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Home / DTC / P0BC4 — Hybrid/EV Battery Temperature Sensor E Circuit Low

P0BC4 — Hybrid/EV Battery Temperature Sensor E Circuit Low

Detailed page for trouble code P0BC4.

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22,612specific
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P0BC4

Generic P — Powertrain

Hybrid/EV Battery Temperature Sensor E Circuit Low

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

Causes

  • Short to ground in the sensor E signal or reference circuit
  • Failed/shorted temperature sensor (thermistor) at location E
  • Damaged, corroded, or disconnected connector at the sensor or module
  • Wiring chafe, pinched harness, or water ingress
  • Faulty hybrid control module / battery management module input
  • Intermittent connection or poor ground at module

Symptoms

  • Malfunction Indicator Lamp (MIL) / warning light related to hybrid/battery system
  • Reduced hybrid/EV performance or restricted charge/discharge (limp or reduced power)
  • Battery thermal management (fan/heater/coolant) may run continuously or be disabled
  • Possible stored additional battery pack temperature-related DTCs
  • Inconsistent or implausible temperature readout for sensor E in live data

What to check

  • Read freeze frame and live data for all battery pack temperature sensors; compare sensor E to others
  • Verify safety: follow HV system isolation procedures before touching pack components
  • Visually inspect sensor E, connector, and harness for damage, corrosion, or water
  • Backprobe sensor connector with ignition on and measure signal voltage to ground
  • Measure sensor resistance at pack with sensor disconnected and compare to expected thermistor curve or to a known-good sensor
  • Check continuity between sensor signal pin and module input, and for shorts to chassis ground

Signal parameters

  • Sensor type: thermistor (NTC or PTC depending on vehicle) — resistance changes with temperature
  • Typical interface: analog voltage input to battery management module (0–5 V reference)
  • Low-circuit fault: sensor signal voltage below the module's low threshold (near 0 V) or resistance indicating implausibly low temperature
  • Compare sensor E live value to other pack sensors for plausibility

Diagnostic algorithm

  1. Retrieve codes and freeze frame; note pack state, temps, and conditions when code set.
  2. Observe live data for sensor E and adjacent sensors. If sensor E reads much lower than others, suspect sensor/circuit.
  3. Perform a visual inspection of sensor E, wiring, and connectors for damage, corrosion, or signs of heat/wear.
  4. With vehicle in a safe, de-energized state per manufacturer HV procedures, disconnect sensor E and measure its resistance at ambient temperature. Compare to expected resistance or to another known-good pack sensor.
  5. With ignition ON (vehicle still made safe per HV procedures), backprobe the sensor connector and measure signal voltage. A voltage near 0 V indicates short to ground; an open will show no reference or erratic voltage.
  6. Check continuity between the sensor signal pin and the battery management module input; check for short to chassis ground.
  7. If wiring and connector check good but sensor resistance is out of spec, replace sensor E and clear codes.
  8. If sensor tests good but signal at module is low, inspect/repair harness to module or suspect module input fault; consult manufacturer procedures before replacing module.
  9. After repairs, clear codes and perform functional test/road test and monitor live data to ensure proper operation and that the code does not return.

Likely causes

  • Sensor E damaged or internally shorted (thermistor failed low)
  • Wiring shorted to chassis ground near sensor or along harness
  • Connector corroded or pin pushed out at sensor/module
  • Battery management module input fault (less common)

Fault status

⚠️ Status
Hybrid/EV battery pack temperature sensor E circuit low — the battery management module detected a sensor signal below its valid range (low voltage/low resistance condition).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.0 hours

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Code

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 the sensor E signal or reference circuit
  • Failed/shorted temperature sensor (thermistor) at location E
  • Damaged, corroded, or disconnected connector at the sensor or module
  • Wiring chafe, pinched harness, or water ingress
  • Faulty hybrid control module / battery management module input
  • Intermittent connection or poor ground at module

Symptoms

  • Malfunction Indicator Lamp (MIL) / warning light related to hybrid/battery system
  • Reduced hybrid/EV performance or restricted charge/discharge (limp or reduced power)
  • Battery thermal management (fan/heater/coolant) may run continuously or be disabled
  • Possible stored additional battery pack temperature-related DTCs
  • Inconsistent or implausible temperature readout for sensor E in live data

What to check

  • Read freeze frame and live data for all battery pack temperature sensors; compare sensor E to others
  • Verify safety: follow HV system isolation procedures before touching pack components
  • Visually inspect sensor E, connector, and harness for damage, corrosion, or water
  • Backprobe sensor connector with ignition on and measure signal voltage to ground
  • Measure sensor resistance at pack with sensor disconnected and compare to expected thermistor curve or to a known-good sensor
  • Check continuity between sensor signal pin and module input, and for shorts to chassis ground

Signal parameters

  • Sensor type: thermistor (NTC or PTC depending on vehicle) — resistance changes with temperature
  • Typical interface: analog voltage input to battery management module (0–5 V reference)
  • Low-circuit fault: sensor signal voltage below the module's low threshold (near 0 V) or resistance indicating implausibly low temperature
  • Compare sensor E live value to other pack sensors for plausibility

Diagnostic algorithm

  1. Retrieve codes and freeze frame; note pack state, temps, and conditions when code set.
  2. Observe live data for sensor E and adjacent sensors. If sensor E reads much lower than others, suspect sensor/circuit.
  3. Perform a visual inspection of sensor E, wiring, and connectors for damage, corrosion, or signs of heat/wear.
  4. With vehicle in a safe, de-energized state per manufacturer HV procedures, disconnect sensor E and measure its resistance at ambient temperature. Compare to expected resistance or to another known-good pack sensor.
  5. With ignition ON (vehicle still made safe per HV procedures), backprobe the sensor connector and measure signal voltage. A voltage near 0 V indicates short to ground; an open will show no reference or erratic voltage.
  6. Check continuity between the sensor signal pin and the battery management module input; check for short to chassis ground.
  7. If wiring and connector check good but sensor resistance is out of spec, replace sensor E and clear codes.
  8. If sensor tests good but signal at module is low, inspect/repair harness to module or suspect module input fault; consult manufacturer procedures before replacing module.
  9. After repairs, clear codes and perform functional test/road test and monitor live data to ensure proper operation and that the code does not return.

Likely causes

  • Sensor E damaged or internally shorted (thermistor failed low)
  • Wiring shorted to chassis ground near sensor or along harness
  • Connector corroded or pin pushed out at sensor/module
  • Battery management module input fault (less common)

Fault status

⚠️ Status
Hybrid/EV battery pack temperature sensor E circuit low — the battery management module detected a sensor signal below its valid range (low voltage/low resistance condition).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.0 hours

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P0BC5 P0BC0 P0BC1 P0117 P0118
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LAND ROVER

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