Powertrain, generic (extended)

P2E85 Battery Charger B Input Voltage Sensor Circuit Low

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P2E85 means the input voltage signal of charger B sits too low, so the car sees little or no grid voltage while it expects AC. GM uses the code on its battery-electric models, from the 2017 Bolt EV to the Lyriq, Hummer EV, Blazer, Equinox and Silverado EV and BrightDrop vans, under the wording input voltage sensor circuit low voltage. Bulletin PIT6353 and TechLink March 2025 name a typical trigger: a DC-only NACS adapter used at a household outlet or AC wallbox, which routes the shared pins to the DC contacts, so no AC reaches the charger; P0D3F, P0F71 and on the Bolt P1EE6 may set with it. A 2026 TechLink lists P0E8B-11 beside it. With the right adapter the fault is gone; otherwise check inlet, wiring and the charger. Too high is P2E86.

Likely causes

DC-only NACS adapter used on an AC charger
Charging station or house circuit not delivering AC voltage
Open or high-resistance AC path between inlet and charger B
Sensing circuit inside charger B shorted to ground

Symptoms

  • Vehicle does not charge on a Level 1 or Level 2 AC charger
  • DC fast charging works without the adapter problem
  • Further charger codes such as P0D3F or P0F71 stored

Repair estimate

DifficultyMediumDIY possible
Parts and labour€0–2,500
Time0.2–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

battery charger b input voltage sensorwiring harnesson board charger

Related codes

P0E8BP2E84P2E86P0D3FP0E86

References: static.nhtsa.gov, gm-techlink.com, gm-techlink.com, mitsubishitechinfo.com.