U0629

Lost Communication With A/C Refrigerant Temperature Sensor B

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–56 (est.)

Symptoms

Air conditioning system not working
Increased temperature in the cabin
Error indication on the instrument panel
Unstable climate control operation

Causes

Open or short circuit in the sensor circuit
Oxidized or damaged connector pins
Faulty refrigerant temperature sensor B
Wiring Harness Problems
Malfunction of the climate control control unit

How to Fix

Diagnose the electrical circuit of the sensor
Check the condition of connectors and contacts
Test coolant temperature sensor B
Replace sensor if necessary
Check the operation of the air conditioning system after repair

Related codes

U0628 U0630 U0631