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DTC codes / P0Exx · Hybrid propulsion / P0E8B

P0E8BBattery Charger B Current Sensor Circuit Range/Performance

P0E8B indicates that the powertrain control module has detected an out-of-range or performance fault in the current sensor circuit for battery charger B, which is typically the auxiliary or high-voltage battery charging system on hybrid and electric vehicles. The computer monitors the sensor's signal and flags the code when the reported current does not match expected values under the operating conditions.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaHybrid propulsion

Symptoms you may notice

  • Illumination of the check engine light or service vehicle soon message
  • Often no symptoms besides the warning light
  • Reduced or disabled charging of the auxiliary battery
  • Electrical accessories behaving erratically or dimming lights
  • Possible no-start condition if the auxiliary battery is not being charged
  • Hybrid or electric vehicle may enter a reduced power mode

Common causes, most likely first

  1. Faulty current sensor on the battery charger B circuit
  2. Damaged or corroded wiring or connector at the current sensor
  3. Poor ground connection for the current sensor or charger module
  4. Failed battery charger B module or internal sensor fault
  5. Software calibration issue in the control module
  6. Open or short circuit in the sensor signal circuit
  7. Aftermarket electrical accessories interfering with the sensor signal

How to diagnose and fix it

  1. Connect a scan tool and record all stored codes and freeze-frame data to verify P0E8B is current
  2. Visually inspect the current sensor, its connector, and related wiring for damage, corrosion, or loose pins
  3. Measure sensor reference voltage and ground at the connector to confirm the circuit is intact
  4. Check for technical service bulletins or software updates for the battery charger control module
  5. Perform a voltage drop test on the charging circuit and sensor ground to rule out resistance issues
  6. If the circuit tests good, substitute a known-good current sensor and clear the code to see if it returns
  7. If the code persists after sensor replacement, diagnose or replace the battery charger B module as needed

Current sensor faults that mimic charger failure

  • A loose or corroded ground at the current sensor can produce the same out-of-range signal as a failed sensor, so always check grounds before replacing parts.
  • On some hybrid vehicles, a weak 12-volt auxiliary battery can cause erratic current sensor readings and set P0E8B even though the high-voltage charger is fine.
  • Aftermarket accessories wired directly to the battery can introduce electrical noise that the current sensor interprets as a fault, so inspect for non-factory wiring.
  • The code does not always mean the charger itself has failed; the sensor circuit or its connector is a more common culprit.
  • Clearing the code without repairing the root cause often leads to a repeat visit, so perform a complete circuit test before resetting.

Can I keep driving with P0E8B?

You can usually drive the vehicle short distances to a repair shop, but avoid long trips or heavy electrical loads because the auxiliary battery may not be charging properly. If the vehicle enters a reduced power mode or the battery warning light illuminates, stop driving and seek service.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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