P2E4B code meaning
Battery Charger Coupler Temperature Sensor C Circuit Range/Performance
What P2E4B means
P2E4B concerns a sensor C value that is electrically valid yet does not fit the situation, for instance a reading that ignores a heavy charge current, departs from the other inlet sensors or jumps without cause. CARB wants such rationality faults kept under their own code, apart from codes for wiring faults and values beyond the limits. TE Connectivity (US11117478) explains why inlet readings can be off: to keep the sensing circuit isolated, sensors often sit away from the power contact, so they lag behind it and read cooler. No manufacturer documents P2E4B. For the A sensor, GM's PIT5904 on the 2022 Hummer EV and BrightDrop EV600 suspects software or oversized, damaged terminals in heavily used station plugs, and says the test reruns only after about 10 minutes of driving above 2 mph. Hard circuit faults belong to P2E4A, P2E4C and P2E4D.
P2E4B 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 repairAfter a drive cycle
Symptoms of P2E4B
- Charging stops or starts at reduced power, often at busy public stations
- Fault does not reappear until the car has been driven for a while
- Charging warning message
Common causes of P2E4B
- Most likelyWorn or widened terminals in the charging station plug heating the contact unevenly
- PossibleSensor no longer in good thermal contact with its pin
- PossiblePlausibility logic in the charging software too strict, update available
- Less likelyTemperature element drifted from its characteristic curve
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Charge port temperature sensorWiring harnessOn board charger
What each part of P2E4B means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 4B | The exact fault in that area. |
What to do next
- Note P2E4B 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 P2E4B
What does P2E4B mean?
P2E4B means "Battery Charger Coupler Temperature Sensor C Circuit Range/Performance". P2E4B concerns a sensor C value that is electrically valid yet does not fit the situation, for instance a reading that ignores a heavy charge current, departs from the other inlet sensors or jumps without cause. It is a generic code, so it means the same on every make.
Is it safe to drive with P2E4B?
P2E4B does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P2E4B fail an emissions test?
P2E4B 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 P2E4B to fix?
Difficulty: medium. A typical repair takes 0.3 to 3 hours of work. This is a job for a workshop.
Will P2E4B clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.