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Engine-Codes – GMC – U184C 2017 GMC Sierra

U184C 2017 GMC Sierra Code - Lost Communication with Instrument Cluster on Low Speed CAN Bus

Quick Answer

The U184C diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates that there is a communication error between the Engine Control Module (ECM) and the Instrument Cluster on the Low Speed Controller Area Network (CAN) Bus. Common causes include Loose or corroded wiring/connectors in the CAN Bus network, Faulty Instrument Cluster, Defective ECM. 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
U184C 2017 GMC Sierra indicates Lost Communication with Instrument Cluster on Low Speed CAN Bus.
Common causes
Common causes include Loose or corroded wiring/connectors in the CAN Bus network, Faulty Instrument Cluster, Defective ECM.
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 12, 2024
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Code U184C 2017 GMC Sierra Description

The U184C diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates that there is a communication error between the Engine Control Module (ECM) and the Instrument Cluster on the Low Speed Controller Area Network (CAN) Bus. The CAN Bus is a communication network that allows various modules in the vehicle to communicate with each other. When the ECM is unable to communicate with the Instrument Cluster on the Low Speed CAN Bus, it can lead to issues with displaying critical information to the driver, such as speed, fuel level, and warning lights.

OBDII Code U184C 2017 GMC Sierra - Lost Communication with Instrument Cluster on Low Speed CAN Bus
U184C 2017 GMC Sierra Code - Lost Communication with Instrument Cluster on Low Speed CAN Bus

Common Causes of U184C 2017 GMC Sierra

  1. Loose or corroded wiring/connectors in the CAN Bus network
  2. Faulty Instrument Cluster
  3. Defective ECM
  4. Software issues in the ECM or Instrument Cluster
  5. Physical damage to the CAN Bus network

Symptoms of U184C 2017 GMC Sierra

  1. Inaccurate or erratic gauge readings on the instrument cluster
  2. Warning lights flickering or not illuminating when necessary
  3. Loss of communication with other modules in the vehicle
  4. Difficulty starting the vehicle
  5. Drivability issues such as rough idling or stalling

How to Fix U184C 2017 GMC Sierra

  1. Perform a visual inspection of the wiring and connectors in the CAN Bus network to check for any signs of damage or corrosion.
  2. Use a diagnostic scan tool to communicate with the ECM and Instrument Cluster to identify the root cause of the communication error.
  3. Test the Instrument Cluster and ECM for proper functionality and replace any components that are found to be faulty.
  4. Clear the DTC and perform a test drive to ensure that the communication issue has been resolved.
  5. If the problem persists, further troubleshooting may be required, such as checking for software updates or conducting more in-depth electrical diagnostics.

Cost to Fix U184C 2017 GMC Sierra

The typical repair costs for addressing a U184C code on a 2017 GMC Sierra can vary depending on the specific cause of the communication error. In general, you can expect to pay anywhere from $200 to $500 for parts and labor. However, it is essential to note that the actual cost may be higher or lower based on factors such as the location of the repair shop, the expertise of the technicians, and the availability of replacement parts. Diagnostic time and labor rates at auto repair shops can range from $80 to $150 per hour, so it's advisable to contact local shops 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 U184C 2017 GMC Sierra Code

1. What does the OBDII code U184C on a 2017 GMC Sierra mean?

The U184C code indicates a communication error with the instrument cluster on the low-speed CAN bus in your GMC Sierra.

2. What are some common symptoms of the U184C code in a 2017 GMC Sierra?

Common symptoms may include the instrument cluster not working properly, warning lights coming on, or gauges not functioning correctly.

3. What are some possible causes of the U184C code in a 2017 GMC Sierra?

Potential causes of the U184C code include loose or damaged wiring, a faulty instrument cluster module, or a problem with the CAN bus communication network.

4. How can I diagnose the U184C code in my 2017 GMC Sierra?

Diagnosis typically involves checking the wiring connections to the instrument cluster, inspecting for any visible damage, and using a diagnostic tool to scan the vehicle's computer for trouble codes.

5. Can I still drive my 2017 GMC Sierra with the U184C code?

It is not recommended to drive your vehicle with the U184C code present, as it can affect the proper functioning of critical systems like the instrument cluster and may lead to further issues.

6. How can I repair the U184C code in my 2017 GMC Sierra?

Repairing the U184C code may involve fixing any damaged wiring, replacing the instrument cluster module if necessary, or addressing any communication network issues with the help of a professional mechanic.

7. Is the U184C code a serious issue in a 2017 GMC Sierra?

While the U184C code itself may not be a serious issue, it can lead to other problems if left unaddressed, so it's important to diagnose and repair the underlying cause promptly.

8. Can I reset the U184C code in my 2017 GMC Sierra myself?

You can attempt to clear the code with an OBDII scanner, but it's important to first diagnose and address the root cause of the issue to prevent the code from reoccurring.

9. How much does it cost to fix the U184C code in a 2017 GMC Sierra?

The cost of fixing the U184C code can vary depending on the underlying cause and the specific repairs needed, so it's best to consult with a mechanic for an accurate estimate.

10. Will the U184C code cause my 2017 GMC Sierra to fail an emissions test?

The U184C code may cause your GMC Sierra to fail an emissions test, as it indicates a problem with the vehicle's communication system that can impact emissions-related functions. It's advisable to address the issue before undergoing an emissions test.

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