P05FAStop-Start Status Signal Circuit Low
- Generic OBD-II code · Powertrain
- How the car detects it
- A discrete stop-start status line tells the engine module (or another module) whether stop-start is active, inhibited or has just stopped the engine. On most current cars this status travels over CAN instead, so a hard-wired line and these codes are rare; no manufacturer document available to us uses P05F9–P05FB. CARB names stop-start as its example of an 'emissions neutral' reaction: a module that simply disables stop-start when a fault appears may report it without the check engine light, which is what Ford does for its stop-start codes. P05FA means the status line stays below its lower limit – a short to ground or a missing pull-up supply. Stop-start is then disabled.
- What you may notice
- Stop-start does not work
- Stop-start indicator or message in the cluster
- Likely causes
- LikelyStatus line shorted to ground
- PossibleSending module pulls the line to ground permanently (faulty output)
- RareMoisture or corrosion in the connector
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.