AutoCodes – Generic – C1181

C1181 Code - ABS Active Booster Response

Quick Answer

The Active Brake Booster consists of a vacuum booster, an active booster control group, and a delta stroke sensor. Common causes include Faulty Active Booster (Power Brake Booster), Faulty ABS Control Unit/Actuator, ABS Control Unit/Actuator harness is open or shorted. 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: C1181 indicates ABS Active Booster Response.
Common causes: Common causes include Faulty Active Booster (Power Brake Booster), Faulty ABS Control Unit/Actuator, ABS Control Unit/Actuator harness is open or shorted.
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 6,914

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 Oct 05, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1181 Description

The Active Brake Booster consists of a vacuum booster, an active booster control group, and a delta stroke sensor. If a brake booster system malfunction occurs due to loss of vacuum, the delta stroke sensor will signal the ABS actuator and electric unit (control unit) that a booster malfunction has occurred. The active booster then applies supplemental force to the master cylinder relative to the amount of force exerted on the brake pedal. The Diagnostic Trouble Code (DTC) will be set when the Active Booster response is malfunctioning, or the signal line of the active booster response is open or shorted.

OBDII Code C1181 - ABS Active Booster Response - AutoCodes.com — C1181 Code - ABS Active Booster Response

What does this mean?

What are the Possible Causes of the DTC C1181?

Faulty Active Booster (Power Brake Booster)
Faulty ABS Control Unit/Actuator
ABS Control Unit/Actuator harness is open or shorted
ABS Control Unit/Actuator circuit poor electrical connection

How to Fix the DTC C1181?

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 C1181 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 C1181 code?

Need more information on how to fix the C1181 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1181 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C1181 Infiniti — ABS Active Booster Response
C1181 Nissan — ABS Active Booster Response

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 C1181 Code

1. What are the common symptoms of OBDII code C1181 (ABS Active Booster Response)?

The common symptoms of OBDII code C1181 include the ABS warning light illuminating on the dashboard, decreased braking performance, and potential activation of the vehicle's emergency brake assist system.

2. What are the possible causes of OBDII code C1181?

Possible causes of OBDII code C1181 include a faulty active brake booster, damaged wiring or connectors in the ABS system, low brake fluid level, or issues with the vehicle's hydraulic brake system.

3. How can I diagnose OBDII code C1181 at home?

To diagnose OBDII code C1181 at home, you can use an OBDII scanner to retrieve the trouble codes from the vehicle's computer. Additionally, visually inspect the ABS system components for any visible damage or loose connections.

4. Is it safe to continue driving with OBDII code C1181 present?

It is not recommended to continue driving with OBDII code C1181 present, as it may lead to decreased braking performance and compromise vehicle safety. It is best to address the issue promptly to ensure safe operation of the vehicle.

5. How can I repair OBDII code C1181?

Repairing OBDII code C1181 may involve replacing the faulty active brake booster, repairing or replacing damaged wiring or connectors, checking and refilling the brake fluid level, or addressing any issues in the hydraulic brake system.

6. Can a DIY enthusiast fix OBDII code C1181?

While some DIY enthusiasts may have the skills to address OBDII code C1181, it is recommended to have the issue diagnosed and repaired by a qualified mechanic or technician to ensure proper and safe resolution of the problem.

7. Will resetting the trouble codes clear OBDII code C1181?

Resetting the trouble codes may temporarily clear OBDII code C1181, but if the underlying issue is not addressed, the code is likely to reappear. It is important to diagnose and repair the root cause of the problem to prevent future occurrences.

8. Are there any preventive measures to avoid OBDII code C1181?

To prevent OBDII code C1181, regular maintenance of the ABS system, including checking brake fluid levels and inspecting for any signs of damage, is essential. Promptly addressing any issues with the braking system can help prevent this trouble code.

9. How much does it typically cost to repair OBDII code C1181?

The cost to repair OBDII code C1181 can vary depending on the underlying cause of the issue, the extent of the repairs needed, and labor rates in your area. It is advisable to obtain quotes from multiple repair shops to compare costs.

10. Can OBDII code C1181 be a safety concern?

Yes, OBDII code C1181 can be a safety concern as it may result in decreased braking performance and potentially compromise the vehicle's ability to stop effectively. It is important to address this code promptly to ensure safe operation of the vehicle.