AutoCodes – RAM – U1118 RAM

U1118 RAM Code - Lost Engine Message

Quick Answer

The Transmission Control Module (TCM) receives information from the Engine, Anti-lock Brake System, and the Electronic Gear Shift control modules over the Controlled Area Network (CAN) C bus. 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: U1118 RAM indicates Lost Engine 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 532

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 22, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1118 RAM Description

The Transmission Control Module (TCM) receives information from the Engine, Anti-lock Brake System, and the Electronic Gear Shift control modules over the Controlled Area Network (CAN) C bus. The CAN C bus is a high-speed communication bus that allows real-time control capability between various controllers. Most messages are sent every 20 mSec, this means critical information can be shared between multiple controllers almost instantaneously. The CAN C bus is a two-wire bus with a CAN (+) and a CAN (-) circuit. To reduce the potential of radio and other electrical noise interference, the CAN Bus circuit wiring is manufactured using a twisted pair configuration within the electrical wiring harness. The Diagnostic Trouble Code (DTC) will set if a valid CAN ID was not received in the required time from the ECM/PCM.

OBDII Code U1118 RAM - Lost Engine Message - AutoCodes.com — U1118 RAM Code - Lost Engine Message

What does this mean?

What are the Possible Causes of the DTC U1118 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 U1118 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 U1118 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 U1118 RAM Code

1. What are the common symptoms of OBDII code U1118 RAM Lost Engine Message?

The common symptoms of U1118 RAM Lost Engine Message may include engine stalling, rough idling, reduced engine performance, and in some cases, the vehicle may not start.

2. What are the possible causes of OBDII code U1118 RAM Lost Engine Message?

The possible causes of U1118 RAM Lost Engine Message include a malfunctioning Engine Control Module (ECM), wiring issues, loose connections, or a faulty communication network within the vehicle.

3. How can I diagnose OBDII code U1118 RAM Lost Engine Message?

Diagnosing U1118 RAM Lost Engine Message involves using a scan tool to retrieve the code, checking for any related codes, inspecting the wiring and connections, and testing the ECM to determine the root cause of the issue.

4. Can I still drive my vehicle with OBDII code U1118 RAM Lost Engine Message?

It is not recommended to drive your vehicle with U1118 RAM Lost Engine Message as it can lead to potential engine performance issues and safety concerns. It's best to address the problem promptly.

5. How can I repair OBDII code U1118 RAM Lost Engine Message?

Repairing U1118 RAM Lost Engine Message may involve fixing any wiring or connection issues, replacing the Engine Control Module (ECM) if needed, or resetting the communication network within the vehicle.

6. Can a DIY enthusiast fix OBDII code U1118 RAM Lost Engine Message?

While some basic troubleshooting steps can be performed by a DIY enthusiast, diagnosing and repairing U1118 RAM Lost Engine Message may require specialized tools and expertise, so it's recommended to consult a professional mechanic.

7. Is resetting the ECM an effective way to clear OBDII code U1118 RAM Lost Engine Message?

Resetting the ECM may temporarily clear the code, but if the underlying issue causing U1118 RAM Lost Engine Message is not addressed, the code is likely to reappear. It's important to diagnose and fix the root cause of the problem.

8. How long does it typically take to repair OBDII code U1118 RAM Lost Engine Message?

The time it takes to repair U1118 RAM Lost Engine Message can vary depending on the exact cause of the issue and the availability of parts. It's best to consult a mechanic for a more accurate estimate.

9. Can extreme weather conditions trigger OBDII code U1118 RAM Lost Engine Message?

Extreme weather conditions can potentially affect the communication network in the vehicle, leading to issues like U1118 RAM Lost Engine Message. Ensuring proper insulation and protection of wiring can help prevent such problems.

10. What should I do if OBDII code U1118 RAM Lost Engine Message keeps coming back after repairs?

If U1118 RAM Lost Engine Message keeps reappearing after repairs, it indicates that the root cause of the issue may not have been fully resolved. In such cases, a thorough reevaluation of the diagnosis and repair process is necessary.