AutoCodes – RAM – U11D1 RAM

U11D1 RAM 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 RAM 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 655

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

What does this mean?

What are the Possible Causes of the DTC U11D1 RAM?

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

How to Fix the DTC U11D1 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 U11D1 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 U11D1 RAM Code

1. What does the OBDII code U11D1 mean for RAM vehicles?

U11D1 indicates a loss of communication or a mismatch in the data related to engine speed between the Powertrain Control Module (PCM) and other modules.

2. What are common symptoms of the U11D1 code in a RAM vehicle?

Symptoms may include the check engine light turning on, erratic engine behavior, poor performance, or issues with the transmission shifting.

3. What causes the U11D1 code to appear on a RAM vehicle?

Common causes include faulty wiring or connectors, a malfunctioning Crankshaft Position Sensor, a bad PCM, or issues with the Controller Area Network (CAN) bus communication.

4. Can the U11D1 code affect drivability in a RAM vehicle?

Yes, it can lead to drivability issues such as rough idling, engine stalling, or transmission problems due to incorrect engine speed data being shared.

5. How can I diagnose the U11D1 code in my RAM truck?

Diagnosis typically involves checking the wiring and connectors for damage, testing the Crankshaft Position Sensor, and verifying CAN bus communication with a scan tool.

6. Is the U11D1 code specific to RAM vehicles?

While the U11D1 code is common in RAM vehicles, it may also appear in other vehicles that use similar communication protocols.

7. What tools are needed to troubleshoot the U11D1 code on a RAM?

A professional scan tool with live data capabilities, a multimeter for testing voltage and continuity, and access to the vehicleâ€™s wiring diagrams are essential.

8. Can a faulty PCM cause the U11D1 code on a RAM vehicle?

Yes, a failing PCM can result in the U11D1 code if it is unable to process or communicate engine speed data properly.

9. What repairs are commonly required to fix the U11D1 code?

Repairs may include repairing or replacing damaged wiring or connectors, replacing a faulty Crankshaft Position Sensor, or reprogramming or replacing the PCM.

10. Can clearing the U11D1 code solve the problem in a RAM vehicle?

Clearing the code may temporarily reset the check engine light, but the underlying issue must be addressed to prevent the code from returning.