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U11D1 Dodge 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 Dodge 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 1,882
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on May 03, 2020
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Code U11D1 Dodge 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 Dodge - Engine Speed Message Rationality - AutoCodes.com
U11D1 Dodge Code - Engine Speed Message Rationality
What does this mean?

What are the Possible Causes of the DTC U11D1 Dodge?

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

How to Fix the DTC U11D1 Dodge?

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 Dodge 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 Dodge Code

1. What does the OBDII code U11D1 mean on a Dodge vehicle?

The U11D1 code indicates an "Engine Speed Message Rationality" fault, meaning the vehicle's modules are not receiving or processing the engine speed data correctly.

2. What are the common symptoms of the U11D1 code on a Dodge?

Symptoms may include a check engine light, erratic or rough engine performance, reduced power, or communication issues between vehicle modules.

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

Common causes include a faulty crankshaft position sensor, damaged wiring or connectors in the communication circuit, or issues with the Powertrain Control Module (PCM).

4. Can a bad crankshaft position sensor trigger the U11D1 code?

Yes, a faulty or malfunctioning crankshaft position sensor can cause incorrect engine speed data, leading to the U11D1 code.

5. How do you diagnose the U11D1 code on a Dodge vehicle?

Start by checking for loose or damaged wiring and connectors, inspect the crankshaft position sensor, and use a scan tool to monitor engine speed data for irregularities.

6. Can the U11D1 code cause drivability issues?

Yes, this code can lead to drivability issues such as rough idling, reduced performance, or even stalling in some cases.

7. Is it safe to drive with a U11D1 code on a Dodge?

It’s not recommended to drive with this code, as it may lead to further damage or unsafe driving conditions due to potential engine performance issues.

8. How do you fix the U11D1 code on a Dodge?

Repairs may include replacing a faulty crankshaft position sensor, repairing or replacing damaged wiring, or reprogramming or replacing the PCM if necessary.

9. Can a software update resolve the U11D1 code on a Dodge?

In some cases, a software update for the PCM may resolve communication issues causing the U11D1 code.

10. How much does it typically cost to fix the U11D1 code on a Dodge vehicle?

Repair costs can vary but typically range from $100 to $500, depending on whether the issue lies with the sensor, wiring, or PCM.

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