OBD Battery Charger A Input Voltage Sensor B Circuit
What it means
P0EF7 stands for Battery Charger A Input Voltage Sensor B Circuit. P0EF7 is a P code, so the fault sits in the engine, transmission and emissions systems. For P0EF7, work through the cause list below, cheapest checks first.
Where it lives
For P0EF7, the circuit described runs through the sensor. The description of P0EF7 reports a fault at the sensor.
What to check first
For P0EF7, check the wiring and connector on this circuit first, since a broken terminal gives the same reading as a failed part.
Check these first
- P0EF7: Faulty or contaminated sensor in the fuel/air metering circuit
- P0EF7: Damaged or shorted wiring or connector for the affected circuit
- P0EF7: Vacuum leak or intake system restriction
- P0EF7: Failing fuel pump, injector, or fuel pressure regulator
What to do next
P0EF7 belongs to the powertrain control system. These are the general steps for P0EF7, and the exact cause on your vehicle can differ.
- P0EF7: Read freeze frame data and related codes with an OBD-II scanner
- P0EF7: Inspect the affected sensor wiring and connector for damage
- P0EF7: Compare live sensor readings (fuel trim, airflow, temperatures) to manufacturer specs
- P0EF7: Smoke test the intake system if lean or vacuum conditions are suspected
- P0EF7: Replace the failed component after confirming it with live data
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Updated
Generic SAE J2012 definition. Last updated 2026-08-30.