U0626Lost Communication With A/C Refrigerant Pressure Sensor A
- Generic OBD-II code · Network
- How the car detects it
- Without a refrigerant pressure reading the climate controller cannot protect the compressor or schedule the condenser fan. When pressure sensor A digitizes its value itself and transmits it as a LIN or SENT frame, U0626 marks that the frame has stopped arriving; which point of the circuit gets the letter A is up to the manufacturer. No manufacturer documents U0626 publicly. Audi illustrates the pattern with its combined sensor G395, which the body module polls as a LIN slave: if the air quality sensor drops out together with it, the shared LIN wire is usually pinched (Audi stores its own codes). The A/C normally shuts down until contact returns. Hardwired sensors report P0530 to P0533 instead, and P2CD4 compares sensor A with B.
- What you may notice
- A/C compressor stays off, no cooling
- A/C fault message or flashing A/C indicator
- Other LIN devices on the same line may also report no communication
- Likely causes
- LikelyLIN wire to the sensor pinched, chafed or cut (Audi documents this for G395)
- PossibleCorroded, loose or pushed-back terminals at the sensor connector
- PossibleSensor supply voltage missing or ground intermittently open
- RareSensor electronics failed, often after moisture or refrigerant leaking at the sensor
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.