U0627

Lost Communication With A/C Refrigerant Temperature Sensor A

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–56 (est.)

Symptoms

Air conditioner doesn't work
The air conditioner is unstable
Hot air from ducts
Check Engine light comes on
Reduced cooling efficiency

Causes

Open or short circuit in the sensor circuit
Refrigerant temperature sensor malfunction
Poor contact in the sensor connector
Wiring harness damage
Air conditioning computer malfunction

How to Fix

Check the integrity of the sensor circuit
Check the resistance of the coolant temperature sensor
Inspect connectors and contacts for corrosion
Check for breaks in the wiring harness
If necessary, replace the coolant temperature sensor

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