inspect PCV valve, monitor STFT/LTFT during steady cruise. |
| P06DD/P06DE | Oil Pump Control | Dual-stage pump stuck, incorrect filter, wiring fault | Confirm Mopar filter, measure mechanical oil pressure hot, inspect harness near oil cooler. |
| P1DF3/P1DC4 | Stop/Start | Auxiliary battery weakness, calibration mismatch | Load-test main and auxiliary batteries, inspect grounds, update PCM/TCM, perform stop/start relearn. |
Diagnostic Workflow
- Capture baseline data: Save stored/pending/permanent codes, freeze-frame information, Mode $06$ misfire counts, fuel trims, and readiness status before clearing anything.
- Resolve misfires immediately: Replace overdue plugs, swap coils, check injector balance, and verify compression to protect catalysts and cylinder walls.
- Address fuel trim/catalyst issues: Repair intake or exhaust leaks, then graph O2 sensors and trims during a highway drive to confirm normal operation.
- Verify oil pump control: For P06DD/P06DE, attach a mechanical gauge, confirm hot idle pressure (≥20 psi) and 3,000 rpm pressure (≥45 psi), and inspect wiring for abrasions.
- Troubleshoot stop/start codes: Test both batteries, inspect ground straps, apply PCM/TCM updates, and perform stop/start relearn after repairs.
- Seal EVAP system if necessary: Command purge closed, smoke-test via service port, repair cracked hoses or ESIM leaks, and clear codes once confirmed.
- Complete validation drive: Clear codes, drive 50 miles covering city, cruise, and idle segments, then re-scan to ensure no pending/permanent DTCs remain.
Driving Guidance During Diagnosis
- Avoid towing or wide-open throttle when the MIL flashes or the engine runs rough.
- Short trips with EVAP-only codes are acceptable, but complete repairs before inspection deadlines.
- Monitor oil pressure, coolant temperature, and transmission temperature to prevent secondary damage while troubleshooting.
Preventive Maintenance Checklist
- Change MS-6395 0W-20/5W-20 oil and Mopar filters every 6,000 miles to keep the dual-stage pump healthy.
- Replace spark plugs per schedule (100k V6 / 30k V8) and torque coils correctly to avoid tracking.
- Inspect intake manifold gaskets, PCV assemblies, and purge hoses at each service interval.
- Check exhaust manifold studs annually—loose studs commonly trigger catalyst and fuel-trim codes.
- Test both batteries twice a year on stop/start-equipped models; replace weak units proactively.
Frequently Asked Questions
No. Premium fuel will not repair misfires or fuel-trim faults. Diagnose ignition, fuel delivery, or mechanical issues directly.
Do P0430/P0420 mean the converters failed?
Not automatically. Fix misfires and leaks, then run a highway drive. Replace converters only if efficiency stays low afterward.
How long should I drive after repairs?
Drive about 50 miles with mixed conditions. Re-scan to confirm the MIL is off and all readiness monitors are COMPLETE before inspection.
Related Durango Resources
- Fixing the 2016 Durango MIL for earlier calibration notes.
- Transmission troubleshooting for eight-speed units.
- Ignition diagnostics to confirm misfire repairs.