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

Where it lives

For U0626, start at the sensor the description names.

Check these first

• The bus loses the A/C refrigerant pressure sensor A signal
• A broken wire in the sensor A circuit
• A loose connector at the refrigerant pressure sensor
• A short to ground in the sensor A harness
• A failed refrigerant pressure sensor A element

What to do next

1. Read A/C refrigerant pressure sensor A on a scan tool
2. Inspect the sensor connector and pins
3. Check the sensor signal and ground circuits
4. Compare the pressure reading against a manifold gauge set
5. Replace refrigerant pressure sensor A if it stays offline
6. Clear the code and retest

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