AutoCodes – Chevrolet – U0115 Chevrolet

U0115 Chevrolet Code - Lost Communication with Engine Control Module 'B'

Quick Answer

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Engine Control Module 'B', Engine Control Module 'B' harness is open or shorted, Engine Control Module 'B' 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: U0115 Chevrolet indicates Lost Communication with Engine Control Module 'B'.
Common causes: Common causes include Faulty Engine Control Module 'B', Engine Control Module 'B' harness is open or shorted, Engine Control Module 'B' 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 866

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 Mar 30, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0115 Chevrolet Description

Modules connected to the high speed General Motor Local Area Network (GMLAN) 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, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Engine Control Module 'B' has not been received.

OBDII Code U0115 Chevrolet - Lost Communication with Engine Control Module 'B' - AutoCodes.com — U0115 Chevrolet Code - Lost Communication with Engine Control Module 'B'

What does this mean?

What are the Possible Causes of the DTC U0115 Chevrolet?

Faulty Engine Control Module 'B'
Engine Control Module 'B' harness is open or shorted
Engine Control Module 'B' circuit poor electrical connection

How to Fix the DTC U0115 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 U0115 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 U0115 Chevrolet Code

What does OBDII code U0115 mean for a Chevrolet vehicle?

U0115 indicates a lost communication with Engine Control Module 'B', suggesting that the engine control module is not receiving or sending data to other control modules.

What are common symptoms of the U0115 code?

Symptoms may include engine performance issues, warning lights on the dashboard, a lack of communication with certain systems, and potential stalling or starting problems.

What could cause the U0115 code to trigger?

Possible causes include a faulty Engine Control Module 'B', damaged wiring or connectors, a blown fuse, or communication issues between modules due to software problems.

How can I diagnose the issue related to the U0115 code?

Start by using an OBDII scanner to confirm the code. Check the wiring and connectors for damage, inspect fuses, and ensure all modules are properly connected. Testing the functionality of Engine Control Module 'B' may also be necessary.

What repair steps can I take for the U0115 code?

Repairs may involve replacing damaged wiring or connectors, reprogramming or replacing Engine Control Module 'B', or addressing any underlying issues with the vehicle's electrical system.

Is the U0115 code serious?

Yes, it can be serious as it may affect the vehicle's performance and drivability. It's advisable to address it promptly to avoid further issues.

Can I drive my Chevrolet with the U0115 code?

While it may be possible to drive, it is not recommended as the vehicle could experience performance issues, and there may be risks of stalling or failure to start.

Will clearing the U0115 code fix the problem?

Clearing the code may temporarily turn off the warning light, but if the underlying issue is not resolved, the code is likely to reappear.

What should I do if the U0115 code keeps coming back?

If the code persists, further diagnosis is needed to identify the root cause. Consider consulting a professional mechanic who can perform a thorough inspection and necessary repairs.