AutoCodes – GMC – C0161 2018 GMC Sierra

C0161 2018 GMC Sierra Code - Antilock Braking System Brake Switch Circuit

Quick Answer

When the brake pedal is applied, the Body Control Module (BCM) sends a serial data message to the Electronic Brake Control Module (EBCM) in reference to the brake pedal positions. Common causes include Faulty Brake Switch (Stop Lamp Switch), Brake Switch harness is open or shorted, Brake Switch 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: C0161 2018 GMC Sierra indicates Antilock Braking System Brake Switch Circuit.
Common causes: Common causes include Faulty Brake Switch (Stop Lamp Switch), Brake Switch harness is open or shorted, Brake Switch 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 438

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 20, 2023

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 C0161 2018 GMC Sierra Description

When the brake pedal is applied, the Body Control Module (BCM) sends a serial data message to the Electronic Brake Control Module (EBCM) in reference to the brake pedal positions. The Electronic Brake Control Module compares the correlation between the brake pedal position and the amount of brake pressure it senses from the brake pressure sensor, which is internal to the brake pressure modulator. It uses this information to control the vehicle during an electronic stability control event. The Diagnostic Trouble Code (DTC) will be set when the Electronic Brake Control Module detects the vehicle speed is greater than 16 km/h (10 MPH), the brake pedal is applied for 122 s, and the brake pressure is less than 620 kPa (90 psi).

OBDII Code C0161 2018 GMC Sierra - Antilock Braking System Brake Switch Circuit - AutoCodes.com — C0161 2018 GMC Sierra Code - Antilock Braking System Brake Switch Circuit

What does this mean?

What are the Possible Causes of the DTC C0161 2018 GMC Sierra?

Faulty Brake Switch (Stop Lamp Switch)
Brake Switch harness is open or shorted
Brake Switch circuit poor electrical connection
Faulty Electronic Brake Control Module (EBCM) with Brake Pressure Modulator Valve (BPMV)

How to Fix the DTC C0161 2018 GMC Sierra?

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 C0161 2018 GMC Sierra 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 C0161 2018 GMC Sierra code?

Need more information on how to fix the C0161 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C0161 2018 GMC Sierra 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 C0161 2018 GMC Sierra Code

What does the OBDII code C0161 mean for my 2018 GMC Sierra?

C0161 indicates a problem with the Antilock Braking System (ABS) related to the brake switch circuit, which can affect the performance of the ABS.

What are common symptoms of the C0161 code?

Common symptoms include the ABS warning light illuminating on the dashboard, potential issues with the ABS functioning, and the brake pedal feeling different when pressed.

What could cause the C0161 code to trigger?

Causes may include a faulty brake switch, damaged wiring or connectors in the brake switch circuit, or a malfunctioning ABS module.

Can I drive my 2018 GMC Sierra with the C0161 code?

While it may be possible to drive the vehicle, it's not recommended as it can compromise braking performance and safety features. It's best to address the issue promptly.

How can I diagnose the C0161 code accurately?

To diagnose C0161, use an OBDII scanner to check for other related codes, inspect the brake switch and wiring for damage, and test the brake switch operation.

What are some repair tips for fixing the C0161 code?

Repairs may involve replacing the brake switch, repairing damaged wiring, or reprogramming or replacing the ABS module if necessary.

Is the C0161 code a serious issue?

Yes, it is considered serious because it affects the ABS, which is crucial for safe braking performance under various driving conditions.

Will clearing the code fix the problem?

Clearing the code may turn off the warning light temporarily, but it won't fix the underlying issue that caused the code. Proper diagnosis and repair are essential.

How much does it typically cost to fix the C0161 code?

Repair costs can vary widely based on the specific issue, but it may range from $100 to $500, depending on whether you need to replace the brake switch, repair wiring, or address ABS module issues.