Engine-Codes.com
Engine-Codes – Generic – P1438

P1438 Code - A/C Evaporator Air Temperature Circuit Range/Performance

Quick Answer

The P1438 diagnostic trouble code (DTC) refers to the A/C Evaporator Air Temperature Circuit Range/Performance. Common causes include Faulty evaporator air temperature sensor: The sensor may be malfunctioning or providing incorrect readings, triggering the P1438 code, Wiring or connector issues: Loose connections or damaged wiring related to the evaporator air temperature sensor can cause communication problems and trigger the code, Refrigerant leak: A leak in the A/C system that affects the evaporator air temperature sensor can lead to the P1438 code. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means
P1438 indicates A/C Evaporator Air Temperature Circuit Range/Performance.
Common causes
Common causes include Faulty evaporator air temperature sensor: The sensor may be malfunctioning or providing incorrect readings, triggering the P1438 code, Wiring or connector issues: Loose connections or damaged wiring related to the evaporator air temperature sensor can cause communication problems and trigger the code, Refrigerant leak: A leak in the A/C system that affects the evaporator air temperature sensor can lead to the P1438 code.
Severity
Low - monitor the vehicle and repair when practical.
Can I drive?
The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P1438 Description

The P1438 diagnostic trouble code (DTC) refers to the A/C Evaporator Air Temperature Circuit Range/Performance. This code indicates that there is a problem with the A/C system related to the evaporator air temperature sensor. The evaporator air temperature sensor is responsible for monitoring the temperature of the air inside the A/C system. If the sensor detects that the temperature is outside of the expected range or if it is not performing as it should, the P1438 code will be triggered.

OBDII Code P1438 - A/C Evaporator Air Temperature Circuit Range/Performance
P1438 Code - A/C Evaporator Air Temperature Circuit Range/Performance

Common Causes of P1438

  1. Faulty evaporator air temperature sensor: The sensor may be malfunctioning or providing incorrect readings, triggering the P1438 code.
  2. Wiring or connector issues: Loose connections or damaged wiring related to the evaporator air temperature sensor can cause communication problems and trigger the code.
  3. Refrigerant leak: A leak in the A/C system that affects the evaporator air temperature sensor can lead to the P1438 code.
  4. A/C control module malfunction: If the control module that manages the A/C system's operation is faulty, it can cause issues with the evaporator air temperature sensor and trigger the code.

Symptoms of P1438

  1. Inconsistent cooling: The A/C system may blow air at varying temperatures, making it difficult to maintain a comfortable interior temperature.
  2. Reduced cooling efficiency: The A/C system may not cool the air as effectively as it should, leading to warmer interior temperatures.
  3. A/C system not working: In severe cases, the A/C system may fail to operate altogether, leaving the vehicle without any cooling capabilities.
  4. Unusual A/C system behavior: The A/C system may exhibit erratic behavior, such as turning on and off unexpectedly or not responding to controls properly.

How to Fix P1438

  1. Diagnose the issue: Use a scan tool to read the DTC and perform further diagnostics to identify the specific cause of the problem.
  2. Inspect the evaporator air temperature sensor: Check the sensor for any signs of damage or malfunction and replace it if necessary.
  3. Check wiring and connectors: Inspect the wiring and connectors related to the evaporator air temperature sensor for any issues and repair or replace them as needed.
  4. Address refrigerant leaks: If a refrigerant leak is detected, repair the leak and recharge the A/C system with the correct amount of refrigerant.
  5. Test the A/C system: After making the necessary repairs, test the A/C system to ensure that it is functioning properly and that the P1438 code does not reappear.

Cost to Fix P1438

The cost of repairing the A/C Evaporator Air Temperature Circuit Range/Performance issue can vary depending on the specific cause of the problem and the labor rates in your area. In general, the cost of parts for this repair can range from $50 to $200, with labor costs adding an additional $100 to $300. Overall, you can expect to pay anywhere from $150 to $500 for this repair, but prices may be higher or lower based on your location, vehicle make and model, and the extent of the repairs needed. It's recommended to consult with a qualified mechanic or auto repair shop to get an accurate estimate for your particular situation.

Need more information about the P1438 code?

Need more information on how to fix the P1438 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1438 code diagnosed by a professional: Find a repair shop in your area

Code P1438 Information for Specific Makes

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1438 Code

No Frequently Asked Questions about P1438 Code found.

Discuss the causes and fixes for P1438 OBDII Code

Submit a New Comment

Code P1438 comments

No comments found for this page.