Powertrain, generic · Hybrid propulsion

P0D9B Battery Charger Coupler Temperature Sensor A Circuit Low

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P0D9B means the voltage of coupler temperature sensor A has dropped below its valid window. Low refers to the signal, and what that implies about temperature depends on the element: with an NTC a low voltage stands for an extremely hot reading, whereas the PTC chain and Pt 1000 sensors Phoenix Contact builds into its inlets lose resistance as they cool, so in the usual pull-up wiring a low signal looks implausibly cold. A short to ground drives the signal low with either type. Bentley publishes the code for the 2024 Bentayga Hybrid: TPI 2075291/1 reports that the on-board charger (address 00C6) displays the texts of P0D9B and P0D9C swapped, and confirms that P0D9B is the low fault, so technicians should diagnose by code, not by the displayed wording. No thresholds are public. The high fault is P0D9C.

Likely causes

Sensor signal wire shorted to ground
Moisture or corrosion bridging the sensor contacts in the inlet
Temperature element internally shorted
Diagnosis misled by swapped fault texts in the charger (Bentley)

Symptoms

  • Charging refused or limited
  • Charging system fault message
  • Fault stored as intermittent or static in the charger

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–1,200
Time0.5–3 h

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

Parts involved

charge port temperature sensorwiring harnesson board charger

Related codes

P0D99P0D9AP0D9CP0D9D

References: static.nhtsa.gov, phoenixcontact.com, patents.google.com.