Dodge Grand Caravan Check Engine Light: Causes, Fixes & FAQs
The Grand Caravan’s PCM tracks fuel, ignition, EVAP and transmission inputs. When the MIL turns on, start with the most common DTCs below, diagnose the fault, and keep the lamp off with regular maintenance.
- Years covered: 2008–2020 Grand Caravan (3.3L/3.6L).
- Initial actions: Scan for codes, save freeze-frame data, check battery voltage and grounds.
- Tools: OBD-II scanner, smoke tester, multimeter, fuel pressure gauge.
Frequent Grand Caravan Codes
| Code | Subsystem | Likely Cause | Fix |
|---|---|---|---|
| P0456/P0457 | EVAP | Loose fuel cap, cracked purge/vent hoses | Install OEM cap, smoke-test EVAP, inspect ESIM module. |
| P0300/P030x | Ignition | Coil or plug failure, intake leak | Swap coils/plugs, check intake for leaks, perform compression test. |
| P0128 | Cooling | Thermostat stuck open | Replace thermostat, bleed cooling system, verify coolant level. |
| P0740/P0732 | Transmission | 62TE torque converter clutch, solenoid pack | Measure ATF level/condition, scan TCM, run Quick Learn. |
Diagnostic Flow
- Record data: Capture DTCs, freeze-frame, fuel trims, Mode $06$ misfire counters.
- Inspect: Check ignition components, EVAP hoses, throttle body and wiring harnesses.
- Test: Smoke-test EVAP, swap coils, verify fuel pressure, clean throttle body.
- Transmission: For 62TE codes, inspect ATF, read TCM data, and perform a relearn.
- Reset & verify: Clear codes with a scanner and drive 30–50 miles to confirm monitors complete.
Frequently Asked Questions
Why does the light come back after refueling?
The EVAP system may have a leak. Replace the gas cap, then smoke-test purge/vent hoses and the ESIM module for cracks.
Is it safe to drive with the light on?
A steady MIL means schedule service soon. A flashing MIL signals an active misfire—reduce throttle and repair immediately to protect the catalysts.
See Also
Read the Charger CEL guide and Transmission troubleshooting for more workflows.