AutoCodes – GMC – P1537 GMC

P1537 GMC Code - A/C Request Circuit Low Voltage

Quick Answer

The Powertrain Control Module (PCM) activates the A/C clutch relay when the PCM detects an A/C request. Common causes include Faulty A/C Clutch Relay, A/C Clutch Relay harness is open or shorted, A/C Clutch Relay circuit poor electrical connection. 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 Clutch Relay, A/C Clutch Relay harness is open or shorted, A/C Clutch Relay circuit poor electrical connection.
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.

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Code Popularity 3,376

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 29, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1537 GMC Description

The Powertrain Control Module (PCM) activates the A/C clutch relay when the PCM detects an A/C request. Voltage is present at both the A/C compressor clutch and the A/C clutch status terminal at the PCM when the relay is activated.

OBDII Code P1537 GMC - A/C Request Circuit Low Voltage - AutoCodes.com — P1537 GMC Code - A/C Request Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1537 GMC?

Faulty A/C Clutch Relay
A/C Clutch Relay harness is open or shorted
A/C Clutch Relay circuit poor electrical connection

How to Fix the DTC P1537 GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1537 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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.