P2E37 code meaning
Battery Charger B Enable Circuit High
What P2E37 means
P2E37 is stored when the enable line of charger B carries more voltage than its commanded state allows, typically because it touches a powered wire or the driver in the commanding module is stuck on. No manufacturer documents P2E37 publicly. The effect differs from P2E36: on an active-high wake line the charger is told to stay awake although no charging is planned. Lear's patent on a wake-by-pilot circuit points out why that hurts, since the charger is meant to sleep together with the whole car to keep the 12 V battery healthy, so a stuck enable can drain it overnight. The control unit may also lose the ability to switch charger B off by hardware. GM's 2016 Volt tables list only the general A-side enable fault P0E61. Low is P2E36, charger A high P0E63.
P2E37 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyHard
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2E37
- 12 V battery discharged after standing
- Charger B fan or pump runs with nothing plugged in
- Charging via charger B disabled
Common causes of P2E37
- Most likelyEnable wire shorted to a 12 V feed
- PossibleEnable driver in the commanding module stuck on
- Less likelyInternal leakage in the charger B input circuit
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
On board chargerWiring harness
What each part of P2E37 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 37 | The exact fault in that area. |
What to do next
- Note P2E37 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 P2E37
What does P2E37 mean?
P2E37 means "Battery Charger B Enable Circuit High". P2E37 is stored when the enable line of charger B carries more voltage than its commanded state allows, typically because it touches a powered wire or the driver in the commanding module is stuck on. It is a generic code, so it means the same on every make.
Is it safe to drive with P2E37?
P2E37 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P2E37 fail an emissions test?
P2E37 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 P2E37 to fix?
Difficulty: hard. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P2E37 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.