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U1817 2016 Chevrolet Silverado Code - Lost Communication with Hybrid Powertrain Control Module on Powertrain Expansion CAN Bus Malfunction

Quick Answer

The U1817 diagnostic trouble code (DTC) for a 2016 Chevrolet Silverado indicates a communication issue between the vehicle's onboard computer systems. Common causes include Corroded or damaged wiring, Loose or faulty connectors, Malfunctioning Hybrid Powertrain Control Module (HPCM). 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
U1817 2016 Chevrolet Silverado indicates Lost Communication with Hybrid Powertrain Control Module on Powertrain Expansion CAN Bus Malfunction.
Common causes
Common causes include Corroded or damaged wiring, Loose or faulty connectors, Malfunctioning Hybrid Powertrain Control Module (HPCM).
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 16, 2024
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Code U1817 2016 Chevrolet Silverado Description

The U1817 diagnostic trouble code (DTC) for a 2016 Chevrolet Silverado indicates a communication issue between the vehicle's onboard computer systems. Specifically, it signifies a loss of communication with the Hybrid Powertrain Control Module (HPCM) on the Powertrain Expansion Controller Area Network (CAN) Bus. The Powertrain Expansion CAN Bus is a network that allows various control modules within the vehicle to communicate with each other, sharing vital information for proper operation.

OBDII Code U1817 2016 Chevrolet Silverado - Lost Communication with Hybrid Powertrain Control Module on Powertrain Expansion CAN Bus Malfunction
U1817 2016 Chevrolet Silverado Code - Lost Communication with Hybrid Powertrain Control Module on Powertrain Expansion CAN Bus Malfunction

Common Causes of U1817 2016 Chevrolet Silverado

  1. Corroded or damaged wiring
  2. Loose or faulty connectors
  3. Malfunctioning Hybrid Powertrain Control Module (HPCM)
  4. Software glitches in the control modules
  5. Electrical interference or noise on the CAN Bus network

Symptoms of U1817 2016 Chevrolet Silverado

  1. Reduced fuel efficiency
  2. Erratic transmission shifting
  3. Loss of power
  4. Stalling
  5. Warning lights illuminated on the dashboard

How to Fix U1817 2016 Chevrolet Silverado

  1. Perform a thorough inspection of the wiring harness and connectors associated with the Powertrain Expansion CAN Bus.
  2. Check for any signs of corrosion, damage, or loose connections and repair or replace as necessary.
  3. Use a diagnostic scan tool to communicate with the Hybrid Powertrain Control Module and identify any specific communication faults.
  4. Clear the DTC and reset the system to see if the issue persists.
  5. If the problem persists, consider replacing the Hybrid Powertrain Control Module or seeking further assistance from a professional technician.

Cost to Fix U1817 2016 Chevrolet Silverado

The typical repair costs for addressing a U1817 code on a 2016 Chevrolet Silverado can vary depending on the specific cause of the issue. In general, parts and labor for diagnosing and repairing communication faults within the vehicle's control modules can range from $200 to $500. However, it's important to note that the actual cost may be higher if components need to be replaced or if additional diagnostic work is required. Additionally, labor rates at auto repair shops can vary, so it's advisable to check with local providers for a more accurate estimate.

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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 U1817 2016 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code U1817 on a 2016 Chevrolet Silverado?

- Common symptoms include the Check Engine light coming on, loss of communication with the hybrid powertrain control module, and potential drivability issues.

2. What does the U1817 code "Lost Communication with Hybrid Powertrain Control Module on Powertrain Expansion CAN Bus Malfunction" mean?

- This code indicates a communication problem between the vehicle's powertrain control module and the hybrid powertrain control module on the Powertrain Expansion CAN Bus.

3. What are some possible causes of the U1817 code on a 2016 Chevrolet Silverado?

- Possible causes include wiring issues, faulty connectors, a malfunctioning hybrid powertrain control module, or problems with the Powertrain Expansion CAN Bus.

4. How can I diagnose the U1817 code on my Chevrolet Silverado?

- Diagnosing this code typically involves inspecting the wiring and connectors, checking for loose connections, and using a diagnostic scanner to communicate with the control modules.

5. Is it safe to continue driving with the U1817 code present?

- It is not recommended to continue driving with the U1817 code active, as it may lead to drivability issues or potential damage to the vehicle's powertrain components.

6. Can I repair the U1817 code on my own?

- While some DIY enthusiasts may attempt to diagnose and repair this code, it is recommended to seek professional assistance due to the complexity of the hybrid powertrain system.

7. How much does it typically cost to repair the U1817 code on a 2016 Chevrolet Silverado?

- The cost of repairing the U1817 code can vary depending on the root cause of the issue, but it may involve labor costs for diagnosis and potential replacement of components.

8. Will resetting the trouble codes make the U1817 code disappear?

- Resetting the trouble codes may temporarily clear the Check Engine light, but if the underlying issue causing the U1817 code is not addressed, it is likely to reappear.

9. Can extreme weather conditions affect the occurrence of the U1817 code?

- Extreme weather conditions, especially temperature fluctuations, can potentially impact the electrical connections and components associated with the hybrid powertrain system, leading to the U1817 code.

10. How can I prevent the U1817 code from recurring in the future?

- Regular maintenance checks, ensuring proper wiring connections, and addressing any underlying electrical issues promptly can help prevent the U1817 code from recurring.

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