P2DB2

Code

Generic P — Powertrain

Drive Motor A Temperature Sensor C Circuit Range/Performance

Brand: Generic

Type: P — Powertrain

Views: UK: 22 EN: 23 RU: 20

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or short in the sensor wiring (open to circuit, short to ground, short to battery/ignition)
Corroded, loose or contaminated connector at the sensor or ECU
Failed temperature sensor (thermistor or sender element out of spec)
Poor ground or high-resistance connection in the sensor circuit
Water ingress, pin damage or physical damage to sensor/harness
Intermittent connection from broken wire or chafed harness

Symptoms

Malfunction Indicator Lamp (MIL) or EV system warning illuminated
Drive motor derate, loss of performance or limp-home mode
Inaccurate or implausible motor temperature displayed in live data
Cooling system or motor management operating abnormally
Intermittent faults that may return or clear with vibration/temperature changes

What to check

Read and record freeze-frame and freeze-data with a scan tool; note conditions when fault set
Pull and inspect the connector at Drive Motor A sensor C and the matching ECU connector for corrosion, bent pins, or water intrusion
Check wiring harness for physical damage, chafing, or recent service work in the area
Monitor live data for sensor C while comparing to other motor temperature sensors (A/B/D) and to expected ambient/motor temperature
Measure continuity between the sensor connector and the ECU pin (check for open/high resistance)
Check for short to battery voltage and short to ground from the sensor signal and reference wires

Signal parameters

Typical sensor type: thermistor (NTC) or sender; consult service manual for exact type
Reference voltage to sensor (if used): commonly 5 V ± 0.5 V (manufacturer specific)
Expected sensor output voltage range: approximately 0.1 V–4.9 V depending on temperature and vehicle; values outside this range indicate short/ open
Typical thermistor resistance example (manufacturer specific): ~10 kΩ at 25 °C (many designs); resistance should decrease as temperature rises for NTC
Open-circuit indication: very high resistance (>> 50 kΩ) or voltage near reference pull-up/high rail; Short indication: near 0 Ω or near ground/0 V
Consult vehicle service data for exact resistance vs. temperature or voltage tables

Diagnostic algorithm

Safety first: follow high-voltage and electrical safety procedures for hybrid/EV systems. Disable high-voltage system if required by the vehicle service manual before touching high-voltage components.
Use a diagnostic scan tool to confirm P2DB2 is present and record freeze frame/live data for Drive Motor A sensors A–D and other related codes.
Visually inspect sensor C connector, wiring, and routing from the motor to the control module. Look for damage, heat exposure, water ingress, or pin corrosion.
With ignition/vehicle state per service manual, back-probe the sensor connector and verify reference voltage and ground presence at the connector. Compare with expected values from service data.
Measure sensor output voltage with the motor at different temperatures (cold and warmed) or apply controlled heat to the sensor while watching live data. Confirm output changes smoothly and is within expected voltage range.
Remove sensor and measure its resistance across the sensor terminals at known ambient temperatures. Compare to manufacturer resistance vs. temperature specification. For NTC, resistance should decrease as temperature rises.
Check continuity between the sensor connector and the ECU input pin; measure resistance and inspect for high-resistance connections. Perform a wiggle test on the harness while monitoring signal for intermittent behavior.
Check for short circuits: measure resistance from signal wire to battery positive and to chassis ground. Repair any shorts or opens found.
If wiring and connectors test good and sensor readings are out of spec, replace the temperature sensor C with a known-good unit and retest.
After repair, clear codes, perform a functional test and road/drive-cycle per manufacturer procedure. Confirm code does not return and that motor temperature behavior is normal.
If fault returns after replacement and wiring checks, consider module input fault and consult manufacturer procedures before replacing control module.