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Home / DTC / P0BC4 — Battery for hybrid/electric vehicle - Temperature sensor E - Circuit low

P0BC4 — Battery for hybrid/electric vehicle - Temperature sensor E - Circuit low

Detailed page for trouble code P0BC4.

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P0BC4

LAND ROVER P — Powertrain

Battery for hybrid/electric vehicle - Temperature sensor E - Circuit low

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Short to ground in temperature sensor E signal or power circuit
  • Open circuit or internal failure of the temperature sensor (NTC thermistor)
  • Poor, corroded or disconnected connector at sensor or BMS
  • Chafed or damaged wiring harness in battery area
  • Faulty Battery Management System (BMS) input or module
  • Moisture/contamination causing low-voltage path to ground

Symptoms

  • DTC P0BC4 stored in BMS / powertrain control module
  • Hybrid/EV system may enter reduced power or limp mode
  • Battery charge/discharge behavior limited or unavailable
  • Instrument cluster may show battery/BMS warning light
  • Possible inability to charge or start EV propulsion system

What to check

  • Read and record freeze frame and live data (temperature E raw value / voltage)
  • Confirm presence of other battery temp sensor DTCs (A–D, F etc.)
  • Visual inspection of sensor E connector, wiring harness and battery pack sealing for damage or corrosion
  • Check for water ingress or contamination around the battery and harness
  • Verify high-voltage system is disabled and isolated before any physical checks on the battery pack
  • Measure sensor signal voltage at the BMS connector and at the sensor connector (with proper safety/isolation procedures)

Signal parameters

  • Sensor type: typically NTC thermistor (resistance changes with temperature)
  • Expected signal: nominal 0.5–4.5 V (varies by manufacturer) — 'Circuit low' usually near 0 V
  • Resistance: commonly in the kilo-ohm range at ambient temperature (e.g., ~2–100 kΩ depending on sensor and temp)
  • Fault condition: voltage near 0 V or resistance infinite/very high indicating short to ground or open circuit

Diagnostic algorithm

  1. Read and record the DTC and any related codes; capture freeze-frame and live data values for sensor E.
  2. Observe live data for temperature E. If the reading is stuck at an extreme low or shows 0 V, proceed with wiring checks.
  3. Disable and isolate the high-voltage system following manufacturer procedures. Do not access HV components unless certified.
  4. Visually inspect the sensor E connector, pins and wiring along the harness for damage, corrosion, chafing, or signs of moisture.
  5. With the system safely isolated, disconnect the sensor E connector and measure resistance of the sensor across its terminals. Compare to manufacturer specification (if unknown, check for reasonable resistance vs. temperature behavior).
  6. Measure for short to ground: with sensor disconnected, check continuity between the signal wire and chassis ground. A direct short indicates wiring damage.
  7. Back-probe at the BMS connector (if safe and allowed) and verify the reference voltage and signal voltage for sensor E — confirm whether voltage is low at the BMS pin or only at the sensor end to isolate section of circuit.
  8. If wiring is faulty, repair or replace harness/connector and protect against future abrasion or moisture. If sensor is out of spec, replace sensor E.
  9. After repairs, clear codes, re-enable HV system per procedures, and re-check live data and perform functional test / drive cycle to confirm the fault does not return.
  10. If the fault persists after wiring and sensor replacement, suspect BMS module fault and escalate to module testing or replacement per manufacturer diagnostics.

Likely causes

  • Damaged/shorted wiring between sensor E and the BMS
  • Failed temperature sensor E (thermistor open or short)
  • Poor connector contact or corrosion at the sensor or BMS connector
  • Moisture intrusion in battery pack connector area

Fault status

⚠️ Status
Battery pack temperature sensor E circuit low voltage — possible short to ground, open/failed sensor, or poor connector.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

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413

Browse 413 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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