P0D9DBattery Charger Coupler Temperature Sensor A Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- How the car detects it
- P0D9D is logged when the signal of temperature sensor A in the charging inlet jumps or drops out for short moments instead of failing for good. The sensor sits beside the power pins so the car can cut back or end charging once contact resistance heats them; TE Connectivity patents US10960781B2 and US11117478B2 name thermistors and resistance thermometers for this job. No manufacturer documents P0D9D publicly. A related smart case shows the pattern: with the 22 kW charger, Mercedes blamed inlet sensor codes on loose low-voltage plugs at the charger and warned that the fault may only show up with warm or cold parts. Typical is a session that stops for no clear reason and works again later. Steady circuit, plausibility, low and high faults are P0D99 to P0D9C.
- What you may notice
- Charging stops now and then and resumes on a later attempt
- Charging power reduced for a while without an obvious reason
- Charging fault message that comes and goes
- Likely causes
- LikelySensor wiring between inlet and charger with a loose or chafed contact
- PossibleLow-voltage connector at the on-board charger not fully seated (seen on smart for sibling codes)
- PossibleMoisture or corrosion in the inlet harness connector
- RareTemperature element in the inlet with an internal intermittent break
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.