AutoCodes – Chevrolet – U1861 Chevrolet

U1861 Chevrolet Code - Battery Charger Control Module Lost Communication With Engine Control Module

Quick Answer

Modules connected to the Controller Area Network (CAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted, Engine Control Module 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: U1861 Chevrolet indicates Battery Charger Control Module Lost Communication With Engine Control Module.
Common causes: Common causes include Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted, Engine Control Module 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 1,073

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 U1861 Chevrolet Description

Modules connected to the Controller Area Network (CAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. Each message contains the identification number of the transmitter module. A module with a CAN serial data circuits malfunction or which loses power during the current ignition cycle will have a Loss of Communication Diagnostic Trouble Code (DTC) set by other modules that depend on information from that failed module. If any of the CAN circuit are shorted to battery voltage, ground, or between them no communication is possible on the CAN serial data bus, a Diagnostic Trouble Code will set.

OBDII Code U1861 Chevrolet - Battery Charger Control Module Lost Communication With Engine Control Module - AutoCodes.com — U1861 Chevrolet Code - Battery Charger Control Module Lost Communication With Engine Control Module

What does this mean?

What are the Possible Causes of the DTC U1861 Chevrolet?

Faulty Engine Control Module (ECM)
Engine Control Module harness is open or shorted
Engine Control Module circuit poor electrical connection

How to Fix the DTC U1861 Chevrolet?

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 U1861 Chevrolet 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 U1861 Chevrolet Code

1. What are the common symptoms of OBDII code U1861 in a Chevrolet related to the Battery Charger Control Module losing communication with the Engine Control Module?

- Common symptoms include issues with charging the vehicle's battery, potential start-up problems, and warning lights on the dashboard related to the charging system.

2. What are some possible causes of U1861 code in a Chevrolet?

- Possible causes include a faulty Battery Charger Control Module, a malfunctioning Engine Control Module, damaged wiring or connectors, or a drained or faulty battery.

3. How can I diagnose the U1861 code in my Chevrolet?

- Diagnosis typically involves using an OBDII scanner to read the code, checking the battery and charging system for any issues, and inspecting the wiring and connectors for damage or corrosion.

4. Can a DIY enthusiast repair the U1861 code in a Chevrolet?

- While basic troubleshooting like checking connections and fuses can be done by DIY enthusiasts, diagnosing and repairing complex issues related to the Battery Charger Control Module may require professional expertise.

5. What are some repair tips for resolving the U1861 code in a Chevrolet?

- Repair tips may include checking and cleaning battery terminals, ensuring proper battery voltage, inspecting wiring harnesses for damage, and resetting the fault codes after potential repairs.

6. Is it safe to continue driving with the U1861 code present in a Chevrolet?

- It is not recommended to continue driving with this code present, as it can lead to potential issues with the vehicle's charging system and may cause further damage if left unresolved.

7. How much does it typically cost to repair the U1861 code in a Chevrolet?

- Repair costs can vary depending on the exact cause of the issue, but it may involve expenses for parts replacement, labor charges, and diagnostic fees at a dealership or repair shop.

8. Can a weak or dead battery trigger the U1861 code in a Chevrolet?

- Yes, a weak or dead battery can potentially trigger this code if it is unable to provide sufficient power for the communication between the Battery Charger Control Module and the Engine Control Module.

9. Are there any recalls or technical service bulletins related to the U1861 code in Chevrolet vehicles?

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

10. How important is it to address the U1861 code promptly in a Chevrolet?

- It is crucial to address the U1861 code promptly to prevent potential issues with the vehicle's charging system, ensure proper communication between modules, and maintain overall vehicle performance and safety.