AutoCodes – Buick – U1860 Buick

U1860 Buick 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 Buick 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 455

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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

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 Buick?

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 Buick 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 U1860 Buick Code

What does the OBDII code U1860 mean for a Buick?

The U1860 code indicates that there is a communication failure between the Electric A/C Compressor Control Module and the Hybrid/EV Powertrain Control Module 2.

What are some common symptoms associated with the U1860 code?

Common symptoms include the air conditioning not functioning properly, a warning light on the dashboard, and reduced performance from the hybrid or electric system.

What could cause the U1860 code to trigger?

Possible causes include wiring issues, connector problems, a faulty Electric A/C Compressor Control Module, or a malfunctioning Hybrid/EV Powertrain Control Module 2.

How can I diagnose the U1860 code?

To diagnose the U1860 code, use an OBDII scanner to confirm the code, inspect the related wiring and connectors for damage, and check for other related codes that may provide further insights.

What repairs might be necessary to fix the U1860 code?

Repairs may involve fixing or replacing damaged wiring and connectors, replacing the Electric A/C Compressor Control Module, or addressing issues with the Hybrid/EV Powertrain Control Module 2.

Is it safe to drive a vehicle with the U1860 code?

While it might be safe to drive, the air conditioning may not work, and there could be underlying issues affecting the hybrid system, so it's advisable to have it checked as soon as possible.

Can I clear the U1860 code myself?

Yes, you can clear the code using an OBDII scanner, but if the underlying issue isn't resolved, the code is likely to return.

How much does it typically cost to repair the U1860 code?

Repair costs can vary widely depending on the specific issue but may range from $100 to $1,000 or more, especially if module replacements are needed.

Are there any preventive measures to avoid the U1860 code?

Regular vehicle maintenance, including electrical system checks and ensuring connectors are clean and secure, can help prevent issues that may lead to the U1860 code.