AutoCodes – Chrysler – U120C Chrysler

U120C Chrysler Code - Lost Brake Booster Signal

Quick Answer

The Diagnostic Trouble Code (DTC) sets when the Powertrain Control Module (PCM) doesn't receive a brake booster vacuum signal from the Anti-lock Brake System (ABS) Module over the Controller Area Network (CAN) C bus. Common causes include Faulty Brake Booster Pressure Sensor, Brake Booster Pressure Sensor harness is open or shorted, Brake Booster Pressure 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: U120C Chrysler indicates Lost Brake Booster Signal.
Common causes: Common causes include Faulty Brake Booster Pressure Sensor, Brake Booster Pressure Sensor harness is open or shorted, Brake Booster Pressure 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 1,821

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 May 03, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U120C Chrysler Description

OBDII Code U120C Chrysler - Lost Brake Booster Signal - AutoCodes.com — U120C Chrysler Code - Lost Brake Booster Signal

What does this mean?

What are the Possible Causes of the DTC U120C Chrysler?

Faulty Brake Booster Pressure Sensor
Brake Booster Pressure Sensor harness is open or shorted
Brake Booster Pressure Sensor circuit poor electrical connection
Faulty Anti-lock Brake System (ABS) Module

How to Fix the DTC U120C Chrysler?

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 U120C Chrysler 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 U120C Chrysler code?

Need more information on how to fix the U120C Chrysler code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U120C Chrysler 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 U120C Chrysler Code

1. What are the common symptoms of OBDII code U120C Chrysler (Lost Brake Booster Signal)?

- Common symptoms include the brake pedal feeling stiff or hard to press, a decrease in braking power, and the illumination of the brake warning light on the dashboard.

2. What are the possible causes of OBDII code U120C Chrysler?

- The code U120C Chrysler (Lost Brake Booster Signal) can be caused by a faulty brake booster sensor, damaged wiring or connectors in the brake booster circuit, or a software issue in the vehicle's control module.

3. How can I diagnose the issue related to OBDII code U120C Chrysler?

- Diagnosing the issue requires a scan tool to read the code, inspecting the brake booster sensor and its connections, and performing a visual inspection of the wiring harness for any signs of damage.

4. Can I continue driving with OBDII code U120C Chrysler active?

- It is not recommended to continue driving with code U120C active, as it can affect the vehicle's braking performance and compromise safety. It is best to address the issue promptly.

5. How can I repair OBDII code U120C Chrysler on my Chrysler vehicle?

- The repair process may involve replacing the brake booster sensor, repairing or replacing damaged wiring or connectors, and clearing the code using a scan tool. In some cases, a software update may be required.

6. Are there any DIY tips for addressing OBDII code U120C Chrysler?

- DIY tips include checking for loose connections, ensuring the brake booster sensor is securely in place, and inspecting the wiring harness for any visible damage before seeking professional help.

7. Can a faulty brake booster sensor cause other issues besides triggering code U120C Chrysler?

- Yes, a faulty brake booster sensor can lead to poor braking performance, inconsistent brake pedal feel, and potentially compromise the vehicle's overall safety systems.

8. Is it safe to drive the vehicle to a repair shop with code U120C Chrysler active?

- It is advisable to exercise caution and drive carefully to a repair shop when code U120C Chrysler is active. Avoid sudden braking and maintain a safe distance from other vehicles.

9. How long does it typically take to repair OBDII code U120C Chrysler?

- The repair time for code U120C Chrysler can vary depending on the exact cause of the issue and the availability of replacement parts. In general, it may take a few hours to a day for the repair.

10. Can I prevent OBDII code U120C Chrysler from recurring in the future?

- Regular vehicle maintenance, such as checking the brake system components for wear and tear, ensuring proper electrical connections, and addressing any issues promptly, can help prevent the recurrence of code U120C Chrysler.