AutoCodes – Jeep – U11C1 Jeep

U11C1 Jeep Code - Reductant Control Module Received Implausible Data From ECM/PCM

Quick Answer

The Diesel Exhaust Fluid (DEF) Dosing Control Unit is used to control the operation and monitoring of the Diesel Exhaust Fluid system. Common causes include Faulty Diesel Exhaust Fluid (DEF) Dosing Control Unit, Diesel Exhaust Fluid Dosing Control Unit harness is open or shorted, Diesel Exhaust Fluid Dosing Control Unit circuit poor electrical connection. 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: U11C1 Jeep indicates Reductant Control Module Received Implausible Data From ECM/PCM.
Common causes: Common causes include Faulty Diesel Exhaust Fluid (DEF) Dosing Control Unit, Diesel Exhaust Fluid Dosing Control Unit harness is open or shorted, Diesel Exhaust Fluid Dosing Control Unit circuit poor electrical connection.
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 730

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 Apr 28, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U11C1 Jeep Description

The Diesel Exhaust Fluid (DEF) Dosing Control Unit is used to control the operation and monitoring of the Diesel Exhaust Fluid system. The DEF Dosing Control Unit is the central control for the aftertreatment diesel exhaust fluid dosing system, and handles the tank level sensing, tank temperature sensing, line heating, and tank heating. The DEF Dosing Control Unit shares information with the Powertrain Control Module (PCM) over the J1939 Data Link. The PCM will illuminate the MIL light after the diagnostics runs and fails for two consecutive trips. The PCM will turn off the MIL light when the monitor runs and passes in three consecutive key cycles. The Diagnostic Trouble Code (DTC) sets when the DEF Dosing Control Unit cannot interpret Data link messages from the Powertrain Control Module.

OBDII Code U11C1 Jeep - Reductant Control Module Received Implausible Data From ECM/PCM - AutoCodes.com — U11C1 Jeep Code - Reductant Control Module Received Implausible Data From ECM/PCM

What does this mean?

What are the Possible Causes of the DTC U11C1 Jeep?

Faulty Diesel Exhaust Fluid (DEF) Dosing Control Unit
Diesel Exhaust Fluid Dosing Control Unit harness is open or shorted
Diesel Exhaust Fluid Dosing Control Unit circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC U11C1 Jeep?

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 U11C1 Jeep 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 U11C1 Jeep code?

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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 U11C1 Jeep Code

1. What are the common symptoms of OBDII code U11C1 in a Jeep?

- Common symptoms include the check engine light illuminated on the dashboard, reduced engine performance, and potential issues with the vehicle's emissions system.

2. What could cause the OBDII code U11C1 to trigger in a Jeep?

- The U11C1 code may trigger due to a communication error between the Reductant Control Module and the Engine Control Module/Powertrain Control Module, faulty sensors, wiring issues, or software glitches.

3. How serious is the U11C1 fault code in a Jeep?

- The U11C1 code is related to the vehicle's emissions system and should be addressed promptly to prevent potential damage to the catalytic converter and ensure the vehicle meets emissions standards.

4. Can I continue driving my Jeep with the U11C1 fault code present?

- It is generally not recommended to continue driving the vehicle with the U11C1 code active, as it may lead to reduced fuel efficiency, engine performance issues, and potential damage to the emissions system components.

5. How can I diagnose and repair the U11C1 code in my Jeep?

- Diagnosing the U11C1 code typically involves using an OBDII scanner to retrieve the specific fault codes, inspecting the wiring and connections between the Reductant Control Module and ECM/PCM, and testing the sensors involved in the reductant control system.

6. Are there any DIY repair tips for fixing the U11C1 fault code in a Jeep?

- DIY repair tips may include checking for loose or damaged wiring connections, ensuring proper sensor operation, and resetting the fault codes using an OBDII scanner after addressing any identified issues.

7. Can a software update fix the U11C1 code in a Jeep?

- In some cases, a software update provided by the manufacturer may address communication issues between modules and resolve the U11C1 fault code without the need for replacing any components.

8. What should I do if the U11C1 fault code persists after attempted repairs?

- If the U11C1 code persists after attempted repairs, it is advisable to seek assistance from a qualified mechanic or dealership with specialized diagnostic equipment to further investigate and resolve the issue.

9. Will driving with the U11C1 fault code affect my Jeep's fuel economy?

- Driving with the U11C1 fault code may lead to reduced fuel economy due to potential engine performance issues and improper operation of the emissions control system.

10. How much does it typically cost to repair the U11C1 fault code in a Jeep?

- The cost of repairing the U11C1 fault code can vary depending on the root cause of the issue, the need for replacement parts, and labor costs. It is recommended to obtain quotes from reputable mechanics or dealerships for an accurate estimate.