U120C Code - Lost Brake Booster Signal
Quick Answer
The U120C code indicates that there is a communication error between the brake booster and the vehicle's electronic control module (ECM). Common causes include Faulty brake booster sensor, Damaged wiring or connectors in the brake booster circuit, Malfunctioning ECM. 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 indicates Lost Brake Booster Signal.
- Common causes
- Common causes include Faulty brake booster sensor, Damaged wiring or connectors in the brake booster circuit, Malfunctioning ECM.
- 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 U120C Description
The U120C code indicates that there is a communication error between the brake booster and the vehicle's electronic control module (ECM). The brake booster is a critical component of the vehicle's braking system, responsible for amplifying the force applied to the brake pedal. When the ECM loses the signal from the brake booster, it can lead to issues with brake performance and safety.
Common Causes of U120C
- Faulty brake booster sensor
- Damaged wiring or connectors in the brake booster circuit
- Malfunctioning ECM
- Software glitch in the vehicle's control module
- Corrosion or water damage in the brake booster system
Symptoms of U120C
- Illuminated brake warning light on the dashboard
- Increased brake pedal effort required to stop the vehicle
- Reduced brake assist or brake boost functionality
- Inconsistent brake response or delayed braking
- ABS system may be disabled or malfunctioning
How to Fix U120C
- Perform a diagnostic scan to retrieve the U120C code and pinpoint the source of the communication error.
- Inspect the brake booster sensor, wiring, and connectors for any signs of damage or corrosion.
- Test the ECM and control module for proper functioning and communication with the brake booster.
- Replace any faulty components, such as the brake booster sensor or damaged wiring.
- Clear the U120C code from the ECM's memory and perform a road test to verify that the issue has been resolved.
Cost to Fix U120C
The cost of repairing a U120C code related to a lost brake booster signal can vary depending on the specific cause of the issue and the make and model of the vehicle. In general, the repair costs can range from $200 to $500, including parts and labor. However, it's important to note that diagnosis time and labor rates at auto repair shops can differ, with hourly rates typically ranging from $80 to $150. It's advisable to consult with a professional mechanic or service center to obtain a more accurate estimate based on your vehicle's needs.
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Code U120C Information for Specific Makes
- U120C Chrysler — Lost Brake Booster Signal
- U120C Dodge — Lost Brake Booster Signal
- U120C Jeep — Lost Brake Booster Signal
- U120C RAM — Lost Brake Booster Signal
Frequently Asked Questions about U120C Code
1. What are the common symptoms of OBDII code U120C (Lost Brake Booster Signal)?
Symptoms of U120C may include the brake pedal feeling stiff or hard to press, the brake system warning light illuminated on the dashboard, and potential issues with brake performance.
2. What can cause the OBDII code U120C (Lost Brake Booster Signal) to occur?
This code is often triggered by a faulty brake booster sensor, a loose or damaged wiring connection, or issues with the brake booster itself.
3. How can I diagnose the OBDII code U120C (Lost Brake Booster Signal)?
Diagnosing U120C typically involves using a diagnostic scanner to read the code, checking the brake booster sensor and its wiring for any visible damage, and conducting a thorough inspection of the brake booster system.
4. Can driving with the OBDII code U120C (Lost Brake Booster Signal) cause further damage to the vehicle?
Continuing to drive with U120C present can potentially compromise brake performance and safety. It is recommended to address this issue promptly to avoid any safety risks.
5. How can I repair the OBDII code U120C (Lost Brake Booster Signal)?
Repairing U120C may involve replacing the faulty brake booster sensor, repairing any damaged wiring connections, or addressing issues with the brake booster itself. It is advisable to consult a professional mechanic for proper diagnosis and repair.
6. Is it safe to continue driving with the OBDII code U120C (Lost Brake Booster Signal) if the brakes feel normal?
Even if the brakes feel normal, it is not recommended to ignore U120C as it can lead to potential brake system failures. It's best to address the underlying issue promptly to ensure safe operation of the vehicle.
7. Can a DIY enthusiast fix the OBDII code U120C (Lost Brake Booster Signal) at home?
While some DIY enthusiasts may have the necessary skills to address U120C, it is a critical safety issue related to the brake system. It is generally recommended to seek professional assistance to ensure proper diagnosis and repair.
8. How long does it typically take to repair the OBDII code U120C (Lost Brake Booster Signal)?
The repair time for U120C can vary depending on the underlying cause and the extent of the issue. It may take a few hours to a day to diagnose and repair the problem properly.
9. Are there any preventative measures to avoid the OBDII code U120C (Lost Brake Booster Signal) from occurring?
Regular maintenance of the brake system, including checking for any signs of wear or damage, can help prevent issues that may trigger U120C. Promptly addressing any brake-related symptoms can also help avoid this code.
10. Can a low brake fluid level cause the OBDII code U120C (Lost Brake Booster Signal) to appear?
A low brake fluid level is not a direct cause of U120C, but it can lead to other brake system issues that may trigger this code. It's essential to maintain proper brake fluid levels and address any leaks or malfunctions promptly to prevent related problems.
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