P0C94

Code

Generic P — Powertrain

Hybrid/EV Battery Temperature Sensor K Circuit Low

Brand: Generic

Type: P — Powertrain

Views: UK: 30 EN: 37 RU: 31

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Page language: EN

Causes

Short to ground on the temperature sensor signal circuit
Failed/shorted battery temperature sensor (Sensor K)
Corroded, damaged or poorly connected sensor connector or wiring
Faulty reference/pull-up supply from the hybrid/EV control module
Internal fault in the hybrid/EV control module (rare)

Symptoms

Hybrid/EV system warning or malfunction indicator lamp illuminated
Possible restricted charging or reduced system performance (limp mode)
Incorrect or absent battery temperature readings in live data
Battery thermal management (cooling/heating) operating abnormally

What to check

Read stored DTCs and freeze-frame data; capture live sensor values and battery pack temperature readings
Visually inspect the sensor connector and wiring for damage, corrosion, or water intrusion
Check for related codes that indicate supply/reference or ground issues
Measure signal voltage at the sensor connector with ignition ON (key ON, vehicle stationary)
Disconnect the sensor and measure sensor resistance across its terminals (compare to OEM spec or typical NTC values)

Signal parameters

Reference/pull-up voltage typically supplied by the control module: ~5 V (verify OEM spec)
Expected sensor signal voltage: generally in the range ~0.2–4.8 V depending on temperature (exact range is vehicle-specific)
Fault/low threshold: signal markedly below expected range (example:
Common NTC thermistor example: ~10 kΩ at 25 °C (verify against manufacturer data)

Diagnostic algorithm

Verify code and any related DTCs with a scan tool; record freeze-frame and live data for the battery temperature sensor K circuit.
Visually inspect the sensor connector, wiring harness and routing for physical damage, abrasion, pin corrosion, water ingress or crushed wires.
With ignition ON (vehicle parked), backprobe the sensor signal and measure voltage relative to chassis ground. Note the value and compare to expected values. A very low or 0 V reading suggests a short to ground or lost reference.
Turn OFF ignition and disconnect the sensor. Measure resistance of the sensor across its terminals with a multimeter at ambient temperature. Compare to OEM spec (if NTC type, expect a finite resistance — e.g., ~10 kΩ at 25 °C as a common example).
Check continuity between the sensor signal pin and the hybrid/EV control module input. Measure for unintended continuity to ground (short) or open circuits. Repair wiring as needed.
Wiggle/operate the connector and harness while observing live data or multimeter to check for intermittent faults.
If wiring and connector check good and sensor resistance is out of spec, replace the battery temperature sensor K and re-test.
If the fault remains after replacing sensor and repairing wiring, verify the reference/pull-up voltage at the control module. If reference is missing or incorrect, investigate control module power/ground and fuses.
If all hardware and supplies are correct and the fault persists, consult OEM guidance; suspect internal control module fault and consider module testing/repair.