P2E74

Code

Generic P — Powertrain

Hybrid/EV Battery Pack Coolant Temperature Sensor D Circuit

Brand: Generic

Type: P — Powertrain

Views: UK: 22 EN: 42 RU: 23

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Read freeze-frame and related codes with a manufacturer-level scan tool; note battery pack temperature values and status bits
Visually inspect sensor D connector, harness and cooling system for corrosion, damage, coolant leaks or kinks
Backprobe sensor connector and monitor live signal while warming/cooling the pack (observe response to temperature change)
Check for presence of reference voltage (typically 5 V) and a good ground at the sensor connector
Measure sensor resistance out of circuit (if NTC type) and compare to specification or expected trend with temperature
Perform continuity checks from sensor connector to control module pin; check for shorts to ground and to battery voltage

Typical signal type: temperature sensor (NTC thermistor) or voltage output; expected signal range commonly 0.1–4.9 V (varies by design)
Common reference: 5 V pull-up from control module (some systems may use other reference voltages)
Expected behaviour: signal voltage decreases or increases consistently with temperature depending on sensor type (NTC decreases resistance as temperature rises; voltage will vary accordingly)
Approximate NTC resistance trend (manufacturer-specific): very high resistance at very low temp, tens of kΩ near 0 °C, a few kΩ near 20–25 °C, and

Safety: follow manufacturer procedures for high-voltage isolation and PPE before accessing battery pack components.
Retrieve data: read P2E74 and any related DTCs, freeze-frame and live battery pack coolant temperature readings with a scan tool.
Visual inspection: inspect sensor D connector, wiring harness, and coolant lines for physical damage, corrosion, or signs of coolant intrusion.
Monitor signal: backprobe the sensor connector and observe signal and reference voltage with the key/ignition in ON (follow HV safety). Verify presence of reference voltage (commonly 5 V) and stable ground.
check for opens/shorts: with ignition OFF, measure continuity from sensor connector pins to the ECU pin and to chassis ground and battery positive to detect shorts or opens.
Resistance test: disconnect sensor and measure resistance across its terminals at ambient temperature. Compare to OEM specification or confirm that resistance changes when sensor is heated/cooled (finger/heat gun or ice — use controlled methods, avoid overheating).