AutoCodes – GMC – U0418 GMC

U0418 GMC Code - Invalid Data Received From Brake System Control Module

Quick Answer

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Common causes include Faulty Brake System Control Module, Brake System Control Module harness is open or shorted, Brake System 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: U0418 GMC indicates Invalid Data Received From Brake System Control Module.
Common causes: Common causes include Faulty Brake System Control Module, Brake System Control Module harness is open or shorted, Brake System 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 1,981

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 Apr 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0418 GMC Description

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Operating information and commands are exchanged among the devices. The devices have programmed information about what messages are needed to be exchanged on the serial data circuits. Some devices are constantly receiving information from other devices through serial data communication network. The invalid data Diagnostic Trouble Code (DTC) will be set when a receiving device detects a discrepancy in the information it receives from the Brake System Control Module causing its integrity to be questioned.

OBDII Code U0418 GMC - Invalid Data Received From Brake System Control Module - AutoCodes.com — U0418 GMC Code - Invalid Data Received From Brake System Control Module

What does this mean?

What are the Possible Causes of the DTC U0418 GMC?

Faulty Brake System Control Module
Brake System Control Module harness is open or shorted
Brake System Control Module circuit poor electrical connection

How to Fix the DTC U0418 GMC?

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 U0418 GMC 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 U0418 GMC code?

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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 U0418 GMC Code

1. What does the OBDII code U0418 mean on a GMC vehicle?

U0418 indicates that the vehicle's control module has received invalid or corrupted data from the Brake System Control Module.

2. What are common symptoms of the U0418 code in a GMC?

Common symptoms include the ABS or traction control warning lights illuminating, inconsistent braking performance, or no noticeable symptoms at all.

3. What causes the U0418 code to appear?

The code is often triggered by a malfunctioning Brake System Control Module, communication issues in the CAN bus network, or damaged wiring and connectors.

4. Is it safe to drive with the U0418 code on a GMC?

While the vehicle may still be drivable, safety features like ABS or traction control may not function properly, increasing the risk of accidents in certain conditions.

5. How is the U0418 code diagnosed?

A technician will use a scan tool to confirm the code, inspect the Brake System Control Module, check CAN bus communication, and examine wiring and connectors for damage.

6. Can a low battery cause the U0418 code on a GMC?

Yes, a weak or failing battery can disrupt communication between modules and potentially trigger the U0418 code.

7. What repairs are typically needed to fix the U0418 code?

Repairs may include reprogramming or replacing the Brake System Control Module, repairing damaged wiring, or addressing CAN bus communication faults.

8. Will clearing the U0418 code fix the issue on my GMC?

Clearing the code may temporarily remove the warning, but it wonâ€™t resolve the underlying issue causing the invalid data.

9. How much does it cost to fix the U0418 code on a GMC?

Repair costs vary depending on the issue, ranging from $100 for minor wiring fixes to over $1,000 if the Brake System Control Module needs replacement.

10. Can the U0418 code be caused by aftermarket modifications?

Yes, improperly installed aftermarket devices that interfere with the vehicle's electrical system can disrupt module communication and trigger the code.