AutoCodes – Generic – U1860

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

Quick Answer

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Hybrid/EV Powertrain Control Module 2, Hybrid/EV Powertrain Control Module 2 harness is open or shorted, Hybrid/EV Powertrain Control Module 2 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: U1860 indicates Electric A/C Compressor Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2.
Common causes: Common causes include Faulty Hybrid/EV Powertrain Control Module 2, Hybrid/EV Powertrain Control Module 2 harness is open or shorted, Hybrid/EV Powertrain Control Module 2 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 1,111

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 Jun 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1860 Description

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the devices. The devices have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver device as an availability indication of the transmitter device. Each message contains the identification number of the transmitter device. The Diagnostic Trouble Code (DTC) will set when the A/C Compressor is not able to receive the serial data message from the Hybrid/EV Powertrain Control Module 2 for 3 seconds.

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

What does this mean?

What are the Possible Causes of the DTC U1860?

Faulty Hybrid/EV Powertrain Control Module 2
Hybrid/EV Powertrain Control Module 2 harness is open or shorted
Hybrid/EV Powertrain Control Module 2 circuit poor electrical connection

How to Fix the DTC U1860?

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 U1860 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.

Need more information about the U1860 code?

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Need Help with the Code?

Get the U1860 code diagnosed by a professional: Find a repair shop in your area

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.