Powertrain, generic (extended)

P2DB5 Drive Motor A Temperature Sensor C Circuit Intermittent

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P2DB5 is set when the sensor C signal drops out or jumps briefly and then recovers – a flickering contact rather than a lasting open or short. No manufacturer documents P2DB5. The closest published case concerns sensor A: Bentley's P0A2E00 bulletin for 2020–23 Bentayga and Flying Spur hybrids traces temperature jumps to a sensor crimp whose resistance changes suddenly when hot, cured by a new sensor rather than a new motor. CARB expects circuit checks on input components to run without pause, which is why even short glitches end up in memory. The warning may disappear for days; testing the harness while the drive unit is warm helps to catch it.

Likely causes

Crimp of sensor C changing resistance when hot
Loose or fretted terminals in the sensor C connector
Lead rubbing through and touching intermittently

Symptoms

  • Warning light that disappears and returns
  • Brief spikes or gaps in the sensor C value in live data
  • Fault mainly after long or hard drives

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 cwiring harnessinverter

Related codes

P2DB1P2DB3P2DB4P2DB0P0A2E

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