AutoCodes – Generic – U11D4

U11D4 Code - Lost Pedal Position Message

Quick Answer

This diagnostic checks the validity and availability of the gas pedal position signal which is sent by the Powertrain Control Module (PCM) via a CAN message. Common causes include Faulty Powertrain Control Module (PCM), 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: U11D4 indicates Lost Pedal Position Message.
Common causes: Common causes include Faulty Powertrain Control Module (PCM), 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 1,067

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 U11D4 Description

This diagnostic checks the validity and availability of the gas pedal position signal which is sent by the Powertrain Control Module (PCM) via a CAN message. The diagnostic checks the validity by performing a CRC and message counter check to verify the gas pedal position signal is continuously updated by the PCM and that it has a valid value. The diagnostic also checks the availability by checking the received valid bit. A signal toggle bit and a signal parity bit are sent by the PCM within the CAN message. In order to be sure the message 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 is valid, the parity bit value is set so that the sum of specific signals bits (the PDL_POS) 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) U11D4 is set or when the signal is not available, the PCM sends a SNA default value to the TCM. If the TCM reads this value then DTC U11D4 is set.

OBDII Code U11D4 - Lost Pedal Position Message - AutoCodes.com — U11D4 Code - Lost Pedal Position Message

What does this mean?

What are the Possible Causes of the DTC U11D4?

Faulty Powertrain Control Module (PCM)
Faulty Transmission Control Module (TCM)

How to Fix the DTC U11D4?

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 U11D4 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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Information for Specific Makes

U11D4 Chrysler — Lost Pedal Position Message
U11D4 Dodge — Lost Pedal Position Message
U11D4 Fiat — Lost Pedal Position Message
U11D4 Jeep — Lost Pedal Position Message
U11D4 RAM — Lost Pedal Position Message

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 U11D4 Code

1. What are the common symptoms of OBDII code U11D4, Lost Pedal Position Message?

The common symptoms of U11D4 include the check engine light coming on, reduced engine power, and potentially a disabled electronic throttle control.

2. What can cause the OBDII code U11D4, Lost Pedal Position Message to trigger?

The code U11D4 can be triggered by a faulty accelerator pedal position sensor, issues with the electronic throttle control system, damaged wiring, or a communication error between control modules.

3. How serious is the OBDII code U11D4, Lost Pedal Position Message?

U11D4 should be addressed promptly as it can lead to unsafe driving conditions, reduced vehicle performance, and potential safety hazards if left unresolved.

4. How can I diagnose the OBDII code U11D4, Lost Pedal Position Message?

Diagnosing U11D4 typically involves performing a thorough inspection of the accelerator pedal sensor, throttle body, wiring harness, and related components. Using a diagnostic scan tool to retrieve and interpret trouble codes is also recommended.

5. Can I drive my vehicle with the OBDII code U11D4, Lost Pedal Position Message?

It is not advisable to drive your vehicle with the U11D4 code present, as it can affect the performance and safety of the vehicle. It is recommended to address the issue before driving again.

6. How can I repair the OBDII code U11D4, Lost Pedal Position Message?

Repairing U11D4 may involve replacing the faulty accelerator pedal sensor, repairing damaged wiring, recalibrating the electronic throttle control system, or addressing any communication issues between control modules.

7. Will resetting the trouble codes clear the OBDII code U11D4, Lost Pedal Position Message?

Resetting the trouble codes may temporarily clear the U11D4 code, but if the underlying issue is not resolved, the code is likely to reappear once the system detects the problem again.

8. Can a DIY enthusiast fix the OBDII code U11D4, Lost Pedal Position Message?

While some simple checks and repairs can be done by DIY enthusiasts, diagnosing and repairing U11D4 may require advanced diagnostic tools and expertise. It is recommended to consult with a professional mechanic for proper diagnosis and repair.

9. How much does it cost to fix the OBDII code U11D4, Lost Pedal Position Message?

The cost of fixing U11D4 can vary depending on the root cause of the issue, the extent of repairs needed, and the labor rates in your area. It is advisable to obtain a few quotes from reputable mechanics to determine the cost.

10. Are there any preventive measures to avoid the OBDII code U11D4, Lost Pedal Position Message?

Regular maintenance, such as checking and cleaning the accelerator pedal sensor, inspecting wiring harnesses for damage, and ensuring proper electronic throttle control system function, can help prevent issues that may trigger the U11D4 code.