AutoCodes – Chevrolet – U186A Chevrolet

U186A Chevrolet Code - Electronic Brake 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: U186A Chevrolet indicates Electronic Brake 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,135

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code U186A 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 U186A Chevrolet - Electronic Brake Control Module Lost Communication With Engine Control Module - AutoCodes.com — U186A Chevrolet Code - Electronic Brake Control Module Lost Communication With Engine Control Module

What does this mean?

What are the Possible Causes of the DTC U186A 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 U186A 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 U186A 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.

Need more information about the U186A Chevrolet code?

Need more information on how to fix the U186A Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U186A Chevrolet code diagnosed by a professional: Find a repair shop in your area

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 U186A Chevrolet Code

1. What are the common symptoms of OBDII code U186A in a Chevrolet related to Electronic Brake Control Module (EBCM) communication loss with Engine Control Module (ECM)?

- Common symptoms include illuminated warning lights such as ABS, traction control, or check engine light, loss of communication with the EBCM, and potential performance issues with the vehicle's braking system.

2. What are the possible causes of U186A code in a Chevrolet indicating a communication issue between the EBCM and ECM?

- Possible causes may include faulty wiring or connectors between the EBCM and ECM, a malfunctioning EBCM or ECM, software issues, or a communication network failure within the vehicle.

3. How can I diagnose the U186A code in a Chevrolet to pinpoint the communication problem between the EBCM and ECM?

- Diagnosing the U186A code may involve using a professional OBDII scanner to retrieve the specific fault codes, checking the wiring and connectors for any damage or corrosion, and performing a thorough inspection of the EBCM and ECM components.

4. Is it safe to continue driving my Chevrolet with the U186A code indicating a communication loss between the EBCM and ECM?

- It is not recommended to drive the vehicle with unresolved communication issues between the EBCM and ECM, as it may affect the proper functioning of the braking system and other critical safety features.

5. What are some repair tips for fixing the U186A code in a Chevrolet related to the EBCM losing communication with the ECM?

- Repair tips may include checking and repairing any damaged wiring or connectors, ensuring proper connection of the EBCM and ECM components, updating software if necessary, and performing a reset or relearn procedure as recommended by the manufacturer.

6. Can a DIY enthusiast fix the U186A code in a Chevrolet on their own, or is professional assistance required?

- Depending on the underlying cause of the communication issue, some DIY enthusiasts with the necessary tools and expertise may be able to address the U186A code, but in complex cases or if unsure, seeking professional assistance is recommended.

7. Are there any recalls or technical service bulletins related to the U186A code in Chevrolet vehicles with EBCM and ECM communication problems?

- It's advisable to check with Chevrolet dealership or online resources for any relevant recalls or technical service bulletins related to the U186A code and communication issues between the EBCM and ECM.

8. How much can I expect to pay for repairing the U186A code in a Chevrolet caused by the EBCM losing communication with the ECM?

- Repair costs for the U186A code can vary depending on the specific cause and required repairs, but it's recommended to consult with a trusted mechanic or dealership for an accurate estimate based on diagnostics.

9. Will resetting the DTCs (Diagnostic Trouble Codes) clear the U186A code in a Chevrolet, or is a more in-depth repair necessary?

- Resetting DTCs may temporarily clear the U186A code, but if the underlying communication issue between the EBCM and ECM persists, the code is likely to reappear, indicating the need for further diagnosis and repair.

10. How can I prevent the recurrence of the U186A code in my Chevrolet after repairing the communication problem between the EBCM and ECM?

- To prevent the U186A code from reoccurring, it's essential to ensure all wiring and connectors are secure and in good condition, perform regular maintenance checks on the EBCM and ECM, and address any software updates recommended by the manufacturer.