2000 Dodge Durango Check Engine Light Codes
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Older Durangos use OBD-II diagnostics to flag ignition, fuel, and emissions faults. This guide explains how to interpret those codes, fix common issues, and confirm the repair in plain English.
- Applies to: 2000 Durango 4×2 and 4×4 models with 4.7L or 5.9L engines.
- Tools: OBD-II scanner, smoke machine, fuel pressure gauge, DVOM, compression tester.
- Warning: A flashing MIL indicates severe misfire. Reduce load immediately to protect the catalytic converters.
Common Durango Codes
| Code | Subsystem | Likely Cause | First Checks |
|---|---|---|---|
| P0300/P030x | Ignition/Fuel | Coils, distributor cap/rotor (5.9L), plugs, injector imbalance | Inspect plugs and wires, swap coils, perform compression test to rule out valve issues. |
| P0171/P0174 | Fuel Trim | Vacuum leaks, weak fuel pump, dirty injectors | Smoke-test intake, inspect vacuum hoses, monitor fuel pressure under load. |
| P0455/P0456 | EVAP | Loose fuel cap, cracked purge/vent hoses, LDP faults | Verify fuel cap seal, command purge closed, apply smoke via EVAP port. |
| P0132/P0152 | O2 Sensor High Voltage | Shorted upstream O2 harness or rich mixture | Inspect wiring near exhaust, monitor sensor voltage and fuel trims, repair mixture issues. |
| P0123/P0222 | Throttle Position Sensor | TPS circuit high/low input | Check TPS connector, test sensor sweep with DVOM; replace if signal drops or spikes. |
Diagnostic Workflow
- Capture baseline: Record DTCs, freeze-frame data, Mode $06$ misfire counts, and fuel trims before clearing.
- Inspect ignition: Replace plugs and wires, inspect distributor components (5.9L), test coils, and confirm spark strength.
- Check fuel delivery: Measure fuel pressure at idle and under load, clean injectors, and inspect the regulator and filter.
- Seal vacuum/EVAP leaks: Smoke-test the intake and EVAP system; repair hoses, PCV lines, and purge valves.
- Validate sensors: Monitor O2, TPS, and MAP signals for proper range and response; replace faulty sensors.
- Confirm repair: Clear codes, drive 50 miles with city/highway mix, and re-scan to ensure readiness monitors are COMPLETE.
Preventive Maintenance Checklist
- Change oil every 3,000–5,000 miles to protect the valvetrain and lifters.
- Inspect spark plugs/wires and distributor components annually; replace as needed.
- Check vacuum and EVAP hoses for cracking, especially in extreme climates.
- Clean the throttle body and idle air control valve to maintain stable idle.
- Test the battery/charging system twice per year; low voltage causes misfire and sensor faults.
Frequently Asked Questions
Can I clear the light before fixing the issue?
No. The PCM reruns diagnostics and turns the MIL back on if the fault remains. Repair the cause first.
No. Misfire and trim codes require ignition, fuel, or mechanical repairs—premium fuel can’t fix them.
How long should I drive after repairs?
Drive about 50 miles with city, cruise, and idle segments to confirm readiness monitors and pass inspection.