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Home / DTC / P0E8B — Battery Charger B Input Voltage Sensor Circuit

P0E8B — Battery Charger B Input Voltage Sensor Circuit

Detailed page for trouble code P0E8B.

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P0E8B

Generic P — Powertrain

Battery Charger B Input Voltage Sensor Circuit

Brand: Generic
Type: P — Powertrain
Views: UK: 10 EN: 15 RU: 12
AI status
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Page language: EN

Causes

  • Broken, chafed, or shorted wiring harness for Charger B input voltage sensor
  • Poor or corroded connector at sensor, charger or control module
  • Faulty Battery Charger B voltage sensor or sensor harness
  • Blown fuse or failed relay in charger/measurement circuit
  • High-resistance or poor ground connection
  • Faulty charger control module / powertrain control module (PCM)/EV control module or software fault

Symptoms

  • Malfunction Indicator Lamp (MIL) or charge system warning illuminated
  • Reduced or inhibited charging rate from onboard charger
  • Charging interrupted or fails to start; charge faults reported
  • Stored DTC(s) related to charger or voltage sensing
  • Vehicle may limit charge/discharge power, reducing range or charge capability

What to check

  • Read and record all related DTCs and freeze-frame data with a scan tool
  • Visually inspect wiring and connectors for Charger B input voltage sensor for damage, corrosion, water intrusion, or loose pins
  • Check fuses and relays related to the charger and sensing circuits
  • Backprobe sensor connector and measure signal, reference and ground with a multimeter or oscilloscope
  • Verify continuity and resistance of wires between sensor and charger/PCM; check for shorts to battery positive or ground
  • Perform wiggle test on harness while monitoring signal for intermittent faults

Signal parameters

  • Sensor output: typically a scaled analog voltage into the module (commonly 0–5.0 V range) corresponding to charger/battery input voltage
  • Reference supply: usually ~5 V reference from the control module (verify present)
  • Signal ground: near 0 Ω continuity to chassis/control module ground
  • Expected idle signal: depends on pack/charger design — signal should change smoothly with charger/battery voltage; open circuit often reads >4.9 V or 0 V if shorted (verify with vehicle-specific data)
  • No excessive noise or intermittent dropouts on the signal (use scope if available)

Diagnostic algorithm

  1. Connect a capable scan tool and note P0E8B and any related codes; capture freeze frame and live data for Charger B input voltage
  2. Visually inspect sensor, charger and wiring harness for obvious damage, corrosion or water ingress; repair as needed
  3. Check fuses/relays supplying the charger and sensing circuits; replace any blown fuses and retest
  4. With ignition/charge system in the state required by manufacturer (Key ON or charging state), backprobe the sensor connector and measure: reference voltage (expect ~5 V), signal voltage (should be within expected scaled range), and ground continuity
  5. Compare sensor signal voltage to actual charger/battery input voltage (if accessible). The sensor output should scale proportionally — if not, suspect sensor or wiring
  6. Perform continuity/resistance checks between sensor pins and the control module to find opens or shorts; repair wiring or connectors if values are out of spec
  7. If wiring and connectors are good but signal is incorrect or intermittent, replace the Battery Charger B input voltage sensor (or the charger module if the sensor is integral)
  8. If fault persists after replacement, consider replacing or reprogramming the charger control module/PCM only after confirming proper wiring and sensor operation
  9. Clear codes and perform a full charge cycle and functional test; confirm code does not return and that charging performance is normal

Likely causes

  • Loose/corroded connector at Battery Charger B voltage sensor or charger
  • Damaged wiring between sensor and control module (open or short to power/ground)
  • Failed input voltage sensor in charger B
  • Blown fuse or failed relay feeding the sensor/reference circuit
  • Fault in charger control module or PCM (least likely after wiring/sensor checks)

Fault status

⚠️ Status
Control module detected an abnormal signal from the Battery Charger B input voltage sensor circuit (open, short, out-of-range, or intermittent). Charging may be reduced or disabled until the fault is corrected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.5 hours
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