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Home / DTC / P2DB0 — Drive Motor A Temperature Sensor B Circuit Intermittent

P2DB0 — Drive Motor A Temperature Sensor B Circuit Intermittent

Detailed page for trouble code P2DB0.

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P2DB0

Generic P — Powertrain

Drive Motor A Temperature Sensor B Circuit Intermittent

Brand: Generic
Type: P — Powertrain
Views: UK: 11 EN: 22 RU: 12
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Page language: EN

Causes

  • Damaged, corroded or loose connector at the temperature sensor
  • Broken, chafed, pinched or shorted wiring in the harness between sensor and controller
  • Intermittent internal failure of the temperature sensor (thermistor)
  • Poor ground or reference voltage to the sensor
  • Intermittent control module/input circuit fault or connector issue at the module

Symptoms

  • Intermittent drive motor temperature readouts or sudden jumps to very high/low values
  • Erratic drive motor cooling behavior or fan/heatsink control (if used)
  • MIL/CEL illuminated with P2DB0 stored
  • Possible limp mode or reduced drive torque if controller uses the input for protection
  • Fault may clear temporarily and reappear under vibration or temperature changes

What to check

  • Read freeze frame and occurrence count; note environmental conditions when fault set
  • Scan for related codes (other drive motor temp sensors, reference voltage or communication faults)
  • Visually inspect sensor connector and wiring for corrosion, bent pins, damage or water intrusion
  • Wiggle test wiring and connector while monitoring live temperature sensor data with a scan tool
  • Verify presence and stability of the sensor reference voltage (typically 5 V) at the connector
  • Check sensor ground continuity to chassis/controller ground

Signal parameters

  • Reference voltage present at harness connector (typically ~5 V — consult OEM spec)
  • Signal voltage should be stable and change smoothly with temperature; intermittent dropouts indicate wiring/connector issue
  • Short-to-ground can show signal near 0 V; short-to-battery can show near reference voltage (≈5 V)
  • Open-circuit or broken wire will show very high resistance or no signal (OL/infinite)
  • Many temperature sensors are NTC thermistors: resistance decreases as temperature increases — consult OEM curve for exact Ω @ °C

Diagnostic algorithm

  1. Verify and document DTC, freeze frame data and any related codes. Do not replace parts before diagnostics.
  2. Inspect sensor connector and wiring for obvious damage, corrosion, water, or loose pins. Repair any damage.
  3. Backprobe the sensor connector and confirm reference voltage, signal voltage and ground with key ON (engine/vehicle per service doc).
  4. With a scan tool, monitor live temperature sensor B signal while performing a wiggle test on harness and connector to try to reproduce the intermittent symptom.
  5. If intermittent signal appears, isolate section of harness (repair/replace connector, pigtail, or harness segment) and retest.
  6. If no intermittent found, measure sensor resistance at known ambient temperature and compare to OEM resistance/temperature chart. If out of spec, replace sensor.
  7. Check continuity and resistance to controller pin to rule out internal breaks; repair wiring as needed.
  8. If wiring and sensor check good, inspect controller connector and ground. Consider swap/bench-test controller input only if supported by OEM procedures.
  9. After repairs, clear codes, perform validation drive or reproduce conditions that originally set the code, and confirm fault does not return.

Likely causes

  • Loose or corroded sensor connector
  • Wiring harness abrasion or intermittent short to ground/power
  • Failed temperature sensor (intermittent internal open/short)
  • Poor ground or weak 5 V reference from controller
  • Intermittent/module input fault (less common)

Fault status

⚠️ Status
Intermittent circuit fault detected: Drive Motor A Temperature Sensor B. Possible open/short/poor connection or intermittent sensor failure. Inspect connector and harness, verify reference and ground, monitor live data to reproduce.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.5 hours

Similar codes

P0117 P0118 P0119 P2DA0 P2DB1
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