Powertrain, generic (extended)

P2DB4 Drive Motor A Temperature Sensor C Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2DB4 is the open-circuit side of sensor C: the voltage climbs toward the reference because hardly any current still flows through the thermistor. A broken wire, a terminal backed out of the motor connector, corrosion or a cracked thermistor are the likely finds; a short to a supply voltage is rarer. With an NTC the value shown would be an impossibly cold winding. For the W-phase probe of the same Mitsubishi (sensor 3, own code P3055) the limit is likewise 4.93 V held half a second with at least 8 V at the power drive unit, and the repair path ends with a new power drive unit or front motor. The UAES patent places the upper limit just below supply voltage. No manufacturer documents P2DB4 itself. P2DB3 is the low side, P2DAF the same fault on sensor B.

Likely causes

Open signal or ground lead of sensor C
Terminal backed out or corroded in the motor connector
Thermistor open inside the stator
Signal lead shorted to a supply voltage

Symptoms

  • Hybrid system warning and check engine light
  • Sensor C reads far below ambient temperature in live data
  • Electric drive power limited

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–4,000
Time1–12 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

drive motor a temp sensor cwiring harnessinverter

Related codes

P2DB1P2DB2P2DB3P2DAFP0A2D

References: law.cornell.edu, mitsubishitechinfo.com, patents.google.com.