P1227 – Fuel Tank Pressure Too Low
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Symptoms
- Fuel odor
- EVAP monitor not ready
- Check engine light
- Possible rough idle
- Emissions failure
Causes
- Loose fuel cap
- Cracked EVAP hose
- Leaking canister
- Faulty vent valve
- Tank pressure sensor error
Diagnosis
- Inspect fuel cap seal
- Smoke test EVAP system
- Inspect hoses
- Check canister
- Scan tank pressure data
Repair
- Tighten or replace fuel cap
- Repair EVAP hoses
- Replace canister
- Replace vent valve
- Replace pressure sensor