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P1538 Chevrolet Code - A/C Request Circuit High Voltage

Quick Answer

The P1538 code in Chevrolet vehicles indicates a problem with the A/C Request Circuit High Voltage. Common causes include Faulty wiring in the A/C request circuit, Malfunctioning A/C request switch, Defective PCM. 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
P1538 Chevrolet indicates A/C Request Circuit High Voltage.
Common causes
Common causes include Faulty wiring in the A/C request circuit, Malfunctioning A/C request switch, Defective PCM.
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
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Code P1538 Chevrolet Description

The P1538 code in Chevrolet vehicles indicates a problem with the A/C Request Circuit High Voltage. This means that the powertrain control module (PCM) has detected that the voltage in the A/C request circuit is higher than the specified range. The A/C request circuit is responsible for communicating with the PCM to activate the air conditioning system when needed.

OBDII Code P1538 Chevrolet - A/C Request Circuit High Voltage
P1538 Chevrolet Code - A/C Request Circuit High Voltage

Common Causes of P1538 Chevrolet

  1. Faulty wiring in the A/C request circuit
  2. Malfunctioning A/C request switch
  3. Defective PCM
  4. Problem with the A/C compressor clutch

Symptoms of P1538 Chevrolet

  1. Inadequate cooling from the A/C system
  2. A/C system not activating when requested
  3. A/C system turning on and off intermittently
  4. Check Engine Light illuminated on the dashboard

How to Fix P1538 Chevrolet

  1. Begin by conducting a thorough inspection of the A/C request circuit wiring to check for any signs of damage or corrosion. Repair or replace any faulty wiring as needed.
  2. Test the A/C request switch to determine if it is functioning correctly. Replace the switch if it is found to be faulty.
  3. Check the PCM for any signs of damage or malfunction. If necessary, reprogram or replace the PCM to resolve the issue.
  4. Inspect the A/C compressor clutch for any issues, such as wear or damage. Replace the clutch if it is found to be faulty.

Cost to Fix P1538 Chevrolet

The cost of repairing a P1538 code in a Chevrolet vehicle can vary depending on the specific cause of the issue and the labor rates in your area. On average, you can expect to pay between $200 and $500 for parts and labor. Keep in mind that additional diagnostic time may be required to accurately diagnose the problem, which can affect the final cost. It's recommended to consult with a qualified mechanic or auto repair shop to get a more accurate estimate based on your vehicle's make and model.

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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.

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