AutoCodes – GMC – P15C6 GMC

P15C6 GMC Code - Electric A/C Compressor Speed Request Signal Message Counter Incorrect

Quick Answer

The hybrid powertrain control module 2 receives serial data messages from the A/C compressor. Common causes include Faulty Electric A/C Compressor, Electric A/C Compressor harness is open or shorted, Electric A/C Compressor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P15C6 GMC indicates Electric A/C Compressor Speed Request Signal Message Counter Incorrect.
Common causes: Common causes include Faulty Electric A/C Compressor, Electric A/C Compressor harness is open or shorted, Electric A/C Compressor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 1,165

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jan 03, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P15C6 GMC Description

The hybrid powertrain control module 2 receives serial data messages from the A/C compressor. If the message counter from the A/C compressor is not incrementing based on the currently commanded state, the hybrid powertrain control module 2 sets the DTC.

OBDII Code P15C6 GMC - Electric A/C Compressor Speed Request Signal Message Counter Incorrect - AutoCodes.com — P15C6 GMC Code - Electric A/C Compressor Speed Request Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P15C6 GMC?

Faulty Electric A/C Compressor
Electric A/C Compressor harness is open or shorted
Electric A/C Compressor circuit poor electrical connection

How to Fix the DTC P15C6 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 P15C6 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 P15C6 GMC Code

1. What are the common symptoms of OBDII code P15C6 in a GMC related to the Electric A/C Compressor Speed Request Signal Message Counter Incorrect?

- Common symptoms include the air conditioning system not functioning properly, the compressor not engaging, and a malfunction indicator light (MIL) illuminated on the dashboard.

2. What are some possible causes of OBDII code P15C6 in a GMC?

- Possible causes of this code include a faulty electric A/C compressor, wiring issues, communication errors between modules, or a software glitch in the vehicle's control module.

3. How can I diagnose the Electric A/C Compressor Speed Request Signal Message Counter Incorrect code in my GMC?

- Diagnosis typically involves using a professional OBDII scanner to read and interpret the code, checking the wiring and connections related to the A/C compressor, and performing system tests to pinpoint the issue.

4. Can I continue driving my GMC with OBDII code P15C6 present?

- It is not recommended to continue driving with this code active, as it can lead to further damage to the A/C system and potentially affect other vehicle systems. It is best to address the issue promptly.

5. What are some repair tips for resolving OBDII code P15C6 in a GMC?

- Repair tips may include checking and repairing any damaged wiring, ensuring proper connections, resetting the control module, and replacing the electric A/C compressor if necessary.

6. Is it possible to reset OBDII code P15C6 in a GMC without fixing the underlying issue?

- While you can clear the code temporarily, it is important to address the root cause of the problem to prevent the code from reoccurring and ensure the proper functioning of the A/C system.

7. How much does it typically cost to repair OBDII code P15C6 in a GMC?

- The cost of repairing this code can vary depending on the specific issue causing it. Costs may include parts and labor for repairs or replacements, with an average range of a few hundred to a thousand dollars.

8. Can a DIY enthusiast fix OBDII code P15C6 in a GMC?

- DIY enthusiasts with knowledge of automotive systems and access to the necessary tools may be able to diagnose and repair this code themselves. However, complex electrical issues may require professional assistance.

9. Are there any recalls or technical service bulletins related to OBDII code P15C6 in GMC vehicles?

- It is recommended to check with a GMC dealership or visit the manufacturer's website to see if there are any recalls or technical service bulletins related to this specific OBDII code in your vehicle.

10. How can I prevent OBDII code P15C6 from occurring in my GMC in the future?

- Regular maintenance of the A/C system, checking for any signs of wear or damage, and addressing any electrical issues promptly can help prevent the occurrence of this code in the future.