AutoCodes – Hummer – C1101 Hummer

C1101 Hummer 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 Hummer 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.

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Code Popularity 1,029

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

What does this mean?

What are the Possible Causes of the DTC C1101 Hummer?

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 Hummer?

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 Hummer 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 C1101 Hummer Code

1. What are the common symptoms of OBDII code C1101 Brake Booster Vacuum Sensor Performance on a Hummer?

- Common symptoms include a spongy brake pedal, reduced brake assist, illuminated brake warning light on the dashboard, and potential loss of power brakes.

2. What are the possible causes of OBDII code C1101 on a Hummer?

- The code C1101 may be triggered by a faulty brake booster vacuum sensor, a vacuum leak in the brake booster system, or a malfunctioning brake booster itself.

3. How can I diagnose the cause of OBDII code C1101 on my Hummer?

- To diagnose the issue, you can start by visually inspecting the brake booster system for any signs of damage or leaks. You may also use a scan tool to monitor sensor readings and vacuum levels.

4. Can I drive my Hummer with OBDII code C1101 Brake Booster Vacuum Sensor Performance?

- It is not recommended to drive your Hummer with this code active, as it can affect the performance of your brakes and compromise your safety. It is best to address the issue promptly.

5. What are some repair tips for fixing OBDII code C1101 on a Hummer?

- Repair tips include checking and replacing the brake booster vacuum sensor if faulty, inspecting and repairing any vacuum leaks in the system, and ensuring proper brake booster operation.

6. How much does it typically cost to repair OBDII code C1101 on a Hummer?

- The cost of repairing OBDII code C1101 can vary depending on the specific issue. Replacing the brake booster vacuum sensor or fixing a vacuum leak may cost a few hundred dollars, including parts and labor.

7. Can a DIY enthusiast fix OBDII code C1101 on a Hummer?

- While some basic diagnostic steps can be performed by a DIY enthusiast, addressing OBDII code C1101 may require specialized tools and expertise. It is recommended to consult a professional mechanic for proper diagnosis and repair.

8. Is it important to reset the OBDII code C1101 after repairing the issue on a Hummer?

- Yes, it is important to clear the OBDII code C1101 after fixing the underlying problem. This will reset the vehicle's system and ensure that the issue has been properly addressed.

9. How long does it take to repair OBDII code C1101 Brake Booster Vacuum Sensor Performance on a Hummer?

- The repair time for OBDII code C1101 can vary depending on the exact cause of the issue and the extent of the repair needed. It may take a few hours to a full day to complete the repair.

10. Can OBDII code C1101 on a Hummer lead to more serious brake system problems if left unresolved?

- Yes, leaving OBDII code C1101 unaddressed can lead to more serious brake system issues, such as brake failure or loss of braking power, which can jeopardize the safety of the vehicle and its occupants.