P2E8B code meaning
Proximity Detection Circuit B Intermittent/Erratic
What P2E8B means
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.
P2E8B at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.3 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2E8B
- Charging stops and restarts at random
- Cable-connected message appears and disappears
- Fault more frequent at the start or end of charging
Common causes of P2E8B
- Most 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
- Less likelyMoisture in the inlet after rain or washing
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Proximity detection bCharge inlet bWiring harness
What each part of P2E8B means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 8B | The exact fault in that area. |
What to do next
- Note P2E8B and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2E8B
What does P2E8B mean?
P2E8B means "Proximity Detection Circuit B Intermittent/Erratic". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P2E8B?
P2E8B does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P2E8B fail an emissions test?
P2E8B is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P2E8B to fix?
Difficulty: medium. A typical repair takes 0.3 to 3 hours of work. This is a job for a workshop.
Will P2E8B clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.