U0627Lost Communication With A/C Refrigerant Temperature Sensor A
- Generic OBD-II code · Network
- How the car detects it
- Refrigerant temperature matters most where a controller adjusts superheat itself, as with electronic expansion valves and heat pumps; it also guards against overheated discharge gas. U0627 is set once the digital temperature value from sensor A is no longer received. Many suppliers build temperature and pressure into one housing; Sensata, for example, offered such R744 sensors with LIN, PWM or analog output. If U0626 appears at the same moment, the shared plug, LIN line or supply of that combined part is the first suspect; if only U0627 is present, the temperature channel or a separate sensor is more likely. No manufacturer documents U0627 publicly. Depending on the strategy, cooling or heat-pump output drops or stops. Analog equivalents are P0EBC to P0EBF.
- What you may notice
- Reduced cooling or heat-pump output
- Heat-pump mode unavailable, auxiliary heater takes over
- A/C fault message
- Likely causes
- LikelyConnector, LIN line or supply of a combined pressure/temperature sensor faulty
- PossibleTemperature channel or sensor electronics failed
- RareClimate or thermal controller no longer polls the sensor (software or LIN master fault)
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.