OBD-II code · Powertrain (generic)
P05BD Stop-Start Mode Switch Circuit Range or Performance
Same as P05BC with the input in plausible range yet not matching the expected toggle behaviour - typically a worn switch contact.
Is it safe to drive with P05BD?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyContact resistance drifted
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.2 h
- Emissions test
- Usually unaffected
- Parts involved
- Stop Start Switch
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.