P2E8BProximity Detection Circuit B Intermittent/Erratic
- Generic OBD-II code · Powertrain
- How the car detects it
- P2E8B describes a plug-detection signal on circuit B that drops out or jumps for moments, so the car sees a connector appear and vanish although nobody touched it. The consequences follow from the purpose of the line: under SAE J1772 the proximity state is what lets the vehicle stop drawing current before the plug is released and block driving off while connected, so a flickering signal can end charging for no visible reason or let a drive lock come and go. In Lear's patented design the same line also wakes the charger, so glitches can rouse it needlessly. No manufacturer documents P2E8B. Mercedes describes the classic cause for circuit A on the smart with 22 kW charger: loose low-voltage plugs that act up only with warm or cold parts, alongside P0D5800/P0D5900. Hard faults are P2E89/P2E8A.
- What you may notice
- Charging stops and restarts at random
- Cable-connected message appears and disappears
- Fault more frequent at the start or end of charging
- Likely causes
- LikelyLoose low-voltage connector on the proximity line
- PossibleWorn proximity contact in inlet B or on the cable plug
- PossibleChafed wire with intermittent contact to ground
- RareMoisture in the inlet after rain or washing
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.