AutoCodes – RAM – U11D2 RAM

U11D2 RAM Code - Lost Brake Signal

Quick Answer

This diagnostic checks the validity of the brake switch message which is sent by the Anti-lock Braking System (ABS) Module via Controller Area Network (CAN) network. Common causes include Faulty Powertrain Control Module (PCM), Faulty Anti-lock Braking System (ABS) Module, Faulty Transmission Control Module (TCM). 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: U11D2 RAM indicates Lost Brake Signal.
Common causes: Common causes include Faulty Powertrain Control Module (PCM), Faulty Anti-lock Braking System (ABS) Module, Faulty Transmission Control Module (TCM).
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 428

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 U11D2 RAM Description

This diagnostic checks the validity of the brake switch message which is sent by the Anti-lock Braking System (ABS) Module via Controller Area Network (CAN) network. The diagnostic checks the validity by performing a CRC and message counter check to verify the brake switch message is continuously updated by the ABS module and it has a valid value. A signal toggle bit and a signal parity bit are sent by the ABS module within the CAN message. In order to be sure the message content is continuously updated, the value of the toggle bit changes from 0 to 1 and vice versa every two messages. In order to be sure the message content is valid, the parity bit value is set so that the sum of specific signal bits (PcmBrkSw) of the message content plus the toggle bit plus the parity bit is an even number. If the toggle bit value does not change or the signal parity is not verified for a calibrated amount of time then the Diagnostic Trouble Code (DTC) U11D2 is set.

OBDII Code U11D2 RAM - Lost Brake Signal - AutoCodes.com — U11D2 RAM Code - Lost Brake Signal

What does this mean?

What are the Possible Causes of the DTC U11D2 RAM?

Faulty Powertrain Control Module (PCM)
Faulty Anti-lock Braking System (ABS) Module
Faulty Transmission Control Module (TCM)

How to Fix the DTC U11D2 RAM?

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 U11D2 RAM 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.

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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 U11D2 RAM Code

1. What are the common symptoms of OBDII code U11D2 RAM Lost Brake Signal?

The common symptoms include the brake warning light on the dashboard illuminating, loss of brake lights, and potential issues with the vehicle's brake system.

2. What could cause the OBDII code U11D2 RAM Lost Brake Signal?

Possible causes of this code include a faulty brake light switch, wiring issues in the brake light circuit, a malfunctioning brake control module, or a problem with the vehicle's CAN communication system.

3. How can I diagnose the U11D2 RAM Lost Brake Signal code?

To diagnose this code, you can use an OBDII scanner to read the code and check for any additional related codes. You can also inspect the brake light switch, test the brake lights, and check the wiring for any visible damage or corrosion.

4. What are the repair options for the U11D2 RAM Lost Brake Signal code?

Repair options may include replacing the brake light switch, repairing or replacing damaged wiring, checking and resetting the brake control module, and ensuring proper communication within the vehicle's network.

5. Can driving with the U11D2 RAM Lost Brake Signal code pose any safety risks?

Driving with this code can be dangerous as it can lead to a loss of brake lights, potentially causing accidents due to decreased visibility to other drivers. It is important to address this issue promptly.

6. How much does it typically cost to repair the U11D2 RAM Lost Brake Signal code?

The cost of repairing this issue can vary depending on the underlying cause and the labor rates in your area. It is recommended to get a diagnostic inspection to determine the exact repair cost.

7. Will resetting the OBDII code U11D2 RAM fix the issue temporarily?

Resetting the code may temporarily turn off the warning light, 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.

8. Can I repair the U11D2 RAM Lost Brake Signal code myself, or do I need a professional mechanic?

While some simple checks like inspecting the brake light switch or checking for loose connections can be done by DIY enthusiasts, diagnosing and repairing complex issues may require the expertise of a professional mechanic.

9. Are there any preventive measures to avoid encountering the U11D2 RAM Lost Brake Signal code in the future?

Regularly inspecting and maintaining the brake light system, checking for any signs of wear or damage in the wiring, and addressing any brake system issues promptly can help prevent encountering this code in the future.

10. How urgent is it to address the U11D2 RAM Lost Brake Signal code?

It is advisable to address this code promptly to ensure the safe operation of your vehicle. Ignoring brake-related issues can lead to safety hazards on the road and potential brake system failures.