AutoCodes – RAM – U11C8 RAM

U11C8 RAM Code - Lost Engine Coolant Temperature Message

Quick Answer

This diagnostic determines the availability of the Engine Coolant Temperature (ECT) signal sent by the Powertrain Control Module (PCM) via a CAN message. Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted, Transmission Control Module 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: U11C8 RAM indicates Lost Engine Coolant Temperature Message.
Common causes: Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted, Transmission Control Module 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 493

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 U11C8 RAM Description

This diagnostic determines the availability of the Engine Coolant Temperature (ECT) signal sent by the Powertrain Control Module (PCM) via a CAN message. The diagnostic determines the availability by checking the received value is not equal to the Signal Not Available (SNA) default value. When the signal is not available, the PCM sends a Signal Not Available (SNA) default value to the Transmission Control Module (TCM). If the TCM reads this value then the Diagnostic Trouble Code (DTC) U11C8 is set.

OBDII Code U11C8 RAM - Lost Engine Coolant Temperature Message - AutoCodes.com — U11C8 RAM Code - Lost Engine Coolant Temperature Message

What does this mean?

What are the Possible Causes of the DTC U11C8 RAM?

Faulty Transmission Control Module (TCM)
Transmission Control Module harness is open or shorted
Transmission Control Module circuit poor electrical connection

How to Fix the DTC U11C8 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 U11C8 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 U11C8 RAM Code

1. What are the common symptoms of OBDII code U11C8 (RAM Lost Engine Coolant Temperature Message)?

The common symptoms include the check engine light illuminating, temperature gauge not working properly, and potential overheating issues.

2. What are the possible causes of OBDII code U11C8 (RAM Lost Engine Coolant Temperature Message)?

Potential causes include a faulty engine coolant temperature sensor, wiring issues, a malfunctioning powertrain control module (PCM), or a software glitch.

3. How can I diagnose the OBDII code U11C8 (RAM Lost Engine Coolant Temperature Message)?

Diagnosis typically involves using a diagnostic scanner to retrieve the code, checking the coolant temperature sensor and related wiring for faults, and testing the PCM for proper functionality.

4. Is it safe to drive with OBDII code U11C8 (RAM Lost Engine Coolant Temperature Message) present?

It is not recommended to drive with this code present, as it can lead to inaccurate temperature readings and potential engine overheating issues.

5. How can I repair OBDII code U11C8 (RAM Lost Engine Coolant Temperature Message)?

Repair options include replacing the engine coolant temperature sensor, repairing any damaged wiring, reprogramming the PCM, or performing a software update as recommended by the manufacturer.

6. Can a DIY enthusiast fix OBDII code U11C8 (RAM Lost Engine Coolant Temperature Message)?

While some basic diagnostics and repairs can be done by DIY enthusiasts, it is advisable to consult a professional mechanic for accurate diagnosis and repair of this code.

7. How much does it cost to repair OBDII code U11C8 (RAM Lost Engine Coolant Temperature Message)?

Repair costs can vary depending on the specific cause of the code, but it may range from $100 to $300 for parts and labor.

8. Will OBDII code U11C8 (RAM Lost Engine Coolant Temperature Message) affect fuel efficiency?

If left unresolved, this code can potentially impact fuel efficiency as it may cause the engine to run inefficiently due to inaccurate temperature readings.

9. Can OBDII code U11C8 (RAM Lost Engine Coolant Temperature Message) cause permanent damage to the engine?

Continuously driving with this code present can lead to engine overheating and potential damage, so it is important to address the issue promptly to prevent any permanent damage.

10. How often should I check the engine coolant temperature sensor to prevent OBDII code U11C8 (RAM Lost Engine Coolant Temperature Message)?

It is recommended to include the engine coolant temperature sensor in your regular vehicle maintenance schedule and have it checked during routine inspections or whenever you experience cooling system issues.