AutoCodes – GMC – C0161 2016 GMC Sierra

C0161 2016 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 2016 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.

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Code Popularity 230

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
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Code C0161 2016 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 2016 GMC Sierra - Antilock Braking System Brake Switch Circuit - AutoCodes.com — C0161 2016 GMC Sierra Code - Antilock Braking System Brake Switch Circuit

What does this mean?

What are the Possible Causes of the DTC C0161 2016 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 2016 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 2016 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 2016 GMC Sierra 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 C0161 2016 GMC Sierra Code

1. What does OBDII code C0161 mean on a 2016 GMC Sierra?

Code C0161 indicates an issue with the Antilock Braking System (ABS) Brake Switch Circuit, meaning the ABS module is not receiving the correct signal from the brake switch.

2. What are the common symptoms of code C0161 in a 2016 GMC Sierra?

Common symptoms include the ABS warning light or traction control light turning on, loss of ABS or traction control functionality, and potentially the brake lights not working.

3. What causes code C0161 to appear on a 2016 GMC Sierra?

This code can be caused by a faulty brake switch, damaged or corroded wiring, a blown fuse, or a malfunctioning ABS module.

4. Can a faulty brake light switch trigger code C0161?

Yes, a faulty brake light switch is one of the most common reasons for this code, as it disrupts communication with the ABS module.

5. How do I diagnose code C0161 in my 2016 GMC Sierra?

Start by checking the brake light switch for proper operation, inspect the wiring and connectors for damage or corrosion, and verify power and ground at the brake switch.

6. Can I still drive my GMC Sierra with code C0161?

While the vehicle may still drive, the ABS and traction control systems may not function properly, which can affect safety in braking or slippery conditions.

7. How do I fix code C0161 on a 2016 GMC Sierra?

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

8. How much does it cost to repair code C0161 on a 2016 GMC Sierra?

Repair costs vary but typically range from $50 to $150 for a brake light switch replacement and up to $500 or more if ABS module repairs are needed.

9. Can a blown fuse cause code C0161?

Yes, a blown fuse in the brake light or ABS circuit can interrupt the signal and trigger this code.

10. Do I need a professional mechanic to fix code C0161?

While some repairs like replacing a brake light switch can be done by DIYers, diagnosing and repairing advanced electrical or ABS module issues may require a professional mechanic.