AutoCodes – Generic – U184F

U184F 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 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 568

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

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?

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 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.

Need more information about the U184F code?

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Need Help with the Code?

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Information for Specific Makes

U184F Buick — Electric A/C Compressor Control Module Lost CommunicationWwith Engine Control Module
U184F Cadillac — Electric A/C Compressor Control Module Lost CommunicationWwith Engine Control Module
U184F Chevrolet — Electric A/C Compressor Control Module Lost CommunicationWwith Engine Control Module
U184F GMC — Electric A/C Compressor Control Module Lost CommunicationWwith Engine Control Module

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 Code

1. What does the OBDII code U184F mean?

The U184F code indicates a loss of communication between the Electric A/C Compressor Control Module and the Engine Control Module (ECM), which may affect the operation of the air conditioning system.

2. What are the symptoms of code U184F?

Common symptoms include the A/C not cooling properly, a check engine light or service A/C warning, and possibly reduced vehicle performance if the issue impacts overall system communication.

3. What causes the U184F code to appear?

This code is typically caused by faulty wiring or connectors, a failed A/C compressor control module, software glitches, or issues within the ECM.

4. Can I drive with the U184F code active?

While the vehicle may still be drivable, you may experience discomfort due to A/C malfunction, and ignoring the issue could lead to further communication or electrical problems.

5. How is the U184F code diagnosed?

A technician will use a scan tool to check for related codes, inspect wiring and connectors for damage, and test the communication signals between the A/C compressor and ECM.

6. How can I fix the U184F code?

Repairs may involve cleaning or repairing damaged connectors, replacing faulty wiring, updating software, or replacing the A/C compressor control module if necessary.

7. Is the U184F code specific to certain vehicle brands?

This code can appear in various makes and models, but it is often associated with vehicles that use advanced electronic A/C compressor systems.

8. Will clearing the code fix the problem?

Clearing the code may temporarily turn off the check engine light, but the underlying issue must be addressed to prevent the code from returning.

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

Repair costs can vary widely depending on the root cause, ranging from $50 for simple wiring repairs to $1,000 or more for module replacement and reprogramming.

10. Can the U184F code be caused by a dead battery?

Yes, a dead or weak battery can sometimes disrupt communication between modules and trigger this code, though itâ€™s not the most common cause.