P1438

A/C Evaporator Air Temperature Circuit Range/Performance

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–56 (est.)

Symptoms

Incorrect operation of the air conditioner
Unstable air temperature in the cabin
The air conditioner may not turn on
The climate control system indicator is flashing
Increased fuel consumption due to constant compressor operation

Causes

Evaporator temperature sensor malfunction
Open or short circuit in the sensor circuit
Poor contact in the sensor connector
Contact corrosion
Malfunction of the climate control unit

How to Fix

Check the resistance of the evaporator temperature sensor
Inspect the wiring harness and connectors for damage
Clean contacts from corrosion
Check the power and ground of the sensor circuit
If necessary, replace the evaporator temperature sensor

Related codes

Error P1438 by Vehicle Brand