P2DB0

Code

Generic P — Powertrain

Drive Motor A Temperature Sensor B Circuit Intermittent

Brand: Generic

Type: P — Powertrain

Views: UK: 22 EN: 33 RU: 23

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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

Verify and document DTC, freeze frame data and any related codes. Do not replace parts before diagnostics.
Inspect sensor connector and wiring for obvious damage, corrosion, water, or loose pins. Repair any damage.
Backprobe the sensor connector and confirm reference voltage, signal voltage and ground with key ON (engine/vehicle per service doc).
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.
If intermittent signal appears, isolate section of harness (repair/replace connector, pigtail, or harness segment) and retest.
If no intermittent found, measure sensor resistance at known ambient temperature and compare to OEM resistance/temperature chart. If out of spec, replace sensor.
Check continuity and resistance to controller pin to rule out internal breaks; repair wiring as needed.
If wiring and sensor check good, inspect controller connector and ground. Consider swap/bench-test controller input only if supported by OEM procedures.
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