Dodge Caliber Check Engine Light Overview
The 2007-2012 Dodge Caliber tends to illuminate the check engine light when the PCM detects a fault in the emissions, ignition, or CVT drivetrain systems. Use this refreshed guide to match DTCs with symptoms, confirm root causes, and keep the warning lamp from coming back.
- Platform coverage: 2.0L/2.4L World Engines with Jatco CVT2 (plus 2010+ 6-speed auto).
- High-frequency faults: EVAP leaks, ignition coil failures, throttle body carbon, oil pressure sensor faults.
- Recommended tools: OBD-II scanner, smoke machine or EVAP tester, multimeter, basic hand tools.
Most Common Caliber OBD-II Codes
| Code | Symptoms | Likely Cause | First Actions |
|---|---|---|---|
| P0420 | Poor fuel economy, sluggish acceleration | Low catalyst efficiency, lazy O2 sensor | Compare upstream/downstream O2 waveforms, inspect for exhaust leaks. |
| P0301-P0304 | Rough idle, misfire under load | Failing ignition coils, worn plugs, injector issues | Swap coils, inspect plug gaps, run injector balance test. |
| P2017 | Low-end power loss, hesitation | Intake manifold runner control (IMRC) sensor or mechanism | Check IMRC actuator for carbon buildup, verify linkage operation. |
| P0456 | Small EVAP leak warning | Loose gas cap, cracked purge/vent hose | Install OEM fuel cap, run smoke test on EVAP lines. |
| P0520 | Oil pressure warning or limp mode | Faulty oil pressure sensor, wiring fault | Test sensor resistance, inspect connector per TSB 18-034-08. |
Model-Year Callouts
- 2007-2009: Dirty electronic throttle bodies can trigger P2110/P2101. Clean the throttle body and perform an idle relearn.
- 2010-2012: CVT-equipped models see P0741/P0700 if fluid is low or software outdated. Verify ATF+4 level and check for TCM flashes.
- SRT4: Boost leaks after modifications often set P0299 (underboost). Pressure test the charge system before replacing the turbo.
Diagnostic Flow
- Pull codes & freeze frame: Record coolant temp, load, STFT/LTFT, and vehicle speed when the fault set.
- Baseline checks: Inspect battery voltage, TIPM fuses/relays, air filter, and vacuum hoses.
- Fuel/ignition: Track fuel trims, swap coils or plugs for cylinder-specific misfires, verify injector pulse with a noid light.
- Emissions systems: Smoke test EVAP lines for P04xx, check catalyst temp delta for P0420, confirm O2 sensors switch properly.
- Software/adaptives: After repairs, clear adaptives, update PCM/TCM when available, and drive until monitors complete.
Resetting the Light
- OBD-II clear: Issue Mode $04$ after the fix and confirm readiness monitors; expect 60-120 km for EVAP to rerun.
- Battery disconnect: Only if a scan tool is unavailable; resets adaptive memory and radio presets.
- Flashing MIL: Indicates active misfire. Stop driving immediately to protect the catalyst and arrange a tow.
Preventive Maintenance
- Inspect plugs and ignition coils every 10,000 miles; replace gaskets if oil intrudes into plug wells.
- Service CVT fluid and filters every 30,000 miles with ATF+4 and reset CVT adaptives.
- Check EVAP hoses and fuel cap annually to avoid P0456 recurrences.
- Test battery/charging system before winter; low voltage can trigger PCM sensor faults.
Frequently Asked Questions
Does P0420 always mean the catalytic converter is bad?
Not always. Rule out exhaust leaks and rich conditions first. If O2 waveforms are normal and inlet/outlet catalyst temps differ by less than 100 F, replacement is warranted.
Can CVT faults trigger the check engine light?
Yes. P0700 combined with P0730-range codes indicates the TCM requested a warning. Verify ATF pressure and inspect wiring before condemning the CVT.
I replaced the gas cap and P0456 still returns. What next?
Perform a smoke test. Focus on the top-of-tank hoses and the EVAP canister vent near the rear suspension; corrosion around the TIPM can also cause false leak readings.
More Caliber Help
Chasing ignition faults? Read the no-spark diagnostic guide. Transmission complaints? Visit the Dodge transmission troubleshooting guide.