AutoCodes – Generic – C1189

C1189 Code - ABS Brake Booster

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: C1189 indicates ABS Brake Booster.
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 10,579

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 C1189 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 brake booster is defective or malfunctioning.

OBDII Code C1189 - ABS Brake Booster - AutoCodes.com — C1189 Code - ABS Brake Booster

What does this mean?

What are the Possible Causes of the DTC C1189?

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 C1189?

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 C1189 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 C1189 code?

Need more information on how to fix the C1189 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1189 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C1189 Ford — Brake Fluid Level Sensor Input Circuit Short To Ground
C1189 Infiniti — ABS Brake Booster
C1189 Lincoln — Brake Fluid Level Sensor Input Circuit Short To Ground
C1189 Mercury — Brake Fluid Level Sensor Input Circuit Short To Ground
C1189 Nissan — ABS Brake Booster

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 C1189 Code

1. What are the common symptoms of OBDII code C1189 related to the ABS Brake Booster?

When OBDII code C1189 is triggered, you may experience issues like a spongy brake pedal, poor brake performance, or the ABS system not functioning properly.

2. What are some common causes of OBDII code C1189 for the ABS Brake Booster?

Common causes of OBDII code C1189 include a faulty ABS brake booster pressure sensor, damaged wiring or connectors, low brake fluid levels, or a malfunctioning ABS module.

3. Can low brake fluid levels cause OBDII code C1189 to trigger?

Yes, low brake fluid levels can cause OBDII code C1189 to be triggered as the ABS brake booster system relies on proper fluid levels to operate efficiently.

4. How can I diagnose and repair OBDII code C1189 related to the ABS Brake Booster?

Diagnosing OBDII code C1189 involves checking the ABS brake booster pressure sensor, inspecting wiring and connectors, and ensuring proper brake fluid levels. Repair may involve sensor replacement, repairing wiring, or topping up brake fluid.

5. Is it safe to drive with OBDII code C1189 triggering related to the ABS Brake Booster?

It is not recommended to drive with OBDII code C1189 related to the ABS Brake Booster as it can affect brake performance and the functionality of the ABS system, potentially compromising safety.

6. Can a DIY enthusiast fix OBDII code C1189 for the ABS Brake Booster?

Depending on the cause, some DIY enthusiasts may be able to fix OBDII code C1189 by replacing the ABS brake booster pressure sensor, checking and repairing wiring, or topping up brake fluid. However, if unsure, it's best to consult a professional mechanic.

7. Will resetting the OBDII code C1189 related to the ABS Brake Booster make the issue go away?

Resetting the OBDII code C1189 may temporarily clear the warning light, but it will not fix the underlying issue causing the code to trigger. It's crucial to diagnose and repair the problem to ensure proper ABS brake booster function.

8. How much does it typically cost to repair OBDII code C1189 for the ABS Brake Booster at a mechanic?

The cost of repairing OBDII code C1189 related to the ABS Brake Booster can vary depending on the specific issue, parts needed, and labor costs. It's advisable to get a diagnosis and quote from a mechanic.

9. Are there any preventive maintenance tips to avoid triggering OBDII code C1189 for the ABS Brake Booster?

Regularly checking brake fluid levels, performing routine brake system inspections, and promptly addressing any brake-related issues can help prevent triggering OBDII code C1189 related to the ABS Brake Booster.

10. Can a malfunctioning ABS Brake Booster affect the overall braking system of a vehicle?

Yes, a malfunctioning ABS Brake Booster can affect the overall braking system of a vehicle by causing issues like decreased brake performance, a spongy brake pedal, or the ABS system not functioning correctly.