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Engine-Codes – Generic – U1860

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

Quick Answer

The U1860 code indicates that there is a communication error between the Electric A/C Compressor Control Module and the Hybrid/EV Powertrain Control Module 2 in a hybrid or electric vehicle. Common causes include Faulty wiring or connectors, Software issues in the control modules, Component failure in either module. 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 indicates Electric A/C Compressor Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2.
Common causes
Common causes include Faulty wiring or connectors, Software issues in the control modules, Component failure in either module.
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 11, 2024
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Code U1860 Description

The U1860 code indicates that there is a communication error between the Electric A/C Compressor Control Module and the Hybrid/EV Powertrain Control Module 2 in a hybrid or electric vehicle. The Electric A/C Compressor Control Module is responsible for controlling the operation of the electric air conditioning compressor, which is crucial for maintaining a comfortable cabin temperature. The Hybrid/EV Powertrain Control Module 2 manages the hybrid or electric powertrain system, ensuring optimal performance and efficiency. When these two modules fail to communicate properly, it can lead to issues with the air conditioning system and potentially affect the overall performance of the vehicle.

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

Common Causes of U1860

  1. Faulty wiring or connectors
  2. Software issues in the control modules
  3. Component failure in either module
  4. Water damage to the modules
  5. Electrical interference or communication signal disruption

Symptoms of U1860

  1. Inoperative air conditioning system
  2. Irregular cooling in the cabin
  3. Check Engine Light illuminated
  4. Reduced fuel efficiency
  5. Poor overall performance of the vehicle

How to Fix U1860

  1. Begin by diagnosing the specific cause of the communication error using a diagnostic scanner to retrieve the trouble codes and pinpoint the issue.
  2. Inspect the wiring and connectors between the Electric A/C Compressor Control Module and the Hybrid/EV Powertrain Control Module 2 for any damage or loose connections.
  3. Check the control modules themselves for any signs of damage or malfunctions, and replace them if necessary.
  4. Clear the trouble codes after making the necessary repairs and perform a test drive to ensure that the communication error has been resolved.
  5. If the issue persists, consult with a professional technician for further troubleshooting and potential component replacement.

Cost to Fix U1860

The typical repair costs for addressing the U1860 code can vary depending on the specific cause of the communication error. On average, the parts and labor for this repair could range from $200 to $500. However, it's important to note that prices can fluctuate based on the location of the repair shop, the vehicle's make and model, and the complexity of the repair. Diagnostic time and labor rates at auto repair shops can typically range between $80 and $150 per hour, with rates potentially higher at dealerships or in metropolitan areas. To obtain a more accurate estimate, it's recommended to consult with local auto repair shops.

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Code U1860 Information for Specific Makes

  • U1860 Buick — Electric A/C Compressor Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2
  • U1860 Cadillac — Electric A/C Compressor Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2
  • U1860 Chevrolet — Electric A/C Compressor Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2
  • U1860 GMC — Electric A/C Compressor Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2
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 Code

1. What are the common symptoms of OBDII code U1860?

- Common symptoms include loss of communication between the Electric A/C Compressor Control Module and the Hybrid/EV Powertrain Control Module 2, resulting in the A/C system not functioning properly.

2. What are the possible causes of code U1860?

- The code U1860 can be caused by issues such as wiring problems, faulty control modules, poor connections, or software glitches.

3. How can I diagnose OBDII code U1860?

- Diagnosis involves using a professional OBDII scanner to retrieve the code, checking the wiring connections between the control modules, and testing the modules for proper communication.

4. How is OBDII code U1860 typically repaired?

- Repairs for code U1860 may involve repairing or replacing damaged wiring, ensuring proper connections, updating software, or replacing faulty control modules as needed.

5. Can code U1860 cause the A/C system to stop working completely?

- Yes, if the Electric A/C Compressor Control Module loses communication with the Hybrid/EV Powertrain Control Module 2, it can cause the A/C system to stop working altogether.

6. Is it safe to continue driving with OBDII code U1860 present?

- It is generally not recommended to continue driving with unresolved OBDII codes, as they can indicate underlying issues that may affect the vehicle's performance and safety.

7. How do I prevent OBDII code U1860 from occurring in the future?

- Regular maintenance, checking wiring connections, and addressing any communication issues between control modules can help prevent code U1860 from occurring.

8. Can a DIY enthusiast repair OBDII code U1860 at home?

- While some basic checks and repairs can be done at home, diagnosing and repairing code U1860 may require specialized tools and expertise, making it advisable to seek professional help.

9. Can code U1860 affect the fuel efficiency of a hybrid or electric vehicle?

- Yes, if the Electric A/C Compressor Control Module cannot communicate with the Powertrain Control Module, it can impact the overall efficiency of the vehicle's powertrain systems.

10. How long does it typically take to diagnose and repair OBDII code U1860?

- The time to diagnose and repair code U1860 can vary depending on the underlying cause and the complexity of the repair. It may range from a few hours to a full day in some cases.

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