AutoCodes – Jeep – U120C Jeep

U120C Jeep 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 Jeep 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 3,605

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 Jeep Description

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

What does this mean?

What are the Possible Causes of the DTC U120C Jeep?

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 Jeep?

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 Jeep 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 Jeep code?

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Need Help with the Code?

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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 U120C Jeep Code

1. What are the common symptoms of OBDII code U120C in a Jeep related to a lost brake booster signal?

The common symptoms include a Check Engine light illuminated on the dashboard, reduced brake performance, and potential issues with the vehicle's stability control system.

2. What could cause the OBDII code U120C in a Jeep indicating a lost brake booster signal?

Potential causes of this code include a faulty brake booster sensor, damaged wiring connecting the sensor, or issues with the brake booster itself.

3. How can I diagnose the OBDII code U120C in my Jeep related to a lost brake booster signal?

Diagnosis typically involves using an OBDII scanner to read the code, checking the brake booster sensor for proper functioning, inspecting the wiring for damage, and ensuring the brake booster is operating correctly.

4. Can I continue driving my Jeep with the U120C code indicating a lost brake booster signal?

It is not recommended to drive your Jeep with this code present, as it can lead to compromised brake performance and affect the vehicle's safety systems. Prompt attention and repair are advised.

5. What are some repair tips for fixing the U120C code related to a lost brake booster signal in a Jeep?

Repair tips may include replacing the faulty brake booster sensor, repairing or replacing damaged wiring, or addressing any issues with the brake booster itself to resolve the lost signal problem.

6. Is it possible to reset the U120C code in a Jeep without fixing the underlying issue with the lost brake booster signal?

While you can clear the code with an OBDII scanner, it is crucial to address the root cause of the problem to prevent further safety risks and ensure proper vehicle operation.

7. How much does it typically cost to repair the U120C code indicating a lost brake booster signal in a Jeep?

The cost of repair can vary depending on the specific issue causing the code, the parts needed for replacement, and the labor involved. It is advisable to consult a mechanic for an accurate estimate.

8. Can a DIY enthusiast with automotive experience fix the U120C code related to a lost brake booster signal in a Jeep?

Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to address this issue. However, due to safety concerns, it is recommended to seek professional help if unsure.

9. Will the U120C code in a Jeep reset on its own after the brake booster signal is restored?

After the underlying issue causing the lost brake booster signal is fixed, the code may reset on its own after a few driving cycles. If not, an OBDII scanner can be used to clear the code manually.

10. How can I prevent the U120C code from reoccurring in my Jeep after repairing the lost brake booster signal issue?

Regular maintenance checks, ensuring proper installation of components, and promptly addressing any related warning signs can help prevent the U120C code from reoccurring in the future.