AutoCodes – Cadillac – U1017 Cadillac

U1017 Cadillac Code - Lost Communication With Engine Control Module

Quick Answer

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Common causes include Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted, Engine 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: U1017 Cadillac indicates Lost Communication With Engine Control Module.
Common causes: Common causes include Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted, Engine 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 850

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Apr 24, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1017 Cadillac Description

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. When a module receives a message for a critical operating parameter, the module records the identification number of the module which sent the message for the state of health monitoring/node alive messages. A critical operating parameter is one which, when not received, requires that the module use a default value for that parameter. Once an identification number is learned by a module, it will monitor for that module node alive message. Each module on the class 2 serial data circuit is required to send a Node Alive message every 2 seconds. When no message is detected from a learned identification number for 5 seconds, a Diagnostic Trouble Code (DTC) U1017 is set.

OBDII Code U1017 Cadillac - Lost Communication With Engine Control Module - AutoCodes.com — U1017 Cadillac Code - Lost Communication With Engine Control Module

What does this mean?

What are the Possible Causes of the DTC U1017 Cadillac?

Faulty Engine Control Module (ECM)
Engine Control Module harness is open or shorted
Engine Control Module circuit poor electrical connection

How to Fix the DTC U1017 Cadillac?

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 U1017 Cadillac 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 U1017 Cadillac Code

1. What does the OBDII code U1017 mean on a Cadillac?

The U1017 code indicates a loss of communication with the Engine Control Module (ECM), meaning the ECM is not transmitting or receiving data properly over the vehicle's communication network.

2. What are the common symptoms of the U1017 code in a Cadillac?

Symptoms may include the Check Engine Light being illuminated, engine stalling, poor performance, failure to start, or dashboard warning lights for other systems like ABS or traction control.

3. What are the most common causes of the U1017 code?

The U1017 code is often caused by a faulty ECM, a damaged wiring harness, loose or corroded electrical connections, or issues with the vehicle's communication network.

4. How can I diagnose the U1017 code on my Cadillac?

Diagnose the U1017 code by inspecting the wiring and connections to the ECM, checking for loose or corroded connectors, and using a diagnostic scanner to check for other related communication codes.

5. Can a weak battery cause the U1017 code to appear?

Yes, a weak or failing battery can cause communication issues within the vehicle's systems, potentially triggering the U1017 code.

6. Is it safe to drive my Cadillac with the U1017 code active?

Driving with the U1017 code can be risky, as it may lead to engine performance issues or sudden stalling. Itâ€™s best to address the issue promptly to avoid further complications.

7. How much does it typically cost to fix the U1017 code on a Cadillac?

Repair costs can vary widely, ranging from $100 to $1,000, depending on whether the issue is a simple wiring repair or a full ECM replacement.

8. Can a software update fix the U1017 code in a Cadillac?

In some cases, a software update for the ECM or other control modules may resolve the communication issue. Check with your dealership or mechanic for updates.

9. What tools are required to troubleshoot the U1017 code?

Youâ€™ll need an OBDII scanner capable of reading manufacturer-specific codes, a multimeter to test wiring and connections, and possibly a wiring diagram for your Cadillac.

10. How can I prevent the U1017 code from occurring again?

Regularly inspect and maintain the vehicleâ€™s electrical connections, ensure the battery is in good condition, and address any warning signs of electrical issues promptly.