AutoCodes – GMC – C1101 GMC

C1101 GMC Code - Brake Booster Vacuum Sensor Performance

Quick Answer

The Electronic Brake Control Module (EBCM) provides a power 5-volt reference to the brake booster vacuum sensor. Common causes include Faulty Brake Booster Vacuum Sensor, Brake Booster Vacuum Sensor harness is open or shorted, Brake Booster Vacuum Sensor 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: C1101 GMC indicates Brake Booster Vacuum Sensor Performance.
Common causes: Common causes include Faulty Brake Booster Vacuum Sensor, Brake Booster Vacuum Sensor harness is open or shorted, Brake Booster Vacuum Sensor 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 1,294

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 Aug 13, 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 C1101 GMC Description

The Electronic Brake Control Module (EBCM) provides a power 5-volt reference to the brake booster vacuum sensor. The brake booster vacuum sensor converts the change in vacuum levels in the brake booster into a voltage signal. This signal is sent to the EBCM. The voltage signal ranges, from 0.13 to 3.30 volts depending on vacuum levels. The low reference is the return side of the sensor to ground.

OBDII Code C1101 GMC - Brake Booster Vacuum Sensor Performance - AutoCodes.com — C1101 GMC Code - Brake Booster Vacuum Sensor Performance

What does this mean?

What are the Possible Causes of the DTC C1101 GMC?

Faulty Brake Booster Vacuum Sensor
Brake Booster Vacuum Sensor harness is open or shorted
Brake Booster Vacuum Sensor circuit poor electrical connection

How to Fix the DTC C1101 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 C1101 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 C1101 GMC code?

Need more information on how to fix the C1101 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1101 GMC 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 C1101 GMC Code

1. What are common symptoms of OBDII code C1101 GMC (Brake Booster Vacuum Sensor Performance)?

- Common symptoms include a firm brake pedal feel, poor brake performance, illuminated brake warning light, and potential loss of power brake assist.

2. What are the possible causes of OBDII code C1101 GMC?

- The code C1101 GMC is typically triggered by issues with the brake booster vacuum sensor, such as a faulty sensor, damaged wiring, or vacuum system leaks.

3. How can I diagnose the source of OBDII code C1101 GMC?

- Diagnosis involves checking the brake booster vacuum sensor, inspecting the vacuum hoses and connections for leaks, and testing the sensor's electrical circuitry for proper function.

4. What are some tips for repairing OBDII code C1101 GMC?

- Repair tips include replacing the faulty brake booster vacuum sensor, repairing any damaged wiring, addressing vacuum leaks, and clearing the code with an OBDII scanner.

5. Can OBDII code C1101 GMC be safely ignored?

- Ignoring the code can lead to potential brake system malfunctions, so it is important to address the underlying issue promptly to ensure safe driving conditions.

6. How do I reset OBDII code C1101 GMC after making repairs?

- After making the necessary repairs, use an OBDII scanner to clear the code and reset the vehicle's computer system to turn off the warning light.

7. Is it safe to drive with OBDII code C1101 GMC active?

- Driving with the code active may result in reduced brake performance and safety risks, so it is recommended to address the issue before continuing to drive the vehicle.

8. Can a DIY enthusiast repair OBDII code C1101 GMC?

- Depending on the individual's mechanical skills and access to tools, DIY enthusiasts can potentially repair the code by following diagnostic procedures and replacing the faulty components.

9. How much does it typically cost to repair OBDII code C1101 GMC at a repair shop?

- Repair costs for OBDII code C1101 GMC can vary depending on the extent of the issue, but they typically range from $100 to $300 for parts and labor.

10. Are there any preventive maintenance measures to avoid OBDII code C1101 GMC in the future?

- Regularly inspecting the brake system, including the brake booster vacuum sensor and associated components, and addressing any signs of wear or damage can help prevent the recurrence of OBDII code C1101 GMC.