AutoCodes – GMC – U1017 GMC

U1017 GMC 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 GMC 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 3,042

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

What does this mean?

What are the Possible Causes of the DTC U1017 GMC?

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 GMC?

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 GMC 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 GMC Code

1. What are common symptoms of OBDII code U1017 GMC?

- Common symptoms include engine stalling, rough idling, poor fuel efficiency, and issues with starting the vehicle.

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

- The code U1017 typically indicates a communication problem between the vehicle's onboard computer system and the engine control module. Possible causes include wiring issues, a faulty engine control module, or a poor connection.

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

- Diagnosing the code may require using a diagnostic scanner to read the trouble codes and checking the wiring connections between the modules. It may also involve testing the engine control module for faults.

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

- Yes, a weak battery or failing alternator can cause voltage fluctuations that may trigger communication errors between modules, leading to the U1017 code.

5. What are some repair tips for fixing OBDII code U1017 GMC?

- Start by checking and repairing any damaged wiring or loose connections. If the issue persists, consider replacing the engine control module after confirming it is faulty.

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

- It is not recommended to drive with the U1017 code present, as it can lead to further damage to the engine control module and potentially affect the vehicle's performance.

7. Can OBDII code U1017 GMC be reset without fixing the underlying issue?

- While you can clear the code with a diagnostic scanner, it will likely reappear if the root cause of the communication problem is not addressed.

8. How much does it cost to repair OBDII code U1017 GMC?

- The cost of repairing the U1017 code can vary depending on the underlying issue. Repair costs may include diagnostic fees, wiring repairs, or module replacements, which can range from a few hundred to over a thousand dollars.

9. Are there any recalls related to OBDII code U1017 GMC for specific vehicle models?

- It's essential to check with the manufacturer or a dealership to see if there are any recalls related to the U1017 code for your specific vehicle make and model.

10. Can a DIY enthusiast fix OBDII code U1017 GMC, or is it best left to professionals?

- DIY enthusiasts with the necessary tools and knowledge of automotive electrical systems may be able to diagnose and fix the U1017 code by checking wiring connections and replacing the engine control module. However, if in doubt, it's recommended to seek professional help.