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Engine-Codes – GMC – P1537 GMC

P1537 GMC Code - A/C Request Circuit Low Voltage

Quick Answer

The P1537 code for GMC vehicles refers to an issue with the A/C Request Circuit having low voltage. Common causes include Faulty A/C compressor clutch, Malfunctioning A/C pressure switch, Damaged wiring or connectors in the A/C circuit. 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
P1537 GMC indicates A/C Request Circuit Low Voltage.
Common causes
Common causes include Faulty A/C compressor clutch, Malfunctioning A/C pressure switch, Damaged wiring or connectors in the A/C circuit.
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 10, 2024
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Code P1537 GMC Description

The P1537 code for GMC vehicles refers to an issue with the A/C Request Circuit having low voltage. This means that the control module is not receiving the proper voltage signal from the A/C system, which can affect the performance of the vehicle's air conditioning.

OBDII Code P1537 GMC - A/C Request Circuit Low Voltage
P1537 GMC Code - A/C Request Circuit Low Voltage

Common Causes of P1537 GMC

  1. Faulty A/C compressor clutch
  2. Malfunctioning A/C pressure switch
  3. Damaged wiring or connectors in the A/C circuit
  4. Issues with the control module
  5. Low refrigerant levels in the A/C system

Symptoms of P1537 GMC

  1. Lack of cool air coming from the A/C vents
  2. A/C system not turning on or intermittently turning off
  3. Inconsistent cooling performance
  4. Unusual noises coming from the A/C system
  5. Check Engine Light illuminated on the dashboard

How to Fix P1537 GMC

  1. Begin by conducting a thorough inspection of the A/C system, including checking the compressor clutch, pressure switch, wiring, and connectors for any signs of damage or wear.
  2. Test the voltage output of the A/C system to determine if it is within the proper range specified by the manufacturer.
  3. Replace any faulty components such as the compressor clutch, pressure switch, or wiring that may be causing the low voltage issue.
  4. Clear the diagnostic trouble codes from the vehicle's system and reset the A/C control module to ensure proper functioning.
  5. Test the A/C system to verify that the issue has been resolved and that the A/C Request Circuit is now operating at the correct voltage levels.

Cost to Fix P1537 GMC

The cost of repairing a P1537 code for GMC vehicles can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the typical repair costs for this issue can range from $150 to $500, including parts and labor. However, it's important to note that the actual costs may be higher or lower based on factors such as the location of the repair shop, the make and model of the vehicle, and the type of engine. It's recommended to obtain quotes from multiple auto repair shops to get a more accurate estimate for the repair.

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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.

Frequently Asked Questions about P1537 GMC Code

1. What does the OBDII code P1537 mean on a GMC vehicle?

P1537 indicates that the A/C request circuit is experiencing low voltage, which may affect the proper operation of the air conditioning system.

2. What are common symptoms of the P1537 code in GMC vehicles?

Symptoms may include the A/C not blowing cold air, the A/C system failing to engage, or reduced performance of the climate control system.

3. What causes the P1537 code to appear on a GMC vehicle?

Common causes include a faulty A/C request switch, damaged or corroded wiring, a bad relay, or a malfunctioning control module.

4. How can I diagnose the P1537 code on a GMC?

Start by checking the A/C request switch and related wiring for damage or loose connections. Use a multimeter to verify voltage and continuity in the circuit.

5. Can a faulty A/C compressor cause the P1537 code?

While the A/C compressor itself doesn't directly cause this code, issues with the A/C request signal to the compressor can trigger the code.

6. How do I fix the P1537 code on a GMC vehicle?

Repairs may involve replacing the A/C request switch, repairing damaged wiring or connectors, or addressing control module issues if necessary.

7. Is it safe to drive with the P1537 code active?

Yes, it is generally safe to drive, but your A/C system may not function properly until the issue is resolved.

8. Does the P1537 code affect engine performance on a GMC vehicle?

Typically, this code does not directly impact engine performance, but it can affect the comfort of the cabin by disabling the A/C.

9. Can clearing the P1537 code fix the problem?

Clearing the code may temporarily remove it from the system, but if the underlying issue is not resolved, the code will likely return.

10. How much does it cost to repair the P1537 code on a GMC?

Repair costs can vary depending on the specific cause, ranging from $50 for minor wiring repairs to $200 or more for replacing the A/C request switch or related components.

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