Lost Communication With A/C Refrigerant Pressure Sensor “B”

Where it lives

For U0628, the description names the sensor as the part involved.

Check these first

• The bus cannot reach A/C refrigerant pressure sensor B
• A chafed signal wire at the sensor B connector
• A corroded terminal in the sensor B plug
• Loss of the sensor B ground
• An internal fault in refrigerant pressure sensor B

What to do next

1. Scan refrigerant pressure sensor B live data
2. Inspect the sensor B wiring for chafing
3. Check the connector terminals for corrosion
4. Test the sensor B signal circuit
5. Replace refrigerant pressure sensor B if it stays offline
6. Clear the code and retest

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