2000 Dodge Caravan Check Engine Light Guide
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The first-generation OBD-II Caravan logs ignition, fuel, and emissions faults that you can diagnose at home. This guide covers the most common codes, troubleshooting steps, and preventive maintenance—all in English.
- Applies to: 2000 Caravan and Grand Caravan with 3.0L, 3.3L, or 3.8L engines.
- Tools: OBD-II scanner, smoke machine, DVOM, fuel pressure gauge, compression tester.
- Warning: A flashing MIL indicates severe misfire. Reduce load immediately to protect the catalytic converter.
Common Caravan Codes
| Code | Subsystem | Likely Cause | First Checks |
|---|---|---|---|
| P0300/P030x | Ignition/Fuel | Spark plugs, wires, distributor cap/rotor (3.3L/3.8L), injector imbalance | Inspect plugs/wires, replace cap/rotor, perform compression test. |
| P0171/P0174 | Fuel Trim | Intake leaks, weak fuel pump, dirty injectors | Smoke-test intake, inspect vacuum lines, measure fuel pressure. |
| P0455/P0456 | EVAP | Loose fuel cap, cracked purge/vent hoses, LDP failure | Check fuel cap seal, smoke-test EVAP system, inspect leak detection pump. |
| P0123/P0222 | TPS | Throttle position sensor circuit high/low | Inspect TPS wiring, test sensor sweep with DVOM, adjust or replace TPS. |
| P0132/P0152 | O2 Sensor High Voltage | Shorted O2 wiring or rich mixture | Inspect harness near exhaust, monitor sensor voltage, check fuel trims. |
Diagnostic Workflow
- Record data: Capture stored/pending/permanent DTCs, freeze-frame data, and fuel trims before clearing.
- Ignition/fuel checks: Replace plugs and wires, inspect distributor components, clean throttle body, and verify injector operation.
- Seal vacuum/EVAP leaks: Smoke-test the intake and EVAP system; repair hoses, purge valves, and leak detection pumps.
- Verify sensors: Monitor O2, TPS, and MAP sensor signals for proper range; replace faulty sensors and reset adaptives.
- Corresponding mechanical tests: Perform compression/leak-down if misfires persist to rule out valve or head-gasket issues.
- Validation drive: Clear codes, drive 50 miles with city/highway mix, and re-scan to ensure monitors are COMPLETE.
Preventive Maintenance Tips
- Change oil every 3,000–5,000 miles to protect valvetrain components.
- Replace spark plugs, wires, and distributor cap/rotor every 30,000 miles.
- Inspect vacuum and EVAP hoses annually for cracking, especially in cold climates.
- Keep the throttle body and IAC passages clean to maintain smooth idle.
- Test battery/charging system twice per year; low voltage causes random sensor faults.
Frequently Asked Questions
Can I clear the light before fixing it?
No. The PCM reruns diagnostics and the MIL returns if the fault remains. Repair the issue first.
No. Misfire and fuel-trim codes require ignition, fuel, or mechanical repairs—not higher octane fuel.
How long should I drive after repairs?
Drive about 50 miles with city/highway segments to confirm readiness monitors and pass inspection.