AutoCodes – Generic – U1017

U1017 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 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 36,701

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 24, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1017 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 - Lost Communication With Engine Control Module - AutoCodes.com — U1017 Code - Lost Communication With Engine Control Module

What does this mean?

What are the Possible Causes of the DTC U1017?

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?

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 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 U1017 code?

Need more information on how to fix the U1017 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1017 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U1017 Buick — Lost Communication With Engine Control Module
U1017 Cadillac — Lost Communication With Engine Control Module
U1017 Chevrolet — Lost Communication With Engine Control Module
U1017 GMC — Lost Communication With Engine Control Module
U1017 Pontiac — Lost Communication With Engine Control Module

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 Code

1. What are the common symptoms of OBDII code U1017 - Lost Communication With Engine Control Module?

- Common symptoms include engine stalling, rough idle, difficulty starting the vehicle, and illuminated check engine light.

2. What are the possible causes of OBDII code U1017?

- The code U1017 can be triggered by issues such as a faulty Engine Control Module (ECM), damaged wiring or connectors, or a communication bus malfunction.

3. How can I diagnose the cause of OBDII code U1017?

- To diagnose the issue, you can perform a visual inspection of the wiring and connectors, test the ECM for functionality, and use a scan tool to check the communication between modules.

4. Can a bad battery or alternator cause OBDII code U1017?

- Yes, a weak or failing battery or alternator can sometimes cause communication errors between modules and trigger code U1017. It is recommended to check the condition of the battery and charging system.

5. Is it safe to continue driving with OBDII code U1017 present?

- It is not recommended to continue driving with code U1017 present, as it may lead to further damage to the engine control system and potentially affect the vehicle's performance and safety.

6. How can I clear OBDII code U1017 from my vehicle's system?

- You can clear the code using a scan tool that has the ability to reset fault codes. However, it is important to diagnose and address the underlying issue causing the code before clearing it.

7. Can I repair OBDII code U1017 myself, or should I seek professional help?

- The complexity of resolving code U1017 varies depending on the underlying cause. While some simple issues like loose connectors can be fixed by DIY enthusiasts, more complex problems may require professional assistance.

8. Are there any specific vehicles known to be prone to OBDII code U1017?

- While this code can occur in various vehicle makes and models, certain vehicles with known electrical system issues or communication bus problems may be more prone to experiencing code U1017.

9. Will resetting the ECM clear OBDII code U1017 permanently?

- Resetting the ECM may clear the code temporarily, but if the underlying issue causing the communication error is not addressed, the code is likely to reappear.

10. How much can I expect to pay for a repair related to OBDII code U1017?

- The cost of repairing code U1017 can vary widely depending on the cause of the issue, labor rates in your area, and whether new parts are needed. It is advisable to obtain quotes from multiple mechanics or repair shops for an accurate estimate.