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Home / DTC / P0C90 — Hybrid/EV Battery Temperature Sensor J Circuit High

P0C90 — Hybrid/EV Battery Temperature Sensor J Circuit High

Detailed page for trouble code P0C90.

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P0C90

Generic P — Powertrain

Hybrid/EV Battery Temperature Sensor J Circuit High

Brand: Generic
Type: P — Powertrain
Views: UK: 23 EN: 27 RU: 24
AI status
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Page language: EN

Causes

  • Open or high-resistance in the sensor circuit (broken wire, corrosion, poor pin contact)
  • Sensor element failure (thermistor open or out-of-spec)
  • Short to battery positive or other high-voltage source (pulling voltage high)
  • Faulty connector or pin damaged/contaminated
  • Improperly installed or damaged harness after service
  • BMS or control module input fault or internal wiring fault

Symptoms

  • Hybrid/EV fault warning lamp or BMS warning message
  • Battery charge or discharge restricted or disabled (derate/limp mode)
  • HV battery cooling/heating control operating incorrectly
  • Inaccurate or missing battery pack temperature readouts in diagnostics
  • Possible vehicle reduced performance or charging disabled

What to check

  • Read freeze-frame and live data for battery temperatures and related DTCs
  • Confirm P0C90 is current or stored (pending vs. confirmed) and clear then re-run readiness to reproduce
  • Visual inspection of battery pack harness, sensor connectors, and routing for damage or corrosion
  • Check for service history or recent work that may have disturbed the pack harness
  • Follow all manufacturer high-voltage safety procedures before any physical inspection or testing

Signal parameters

  • Typical temperature sensor type: NTC thermistor (resistance decreases with increasing temperature). Verify type for specific vehicle.
  • Expected unloaded sensor resistance (example): ~1 kΩ–100 kΩ depending on design and temperature; open-circuit indicated by very high resistance (>>100 kΩ)
  • Typical signal voltage with pull-up (example): 0.2–4.8 V depending on temperature and pull-up/reference voltage (often 5 V or vehicle-specific).
  • Circuit-high condition usually = signal voltage near supply voltage (e.g., >4.5 V on a 5 V reference) or resistance high/open
  • Circuit-low condition (for comparison) = near 0 V or very low resistance (short to ground)

Diagnostic algorithm

  1. Safety first: follow manufacturer procedures to isolate and de-energize the high-voltage battery before handling pack wiring or connectors. Use PPE and tools rated for HV if live tests are required.
  2. Retrieve diagnostic data: note freeze-frame, ambient and pack temps, and any related BMS codes (record conditions when code set).
  3. Visual inspection: inspect the J sensor connector, harness, strain reliefs, and routing for physical damage, corrosion, melted insulation, or pin push-out. Repair visible issues.
  4. Backprobe/remove connector (with HV system safe per manual): measure signal voltage at the BMS connector with ignition/diagnostic power applied and sensor connected. A circuit-high fault typically shows voltage near the reference supply.
  5. Check for short to supply: with harness accessible, disconnect the sensor and measure resistance between the signal wire and battery positive (or reference supply) per service manual. A low resistance indicates a short to voltage.
  6. Check for open: measure resistance of sensor element at the harness end (remove sensor or isolate). Compare resistance to expected values for ambient temperature. Very high/open resistance indicates failed sensor or broken conductor.
  7. Wiggle test: with backprobe connected, gently flex harness and connectors to see if the signal changes or DTC reproduces — useful to find intermittent opens.
  8. Repair wiring/connector as required (re-pin, clean, replace harness segment). Replace sensor if sensor resistance is out of specification.
  9. If wiring and sensor test good, test BMS input: verify reference voltage and input behavior per service manual. Replace or reprogram BMS only after excluding wiring/sensor faults.
  10. Clear codes and perform functional test under same conditions that originally set the DTC. Confirm normal temperature readings and monitor for code return.
  11. Document repairs and retest vehicle per manufacturer's relearn/initialization procedures if required.

Likely causes

  • Disconnected or damaged temperature sensor connector at the battery module
  • Broken conductor in the temperature sensor harness (chafing, flex point)
  • Corroded or pushed-out terminal in connector causing open circuit
  • Thermistor element failed open (very high resistance)
  • Short-to-voltage on the sensor signal wire (less common than open)
  • BMS input stage failure (verify after wiring/sensor checks)

Fault status

⚠️ Status
BMS detects battery temperature sensor J circuit voltage above expected range (circuit high). Possible open or short-to-voltage in sensor/harness; charging or thermal control may be limited.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0C91 P0C92 P0C93 P0C95 P0C98
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