AutoCodes – Jeep – U11D2 Jeep

U11D2 Jeep 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 Jeep 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 429

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 Jeep 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 Jeep - Lost Brake Signal - AutoCodes.com — U11D2 Jeep Code - Lost Brake Signal

What does this mean?

What are the Possible Causes of the DTC U11D2 Jeep?

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

How to Fix the DTC U11D2 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 U11D2 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 U11D2 Jeep 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 U11D2 Jeep Code

1. What are the common symptoms of OBDII code U11D2 on a Jeep related to a lost brake signal?

- Common symptoms include the brake warning light illuminating on the dashboard, loss of brake lights, and potential issues with the vehicle's stability control system.

2. What could cause the U11D2 code indicating a lost brake signal in a Jeep?

- Possible causes may include a faulty brake light switch, damaged wiring or connectors in the brake system, or a malfunctioning brake control module.

3. How can I diagnose the issue causing the U11D2 code on my Jeep?

- To diagnose the problem, you can start by checking the brake light switch for proper operation, inspecting the wiring for any damage, and using a diagnostic scan tool to identify the specific fault.

4. Is it safe to drive my Jeep with the U11D2 code triggered by a lost brake signal?

- It is not recommended to drive the vehicle with this issue, as the loss of brake signal can compromise safety by affecting brake light visibility to other drivers and potentially impacting the vehicle's braking performance.

5. What should I do if my Jeep displays the U11D2 code for a lost brake signal?

- It is advisable to have the vehicle inspected by a qualified mechanic to diagnose and repair the underlying cause of the code to ensure the safe operation of the brake system.

6. Can I reset the U11D2 code related to a lost brake signal on my Jeep without repairing the issue?

- While you can clear the code using a diagnostic scan tool, it is essential to address the root cause of the problem to prevent potential safety hazards and ensure the proper functioning of the brake system.

7. Are there any DIY repair tips for fixing the U11D2 code on a Jeep indicating a lost brake signal?

- DIY enthusiasts with automotive repair experience may attempt to check and replace the brake light switch or inspect the wiring for damage, but it is recommended to seek professional help for accurate diagnosis and repair.

8. Will the U11D2 code on my Jeep reset itself after the issue with the lost brake signal is resolved?

- Once the underlying problem causing the lost brake signal is fixed, you can clear the code using a scan tool, and it should not reappear if the repair is successful.

9. Is the repair for the U11D2 code related to a lost brake signal covered under warranty for Jeep vehicles?

- Depending on the vehicle's warranty status, the repair for the U11D2 code may be covered if the issue is deemed a manufacturing defect or covered under the applicable warranty terms.

10. Can extreme weather conditions or water exposure trigger the U11D2 code indicating a lost brake signal on a Jeep?

- Yes, exposure to moisture or extreme weather conditions can potentially lead to issues with the brake system components, such as the brake light switch or wiring, resulting in the triggering of the U11D2 code.