AutoCodes – Jeep – U1118 Jeep

U1118 Jeep 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 Jeep 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 3,090

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 Jeep 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 Jeep - Lost Engine Message - AutoCodes.com — U1118 Jeep Code - Lost Engine Message

What does this mean?

What are the Possible Causes of the DTC U1118 Jeep?

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 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 U1118 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.

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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 Jeep Code

1. What does the OBDII code U1118 for Jeep mean?

The U1118 code for Jeep indicates a lost engine message communication error.

2. What are the common symptoms of the U1118 code in a Jeep?

Common symptoms of the U1118 code in a Jeep may include engine performance issues, rough idling, stalling, or the activation of the Check Engine Light.

3. What are the possible causes of the U1118 code in a Jeep?

The U1118 code in a Jeep can be triggered by issues such as faulty engine control module (ECM), wiring problems, loose connections, or a malfunctioning CAN (Controller Area Network) bus.

4. How do I diagnose the U1118 code in my Jeep?

Diagnosing the U1118 code in a Jeep typically involves using an OBDII scanner to retrieve the code, inspecting the wiring and connections related to engine communication modules, and conducting a thorough visual inspection for any visible issues.

5. Can I still drive my Jeep with the U1118 code present?

It is not recommended to drive your Jeep with the U1118 code active, as it can lead to potential engine performance issues or further damage if left unresolved.

6. How can I repair the U1118 code in my Jeep?

To repair the U1118 code in your Jeep, you may need to address any wiring issues, repair or replace faulty engine control modules, ensure proper connections, and clear the code using an OBDII scanner.

7. Can a DIY enthusiast fix the U1118 code in a Jeep?

While some basic troubleshooting steps can be performed by DIY enthusiasts, diagnosing and repairing the U1118 code in a Jeep may require advanced knowledge and specialized tools, so it's best to consult a professional mechanic for assistance.

8. Is the U1118 code specific to Jeep vehicles only?

The U1118 code is not specific to Jeep vehicles and can be found in other makes and models as well, indicating a similar lost engine message communication error.

9. How much does it cost to fix the U1118 code in a Jeep?

The cost to fix the U1118 code in a Jeep can vary depending on the underlying cause of the issue, the extent of repairs needed, and labor costs. It's advisable to obtain quotes from reputable mechanics for an accurate estimate.

10. How can I prevent the U1118 code from reoccurring in my Jeep?

To prevent the U1118 code from reoccurring in your Jeep, regular maintenance checks, ensuring proper wiring connections, and addressing any issues promptly can help maintain the health of your vehicle's engine communication system.