P0619Alternative Fuel Control Module RAM/ROM Error
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- CARB treats gas-fuelled vehicles (CNG, LPG, also the gas mode of bi-fuel cars) like petrol cars up to model year 2018 and under an approved manufacturer plan afterwards. P0619 means the separate alternative fuel module reports an error in its working memory (RAM, read/write test) or program memory (ROM/flash, checksum) – one code for both, while the engine module uses P0604 and P0605. No manufacturer was found that uses the code; Roush's Ford propane systems report gas module failures as U0108 and the engine module's own memory errors as P0604/P0605. A module whose memory cannot be trusted will typically shut down gas operation: bi-fuel cars run on petrol, dedicated gas engines may not start. The usual remedies are reprogramming the gas module with a stable supply, then replacement.
- What you may notice
- Check engine or gas system warning light
- No gas operation, switch to petrol
- Starting problems on dedicated gas engines
- Possibly communication code U0108
- Likely causes
- LikelyInterrupted or faulty programming of the gas module
- PossibleVoltage dips, supply, ground or corrosion
- PossibleInternal hardware defect (memory chip)
- RareManufacturer software fault
- 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: €100 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.