U184A 2017 GMC Sierra Code - Lost Communication with Body Control Module on Low Speed CAN Bus
Quick Answer
The U184A diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates that there has been a communication failure between the Engine Control Module (ECM) and the Body Control Module (BCM) on the Low Speed Controller Area Network (CAN) Bus. Common causes include Faulty wiring or connectors in the Low Speed CAN Bus, Malfunctioning ECM or BCM, Software glitches in the ECM or BCM. 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
- U184A 2017 GMC Sierra indicates Lost Communication with Body Control Module on Low Speed CAN Bus.
- Common causes
- Common causes include Faulty wiring or connectors in the Low Speed CAN Bus, Malfunctioning ECM or BCM, Software glitches in the ECM or BCM.
- 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 U184A 2017 GMC Sierra Description
The U184A diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates that there has been a communication failure between the Engine Control Module (ECM) and the Body Control Module (BCM) on the Low Speed Controller Area Network (CAN) Bus. The Body Control Module is responsible for managing various functions related to the vehicle's body systems, such as lighting, power windows, and central locking. The loss of communication between the ECM and BCM can lead to a range of issues affecting the vehicle's performance and functionality.
Common Causes of U184A 2017 GMC Sierra
- Faulty wiring or connectors in the Low Speed CAN Bus.
- Malfunctioning ECM or BCM.
- Software glitches in the ECM or BCM.
- Corrosion or water damage in the wiring.
- Electrical short circuits.
Symptoms of U184A 2017 GMC Sierra
- Inoperative power windows or door locks.
- Interior or exterior lighting issues.
- Alarm system malfunctions.
- Vehicle going into "limp mode."
- Dashboard warning lights related to body systems.
How to Fix U184A 2017 GMC Sierra
- Perform a diagnostic scan to retrieve the fault codes and pinpoint the exact cause of the communication failure.
- Inspect the wiring harness and connectors for any signs of damage, corrosion, or loose connections.
- Test the ECM and BCM for proper functionality and address any malfunctions.
- Update the software in the ECM and BCM if necessary.
- Clear the DTCs and perform a road test to ensure the issue has been resolved.
Cost to Fix U184A 2017 GMC Sierra
The cost of repairing the U184A code on a 2017 GMC Sierra can vary depending on the specific cause of the communication failure. In general, the repair costs for this issue can range from $200 to $500, including parts and labor. However, it is essential to note that labor rates at auto repair shops can vary significantly, with hourly rates typically ranging from $80 to $150. Additionally, the cost of parts and diagnostic time may also contribute to the overall repair bill. It is advisable to consult with a local auto repair shop to obtain a more precise estimate based on the specific circumstances of the vehicle.
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Frequently Asked Questions about U184A 2017 GMC Sierra Code
What does the OBDII code U184A mean for a 2017 GMC Sierra?
The code U184A indicates a loss of communication with the Body Control Module (BCM) on the Low-Speed CAN Bus, typically due to a communication failure or network issue.
What are common symptoms of the U184A code in a 2017 GMC Sierra?
Symptoms may include malfunctioning interior electronics, such as power windows or door locks, dashboard warning lights, or issues with the vehicle’s lighting system.
What causes the U184A code to appear?
Common causes include a faulty BCM, damaged or corroded wiring, loose or broken connectors, or issues with the Low-Speed CAN Bus network.
Can a weak battery cause the U184A code in a 2017 GMC Sierra?
Yes, a weak or failing battery can cause communication issues, leading to the U184A code. Ensuring proper battery voltage is critical.
How do I diagnose the U184A code?
Start by inspecting the wiring and connectors related to the BCM and Low-Speed CAN Bus. Use a diagnostic scanner to verify communication between modules and check for additional codes.
Can I drive my 2017 GMC Sierra with the U184A code active?
While the vehicle may still be drivable, issues with the BCM could affect safety-related systems like lighting or door locks, so it’s best to address the problem promptly.
How do I fix the U184A code on my GMC Sierra?
Repairs may involve replacing damaged wiring, cleaning corroded connectors, reprogramming the BCM, or replacing the BCM if it’s faulty.
Does the U184A code always require BCM replacement?
No, BCM replacement is only necessary if the module is confirmed to be defective. Often, wiring or connection issues are the root cause.
How much does it cost to repair the U184A code on a 2017 GMC Sierra?
Repair costs vary depending on the issue. Diagnosing and fixing wiring or connectors may cost $100-$300, while replacing the BCM could exceed $500, including parts and labor.
Can a software update resolve the U184A code?
In some cases, a software update for the BCM or related modules may resolve communication issues, but this depends on the specific circumstances of the fault.
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