AutoCodes – Generic – U11D1

U11D1 Code - Engine Speed Message Rationality

Quick Answer

This diagnostic checks the validity, availability and rationality of the engine speed signal which is sent by the Powertrain Control Module (PCM) via a Controller Area Network (CAN) message. Common causes include Faulty Powertrain Control Module (PCM), Check Body Control Module (BCM) Codes, 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: U11D1 indicates Engine Speed Message Rationality.
Common causes: Common causes include Faulty Powertrain Control Module (PCM), Check Body Control Module (BCM) Codes, 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 1,545

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 U11D1 Description

This diagnostic checks the validity, availability and rationality of the engine speed signal which is sent by the Powertrain Control Module (PCM) via a Controller Area Network (CAN) message. The diagnostic checks the validity by performing a CRC and message counter check to be sure the engine speed signal is continuously updated by the PCM and that it has a valid value. The diagnostic also checks the availability by checking the received value is not equal to the Signal Not Available (SNA) default value. Then the diagnostic checks the rationality by comparing the received engine speed to the odd or even clutch speed and to the odd or even input shaft speed. The clutch speed is measured directly from the clutch speed sensor and the input shaft speed is calculated based upon the driveline speed multiplied by the actual gear ratio. Any reference to odd or even is directly related to the actual odd or even gear engaged.

OBDII Code U11D1 - Engine Speed Message Rationality - AutoCodes.com — U11D1 Code - Engine Speed Message Rationality

What does this mean?

What are the Possible Causes of the DTC U11D1?

Faulty Powertrain Control Module (PCM)
Check Body Control Module (BCM) Codes
Faulty Transmission Control Module (TCM)

How to Fix the DTC U11D1?

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 U11D1 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 U11D1 code?

Need more information on how to fix the U11D1 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U11D1 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U11D1 Chrysler — Engine Speed Message Rationality
U11D1 Dodge — Engine Speed Message Rationality
U11D1 Fiat — Engine Speed Message Rationality
U11D1 Jeep — Engine Speed Message Rationality
U11D1 RAM — Engine Speed Message Rationality

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 U11D1 Code

1. What are the common symptoms of OBDII code U11D1 (Engine Speed Message Rationality)?

- Common symptoms include engine misfires, rough idling, reduced fuel efficiency, and potential stalling.

2. What can cause the OBDII code U11D1 to trigger?

- This code is typically triggered by communication errors between the engine control module (ECM) and other modules in the vehicle.

3. How serious is the U11D1 engine speed message rationality code?

- While the code itself may not cause immediate danger, it can lead to drivability issues and potentially affect the performance of the vehicle.

4. How can I diagnose the U11D1 code related to engine speed message rationality?

- Diagnosis involves checking the wiring connections, inspecting the ECM for any faults, and using a diagnostic scanner to read the code and related data.

5. What are some possible repair tips for fixing the U11D1 code?

- Repair tips may include checking and repairing any damaged wiring, ensuring proper connections, updating software if necessary, and resetting the code after repairs.

6. Can a DIY enthusiast fix the U11D1 code issue at home?

- Depending on the underlying cause, some DIY enthusiasts may be able to address the U11D1 code by following diagnostic procedures and making necessary repairs.

7. Is it safe to continue driving with the U11D1 code present?

- It is generally not recommended to drive with the U11D1 code present, as it can lead to further damage and affect the overall performance of the vehicle.

8. How much does it typically cost to repair the U11D1 engine speed message rationality code?

- Repair costs can vary depending on the cause of the issue, but they may range from a simple wiring repair to more complex ECM replacements, potentially costing several hundred dollars.

9. Can a faulty sensor cause the U11D1 code to appear?

- While a faulty sensor is not the most common cause of the U11D1 code, it can contribute to communication errors and trigger the code in some cases.

10. How long does it usually take to repair the U11D1 code issue?

- The repair time for the U11D1 code can vary based on the complexity of the underlying issue, but it may take anywhere from a few hours to a full day, depending on the extent of repairs needed.