AutoCodes – GMC – U184F GMC

U184F GMC Code - Electric A/C Compressor Control Module Lost CommunicationWwith Engine Control Module

Quick Answer

The serial data circuit is the means by which the devices in the vehicle communicate with each other. Common causes include Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted, Engine Control Module circuit poor electrical connection. 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: U184F GMC indicates Electric A/C Compressor Control Module Lost CommunicationWwith Engine Control Module.
Common causes: Common causes include Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted, Engine Control Module circuit poor electrical connection.
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 Popularity 521

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U184F GMC Description

The serial data circuit is the means by which the devices in the vehicle communicate with each other. Once the scan tool is connected to the serial data circuit through the Data Link Connector (DLC), the scan tool can be used to monitor each device for diagnostic purposes and to check for Diagnostic Trouble Code (DTC). When the vehicle is ON, each device communicating on the serial data circuit sends a state of health message to ensure that the device is operating properly. When a device stops communicating on the serial data circuit, for example, if the device loses power or ground, the state of health message it normally sends on the serial data circuit disappears. Other devices on the serial data circuit, which expect to receive that state of the health message, detect its absence; those devices in turn set a DTC associated with the loss of the state of health of the non-communicating device. A loss of serial data communications DTC does not represent a failure of the devices that contain the stored DTC.
The DTC will set when a supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U184F GMC - Electric A/C Compressor Control Module Lost CommunicationWwith Engine Control Module - AutoCodes.com — U184F GMC Code - Electric A/C Compressor Control Module Lost CommunicationWwith Engine Control Module

What does this mean?

What are the Possible Causes of the DTC U184F GMC?

Faulty Engine Control Module (ECM)
Engine Control Module harness is open or shorted
Engine Control Module circuit poor electrical connection

How to Fix the DTC U184F GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U184F GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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 U184F GMC Code

1. What does the OBDII code U184F mean on a GMC vehicle?

The U184F code indicates a loss of communication between the Electric A/C Compressor Control Module and the Engine Control Module (ECM).

2. What are the common symptoms of the U184F code?

Symptoms can include reduced or no air conditioning performance, a check engine light, or communication-related fault codes stored in the system.

3. What causes the U184F code to appear on a GMC vehicle?

The code can be caused by issues such as a faulty A/C compressor control module, damaged wiring or connectors, or a malfunctioning ECM.

4. Can a blown fuse cause the U184F code?

Yes, a blown fuse related to the A/C system or control modules can interrupt communication and trigger the code.

5. How can I diagnose the U184F code on my GMC?

Use an OBDII scanner to confirm the code, inspect the wiring and connectors for damage or corrosion, and check for any related fuses or module faults.

6. Is it safe to drive with the U184F code?

Driving is generally safe, but the A/C system may not function properly, which can impact comfort and visibility if defrosting is needed.

7. How do I fix the U184F code on a GMC?

Repairs may include replacing the damaged wiring, repairing or replacing the A/C compressor control module, or reprogramming the ECM if needed.

8. Can software updates resolve the U184F code?

Yes, in some cases, an ECM or control module software update from the dealership can resolve communication issues.

9. How much does it cost to repair the U184F code?

Repair costs vary but can range from $100 for simple wiring fixes to $1,000 or more if the A/C compressor control module needs replacement.

10. Can a low battery cause the U184F code?

Yes, a weak or low battery can cause communication errors between control modules, potentially triggering the U184F code.

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