U030ASoftware Incompatibility With Evaporative Emission System Leak Detection Control Module
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- In some evaporative systems a dedicated module with its own pump or valve, pressure switch and electronics runs the leak test. U030A means that controller has found the module's software or calibration not to fit. No manufacturer documents U030A publicly. Kia's 2017-2019 Niro hybrid uses such a natural vacuum leak detection unit: its lost-communication code U029F00 lit the MIL, and bulletin PS593 traced it to a damaged signal wire at the NVLD connector. Ford's 2014 code interpretation gives U029F the MIL marker as well. CARB demands the leak monitor, so a mismatch that blocks or falsifies it is emission-relevant and a MIL is probable. The car drives normally; the EVAP readiness flag may remain incomplete, which can fail an inspection. U029F is the lost-contact code.
- What you may notice
- MIL on, usually without any drivability change
- EVAP readiness monitor not completed
- Further EVAP leak test codes may follow
- Likely causes
- LikelyLeak detection module replaced with a unit of another part number
- PossibleEngine controller reprogrammed with a calibration that expects other module software
- RareDamaged signal wire corrupting the identification exchange
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.