U0605Lost Communication With A/C Refrigerant Sensor A
- Generic OBD-II code · Network
- How the car detects it
- The air conditioning controller needs refrigerant pressure or temperature to run the compressor and protect the circuit. Where this information comes over a serial link such as LIN, a single master polls the slave and expects an answer in a fixed schedule; U0605 means refrigerant sensor A no longer answers properly. Mazda shows a broader use: for the 2025 CX-70 and CX-90 plug-in hybrids, bulletin 07-002-26b assigns U0605 in the PCM to a LIN communication error between the electric A/C compressor and the PCM, often with P0D6D after an internal compressor short has blown the high-voltage A/C fuse; the fix is an updated compressor. U0626 and U0627 name dedicated pressure and temperature sensors. Usually the A/C stops cooling.
- What you may notice
- A/C does not cool
- Compressor switched off by the controller
- Likely causes
- LikelyOpen or shorted LIN, supply or ground wire to the sensor
- PossibleRefrigerant sensor electronics failed
- PossibleElectric compressor shorted internally, high-voltage A/C fuse open (Mazda PHEV)
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.