P1438
A/C Evaporator Air Temperature Circuit Range/Performance
P1438 is an OBD-II diagnostic trouble code meaning: A/C Evaporator Air Temperature Circuit Range/Performance. Common causes: evaporator temperature sensor malfunction, open or short circuit in the sensor circuit. Estimated repair cost: $17–56.
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
FAQ
What does the P1438 code mean?
P1438 is an OBD-II diagnostic trouble code that indicates: A/C Evaporator Air Temperature Circuit Range/Performance
What causes a P1438 error code?
The most common causes of P1438 include: Evaporator temperature sensor malfunction; Open or short circuit in the sensor circuit; Poor contact in the sensor connector; Contact corrosion.
How do I fix a P1438 diagnostic trouble code?
To fix P1438: Check the resistance of the evaporator temperature sensor. Inspect the wiring harness and connectors for damage. Clean contacts from corrosion. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P1438?
Yes, but get it checked soon
How much does it cost to fix P1438?
The estimated repair cost for P1438 is $17–56. Actual cost depends on your vehicle, location, and labor rates.
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