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Home / DTC / P2DB3 — Drive Motor A Temperature Sensor C Circuit Low

P2DB3 — Drive Motor A Temperature Sensor C Circuit Low

Detailed page for trouble code P2DB3.

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P2DB3

Generic P — Powertrain

Drive Motor A Temperature Sensor C Circuit Low

Brand: Generic
Type: P — Powertrain
Views: UK: 9 EN: 16 RU: 8
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Page language: EN

Causes

  • Open circuit in sensor C signal or ground
  • Short to ground in sensor C signal wire
  • Corroded or loose connector at sensor or motor controller
  • Failed temperature sensor (thermistor/NTC or other type)
  • Damage to wiring harness (abrasion, water intrusion)
  • Faulty motor controller/ECU input or internal short

Symptoms

  • Drive system fault lamp or warning message
  • Reduced propulsion or limp/derate mode
  • Drive motor disabled or faulted when attempting to drive
  • Possible restriction of available torque/power
  • Stored freeze frame or logging of low sensor voltage/value

What to check

  • Read and record freeze frame and live data PIDs for motor A temperature sensor C
  • Visually inspect sensor connector and wiring for damage, corrosion, pin push-out, or water
  • Check for related DTCs (other motor temperature sensors, CAN, HV system faults)
  • Measure sensor output voltage at connector with ignition/drive system in required state (refer to service manual)
  • Measure sensor resistance at ambient temperature (with HV system isolated and vehicle safe)
  • Perform continuity check from sensor connector to motor controller pin and check for shorts to chassis ground and battery rails

Signal parameters

  • Typical sensor interface: 0–5 V analog signal to motor controller (exact range depends on manufacturer)
  • Expected behavior: voltage increases or decreases with temperature depending on sensor type (NTC thermistor usually shows decreasing resistance with increasing temp)
  • Common inactive/low-fault threshold: near 0–0.5 V or open-circuit resistance (depends on controller)
  • Typical thermistor resistance at 25°C often in the 1–100 kΩ range (manufacturer-specific)
  • Controller reports temperature PID for Motor A Sensor C; compare to other motor temperature sensors for plausibility

Diagnostic algorithm

  1. Review stored freeze frame data, freeze PID values and any related DTCs before performing tests
  2. Ensure proper safety procedures for high-voltage systems; disable HV and remove service plug where applicable
  3. Visually inspect the sensor and harness at the motor for physical damage, corrosion, or contaminated connectors
  4. Reconnect vehicle, power system (if required for sensor reading) and backprobe the sensor signal and ground at the connector; record voltage with sensor at ambient temperature
  5. If voltage is below expected range, isolate sensor by disconnecting at the motor controller and measure open-circuit voltage provided by controller (if the controller provides a pull-up)
  6. Measure sensor resistance at the sensor body (with circuit isolated): compare to expected resistance chart in service data; unusually high resistance or open indicates failed sensor
  7. Perform continuity test from the sensor connector to the motor controller pin; check for short to chassis ground and to battery rails
  8. If wiring and sensor check OK, swap in a known-good sensor (if available) or replace sensor and retest
  9. If fault remains after sensor/wiring replacement, suspect motor controller input circuit; inspect for internal faults and consult manufacturer service documentation for controller replacement or repair
  10. Clear DTC and perform a road/drive cycle or commanded test to confirm the fault does not return

Likely causes

  • Broken/abraded signal wire to temperature sensor C
  • Water-corroded connector at the motor sensor pigtail
  • Failed temperature sensor element (NTC open or out-of-spec)
  • Short to ground in sensor harness near motor
  • Motor controller input circuit fault

Fault status

⚠️ Status
Drive Motor A Temperature Sensor C Circuit Low — sensor signal is below expected range or shorted to ground; causes monitoring of motor temperature to be unreliable.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P2DB2 P2DB0 P2DB1 P0A7A P0A7B
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