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Engine-Codes – GMC – U1860 GMC

U1860 GMC Code - Electric A/C Compressor Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2

Quick Answer

The U1860 GMC code indicates that the Electric A/C Compressor Control Module has lost communication with the Hybrid/EV Powertrain Control Module 2. Common causes include Faulty Electric A/C Compressor Control Module, Wiring or connection issues between modules, Hybrid/EV Powertrain Control Module 2 malfunction. 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
U1860 GMC indicates Electric A/C Compressor Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2.
Common causes
Common causes include Faulty Electric A/C Compressor Control Module, Wiring or connection issues between modules, Hybrid/EV Powertrain Control Module 2 malfunction.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 16, 2024
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Code U1860 GMC Description

The U1860 GMC code indicates that the Electric A/C Compressor Control Module has lost communication with the Hybrid/EV Powertrain Control Module 2. In hybrid or electric vehicles, the A/C compressor is typically electrically driven to reduce the load on the engine and improve overall efficiency. The control module is responsible for managing the operation of the A/C compressor and communicating with other modules in the vehicle, such as the powertrain control module.

OBDII Code U1860 GMC - Electric A/C Compressor Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2
U1860 GMC Code - Electric A/C Compressor Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2

Common Causes of U1860 GMC

  1. Faulty Electric A/C Compressor Control Module
  2. Wiring or connection issues between modules
  3. Hybrid/EV Powertrain Control Module 2 malfunction
  4. Software or programming issues
  5. Electrical system malfunctions

Symptoms of U1860 GMC

  1. Lack of cooling in the cabin
  2. A/C compressor not engaging
  3. Check engine light illuminated
  4. Reduced fuel efficiency
  5. Overheating of other components

How to Fix U1860 GMC

  1. Begin by conducting a thorough inspection of the A/C compressor control module and related wiring to check for any visible damage or loose connections.
  2. Use a diagnostic scanner to retrieve and clear the U1860 code, then attempt to re-establish communication between the control modules.
  3. If communication cannot be restored, consider replacing the Electric A/C Compressor Control Module or addressing any underlying electrical system issues.
  4. Test the A/C system to ensure proper functionality and communication between modules.
  5. Clear the code from the vehicle's system and perform a final test drive to confirm that the issue has been resolved.

Cost to Fix U1860 GMC

The typical repair costs for addressing the U1860 GMC code can vary depending on the specific cause of the issue. In general, replacing the Electric A/C Compressor Control Module or addressing wiring/connectivity issues can range from $200 to $600, including parts and labor. However, additional costs may apply if further diagnostics or repairs are needed. It's recommended to consult with a qualified mechanic or dealership to obtain a more accurate estimate based on the vehicle's make and model, as well as the extent of the issue. Labor rates at auto repair shops typically range from $80 to $150 per hour, but can vary based on location and other factors.

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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 U1860 GMC Code

1. What are the common symptoms of OBDII code U1860 in a GMC related to the Electric A/C Compressor Control Module?

- Common symptoms include loss of communication with the hybrid/EV powertrain control module 2, issues with the electric A/C compressor, and potentially a malfunctioning air conditioning system.

2. What are the possible causes of OBDII code U1860 in a GMC?

- Possible causes include a faulty electric A/C compressor control module, damaged wiring or connectors, a malfunctioning hybrid/EV powertrain control module 2, or communication network issues.

3. How can I diagnose OBDII code U1860 in a GMC?

- Diagnosis typically involves using a professional OBDII scanner to retrieve the code, checking for any related trouble codes, inspecting the wiring and connectors for damage, and testing the communication between modules.

4. Can I still drive my GMC with OBDII code U1860 present?

- It is not recommended to drive your GMC with this code present, as it can lead to issues with the electric A/C compressor and affect the overall performance of the vehicle's air conditioning system.

5. How can I repair OBDII code U1860 in a GMC?

- Repair options include addressing any wiring or connector issues, replacing the electric A/C compressor control module if faulty, ensuring proper communication between modules, and clearing the trouble code with a diagnostic tool.

6. Is it safe to reset the trouble code U1860 in a GMC without fixing the underlying issue?

- Resetting the trouble code without addressing the underlying issue may temporarily clear the warning light, but the problem will likely reoccur. It is important to diagnose and repair the root cause to prevent further issues.

7. Can a DIY enthusiast fix OBDII code U1860 in a GMC?

- While some aspects of diagnosing and repairing this code may be possible for DIY enthusiasts, it is recommended to consult a professional mechanic with experience in handling complex automotive electrical systems for a thorough diagnosis and repair.

8. How much does it typically cost to repair OBDII code U1860 in a GMC?

- The cost of repairing this code can vary depending on the specific issue, parts needed for replacement, and labor costs. It is advisable to obtain quotes from reputable mechanics or dealerships for an accurate estimate.

9. Will OBDII code U1860 cause my GMC to fail an emissions test?

- The presence of this code may indicate issues with the vehicle's emissions control system, potentially leading to a failed emissions test. It is essential to address and repair the underlying problem to ensure your vehicle meets emission standards.

10. How long can I safely drive my GMC with OBDII code U1860 before getting it repaired?

- It is recommended to address the issue promptly to prevent further damage to the electric A/C compressor and potential issues with the vehicle's air conditioning system. Driving with this code present for an extended period is not advisable.

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