Powertrain, generic (extended)

P2DB0 Drive Motor A Temperature Sensor B Circuit Intermittent

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P2DB0 logs short dropouts or jumps in the sensor B signal that come and go too fast for the steady low and high checks. Because CARB requires circuit monitoring of input components to run continuously, such glitches are caught while driving. No manufacturer documents P2DB0, but Bentley's 2025 bulletin for the 2020–23 Bentayga and Flying Spur hybrids describes the same pattern on sensor A under P0A2E00: at high temperature the crimped joint of the motor temperature sensor shifts its resistance abruptly and the reading spikes. Only the sensor is renewed, yet engine and gearbox must come out to reach it. Heat cycling, vibration and loose terminals along the run from stator to inverter are the usual suspects. Expect a fault that is often heat-related and hard to reproduce on a cold car.

Likely causes

Resistance jumps in the sensor crimp at high temperature
Worn or loose terminals in a connector of the sensor B line
Chafed lead with intermittent contact under vibration

Symptoms

  • Warning light that comes and goes, often after hard driving
  • Sensor B value spikes briefly in live data
  • Electric drive power briefly limited on some models

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€200–5,000
Time2–20 h

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

Parts involved

drive motor a temp sensor bwiring harnessinverter

Related codes

P2DACP2DAEP2DAFP0A2EP2DB5

References: law.cornell.edu, static.nhtsa.gov.