P0D9B: Battery Charger Coupler Temperature Sensor A Circuit Low

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.

High severity. Can I keep driving?If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

Symptoms

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

Most 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)

What to check, in order

Start with the simplest. You can tick off each step.

Read the codes with a hybrid-compatible scanner and write down the freeze frame data
With the connector unplugged, check whether the signal wire is making contact with ground.
Make sure the battery cooling air intake is clean
Check the 12 V auxiliary battery, which can also trigger warnings
Leave any high-voltage measurements to a specialized repair shop

Good to know

Repair difficulty: medium

What each character of P0D9B means

P: Powertrain: engine and transmission
0: Generic code: same on every make
D: Subsystem depends on the code range
9B: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0D9B?

If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

What causes code P0D9B?

The most common causes are: sensor signal wire shorted to ground; moisture or corrosion bridging the sensor contacts in the inlet; temperature element internally shorted.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.