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U1818 2017 Chevrolet Silverado Code - Lost Communication with Engine Control Module on Powertrain Expansion Communication Bus

Quick Answer

The U1818 diagnostic trouble code (DTC) for a 2017 Chevrolet Silverado indicates that there is a communication issue between the Engine Control Module (ECM) and the Powertrain Expansion Communication Bus. Common causes include Faulty wiring or connectors between the ECM and the Powertrain Expansion Communication Bus, Malfunctioning ECM, Issues with other modules on the communication bus. 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
U1818 2017 Chevrolet Silverado indicates Lost Communication with Engine Control Module on Powertrain Expansion Communication Bus.
Common causes
Common causes include Faulty wiring or connectors between the ECM and the Powertrain Expansion Communication Bus, Malfunctioning ECM, Issues with other modules on the communication bus.
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 U1818 2017 Chevrolet Silverado Description

The U1818 diagnostic trouble code (DTC) for a 2017 Chevrolet Silverado indicates that there is a communication issue between the Engine Control Module (ECM) and the Powertrain Expansion Communication Bus. The ECM is a crucial component of the vehicle's engine management system, responsible for controlling various engine functions such as fuel injection, ignition timing, and emissions control. The Powertrain Expansion Communication Bus is a network that allows different modules within the vehicle to communicate with each other.

OBDII Code U1818 2017 Chevrolet Silverado - Lost Communication with Engine Control Module on Powertrain Expansion Communication Bus
U1818 2017 Chevrolet Silverado Code - Lost Communication with Engine Control Module on Powertrain Expansion Communication Bus

Common Causes of U1818 2017 Chevrolet Silverado

  1. Faulty wiring or connectors between the ECM and the Powertrain Expansion Communication Bus
  2. Malfunctioning ECM
  3. Issues with other modules on the communication bus
  4. Software glitches within the vehicle's control modules
  5. Water or corrosion damage to the communication bus components

Symptoms of U1818 2017 Chevrolet Silverado

  1. Check engine light illuminated on the dashboard
  2. Engine running rough or misfiring
  3. Reduced fuel efficiency
  4. Engine stalling or hesitation during acceleration
  5. Inability to communicate with the ECM using a diagnostic scan tool

How to Fix U1818 2017 Chevrolet Silverado

  1. Begin by conducting a thorough inspection of the wiring and connectors between the ECM and the Powertrain Expansion Communication Bus. Repair or replace any damaged or corroded components.
  2. Use a diagnostic scan tool to attempt to communicate with the ECM and other modules on the communication bus. If communication is still not established, further diagnosis may be required.
  3. Check for any software updates or reprogramming that may be available for the ECM or other modules involved in the communication bus.
  4. If the issue persists, consider replacing the ECM or any other faulty modules on the communication bus that may be causing the communication breakdown.
  5. After completing the repair, clear the DTC and test drive the vehicle to ensure that the communication issue has been resolved.

Cost to Fix U1818 2017 Chevrolet Silverado

The typical repair costs for addressing a U1818 code on a 2017 Chevrolet Silverado can vary depending on the specific cause of the communication issue. In general, the cost of parts such as wiring, connectors, or modules can range from $100 to $500. Labor costs at auto repair shops typically range from $80 to $150 per hour, and the total repair bill could amount to $200 to $800 or more, depending on the extent of the repairs needed. It's recommended to consult with a qualified mechanic or dealership for a more accurate cost estimate based on the specific diagnosis and repair required for your 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 U1818 2017 Chevrolet Silverado Code

1. What are common symptoms of OBDII code U1818 on a 2017 Chevrolet Silverado?

- Common symptoms include engine performance issues, stalling, rough idling, and the illumination of the check engine light.

2. What does the OBDII code U1818 indicating "Lost Communication with Engine Control Module on Powertrain Expansion Communication Bus" mean?

- This code suggests a communication problem between the engine control module and other modules on the powertrain expansion communication bus.

3. What are some possible causes of OBDII code U1818 on a 2017 Chevrolet Silverado?

- Potential causes include faulty wiring or connectors, a malfunctioning engine control module, issues with the powertrain expansion communication bus, or a software glitch.

4. How can I diagnose the issue related to OBDII code U1818 on my 2017 Chevrolet Silverado?

- Diagnosing the problem typically involves checking the wiring and connectors for damage, ensuring proper connections, and using a diagnostic tool to scan for communication errors.

5. What are some tips for repairing OBDII code U1818 on a 2017 Chevrolet Silverado?

- Repair tips may include repairing or replacing damaged wiring, ensuring secure connections, resetting the engine control module, or updating software if necessary.

6. Can I continue driving my 2017 Chevrolet Silverado with the U1818 code present?

- It is not recommended to continue driving with this code present, as it may lead to further issues and potential damage to the vehicle's components.

7. How much does it typically cost to repair OBDII code U1818 on a 2017 Chevrolet Silverado?

- The cost of repair can vary depending on the underlying cause, but it may range from a simple wiring repair cost to a more expensive engine control module replacement.

8. Will resetting the check engine light resolve the U1818 code issue on my 2017 Chevrolet Silverado?

- Resetting the check engine light may temporarily remove the code, but it will not fix the underlying communication problem causing the U1818 code.

9. Are there any recalls or technical service bulletins related to OBDII code U1818 for the 2017 Chevrolet Silverado?

- It is advisable to check with a Chevrolet dealership or online resources to see if there are any relevant recalls or technical service bulletins related to this code for your specific vehicle.

10. Can a DIY enthusiast fix the U1818 code issue on a 2017 Chevrolet Silverado, or is it best left to professionals?

- While some basic troubleshooting steps can be performed by a DIY enthusiast, diagnosing and repairing communication issues like the U1818 code may require specialized tools and expertise best handled by a professional mechanic.

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