AutoCodes – RAM – U11D4 RAM

U11D4 RAM 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 RAM 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 472

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

What does this mean?

What are the Possible Causes of the DTC U11D4 RAM?

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

How to Fix the DTC U11D4 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 U11D4 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 U11D4 RAM Code

What does the OBDII code U11D4 mean?

The OBDII code U11D4 indicates a "Lost Pedal Position Message," which means that the vehicle's engine control module (ECM) is not receiving a valid signal from the accelerator pedal position sensor.

What are some common symptoms associated with the U11D4 code?

Common symptoms include a warning light on the dashboard, reduced engine power, unresponsive acceleration, or erratic engine behavior.

What could cause the U11D4 code to trigger?

Possible causes include a faulty accelerator pedal position sensor, damaged wiring or connectors, issues with the engine control module, or problems with the vehicle's communication network.

How can I diagnose the U11D4 code?

To diagnose the U11D4 code, use an OBDII scanner to confirm the code and check for any related codes. Inspect the accelerator pedal position sensor, wiring, and connectors for damage or corrosion.

What should I check first when troubleshooting the U11D4 code?

Start by inspecting the accelerator pedal position sensor and its wiring for any signs of wear, damage, or loose connections, as these are the most common culprits.

Can I drive my vehicle with the U11D4 code?

It is not recommended to drive your vehicle with the U11D4 code, as it may lead to reduced power and potentially unsafe driving conditions.

What repairs are typically needed to fix the U11D4 code?

Repairs may include replacing the accelerator pedal position sensor, repairing damaged wiring, or reprogramming or replacing the ECM if it is found to be faulty.

Is it necessary to reset the check engine light after fixing the U11D4 code?

Yes, after addressing the issue, you'll need to reset the check engine light using an OBDII scanner or by disconnecting the battery for a short period.

How much could it cost to repair issues related to the U11D4 code?

Repair costs can vary widely based on the underlying issue; replacing a sensor might cost between $100 to $300, while more extensive repairs could exceed $1,000.

Can the U11D4 code affect other systems in the vehicle?

Yes, since the accelerator pedal position is crucial for engine performance, issues with this code can affect vehicle acceleration and overall drivability.