P05B8Restraint Deployment Signal Circuit/Open
- Generic OBD-II code · Powertrain
- How the car detects it
- After a crash the restraint control module tells the engine module that airbags or belt tensioners have fired; the engine module then cuts the fuel pump (Ford: until the ignition is cycled) and possibly the engine. Depending on the maker the message travels over CAN and/or a dedicated wire with a defined level or voltage drop. P05B8 means the wired signal line is open – no valid rest level arrives. After a real crash the fuel cut-off may then not be triggered via this line. No manufacturer document available to us uses this code; it is a safety function, not an emission-relevant monitor, so usually without warning lamp.
- What you may notice
- Code stored, driving usually normal
- Possibly message that fuel cut-off is unavailable
- No check engine light
- Likely causes
- LikelySignal wire or connector between restraint and engine module open (e.g. after accident repair or seat removal)
- PossibleCorroded or spread pin at either module
- PossibleReplacement module not configured
- RareRestraint module output stage
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.