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Engine-Codes – GMC – U1017 GMC

U1017 GMC Code - Lost Communication With Engine Control Module

Quick Answer

The U1017 GMC code indicates that there is a communication problem between the vehicle's onboard computer system, known as the Engine Control Module (ECM), and another module or sensor in the vehicle. Common causes include Damaged or corroded wiring or connectors, Faulty Engine Control Module (ECM), Malfunctioning module or sensor. 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 Damaged or corroded wiring or connectors, Faulty Engine Control Module (ECM), Malfunctioning module or sensor.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 17, 2024
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Code U1017 GMC Description

The U1017 GMC code indicates that there is a communication problem between the vehicle's onboard computer system, known as the Engine Control Module (ECM), and another module or sensor in the vehicle. The ECM is responsible for controlling various engine functions, such as fuel injection, ignition timing, and emissions systems. When communication is lost with the ECM, it can lead to a variety of issues that affect the vehicle's performance and drivability.

OBDII Code U1017 GMC - Lost Communication With Engine Control Module
U1017 GMC Code - Lost Communication With Engine Control Module

Common Causes of U1017 GMC

  1. Damaged or corroded wiring or connectors
  2. Faulty Engine Control Module (ECM)
  3. Malfunctioning module or sensor
  4. Software glitch in the vehicle's computer system
  5. Electrical interference or poor ground connections

Symptoms of U1017 GMC

  1. Check Engine Light illuminated on the dashboard
  2. Rough idling or stalling
  3. Hesitation or lack of power during acceleration
  4. Poor fuel economy
  5. Vehicle not starting

How to Fix U1017 GMC

  1. Perform a thorough inspection of the wiring and connectors for any damage or corrosion. Repair or replace as necessary.
  2. Use a diagnostic scan tool to communicate with the ECM and other modules to identify the source of the communication error.
  3. Test the ECM for proper function and replace if found to be faulty.
  4. Check and test other modules or sensors for malfunctions and replace as needed.
  5. Clear the diagnostic trouble codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix U1017 GMC

The cost of repairing a U1017 GMC code can vary depending on the specific cause of the communication error. In general, the cost of parts such as wiring, connectors, modules, or sensors can range from $100 to $500 or more. Labor costs at auto repair shops typically range from $80 to $150 per hour. The total cost of repairs for this issue could range from $200 to $1000 or more, depending on the extent of the problem and the necessary repairs. It is advisable to consult with a qualified mechanic or technician to obtain a more accurate estimate based on the specific circumstances of the vehicle.

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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.

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