AutoCodes – Cadillac – U016B Cadillac

U016B Cadillac Code - Lost Communication With Electric A/C Compressor Control Module

Quick Answer

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Electric A/C Compressor Control Module, Electric A/C Compressor Control Module harness is open or shorted, Electric A/C Compressor 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: U016B Cadillac indicates Lost Communication With Electric A/C Compressor Control Module.
Common causes: Common causes include Faulty Electric A/C Compressor Control Module, Electric A/C Compressor Control Module harness is open or shorted, Electric A/C Compressor 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 510

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 Apr 02, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code U016B Cadillac Description

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Electric A/C Compressor Control Module has not been received.

OBDII Code U016B Cadillac - Lost Communication With Electric A/C Compressor Control Module - AutoCodes.com — U016B Cadillac Code - Lost Communication With Electric A/C Compressor Control Module

What does this mean?

What are the Possible Causes of the DTC U016B Cadillac?

Faulty Electric A/C Compressor Control Module
Electric A/C Compressor Control Module harness is open or shorted
Electric A/C Compressor Control Module circuit poor electrical connection

How to Fix the DTC U016B Cadillac?

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 U016B Cadillac 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 U016B Cadillac code?

Need more information on how to fix the U016B Cadillac code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U016B Cadillac code diagnosed by a professional: Find a repair shop in your area

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 U016B Cadillac Code

1. What are the common symptoms of OBDII code U016B in a Cadillac related to the Electric A/C Compressor Control Module?

- Common symptoms include loss of air conditioning functionality, lack of cool air from the vents, and potential issues with climate control settings.

2. What are the possible causes of the U016B code in a Cadillac indicating a lost communication with the Electric A/C Compressor Control Module?

- Causes can include a faulty A/C compressor control module, damaged wiring or connectors, software glitches, or issues with the vehicle's network communication system.

3. How can I diagnose the U016B code related to the Electric A/C Compressor Control Module in my Cadillac?

- Diagnosis typically involves using a professional OBDII scanner to retrieve the specific trouble codes, checking for any visible wiring damage, and performing network communication tests.

4. Is it safe to continue driving with the U016B code present in my Cadillac?

- It is generally not recommended to drive with the U016B code present, as it can lead to further A/C system issues and potentially affect the vehicle's overall performance.

5. Can I reset the U016B code in my Cadillac related to the Electric A/C Compressor Control Module on my own?

- While you can clear the code with an OBDII scanner, it is essential to address the underlying issue causing the communication loss to prevent the code from reappearing.

6. Are there any quick repair tips for fixing the U016B code in a Cadillac?

- Quick tips include checking and securing all wiring connections related to the A/C compressor control module, ensuring proper power supply, and performing a software reset if possible.

7. How much does it typically cost to repair the U016B code indicating a lost communication with the Electric A/C Compressor Control Module in a Cadillac?

- Repair costs can vary depending on the exact cause of the issue, but they may range from a few hundred to over a thousand dollars, including parts and labor.

8. Can a DIY enthusiast with automotive knowledge fix the U016B code issue in a Cadillac themselves?

- While some experienced DIY enthusiasts may be able to address simple wiring or connector issues, diagnosing and repairing complex network communication problems may require professional expertise.

9. How long does it usually take to repair the U016B code related to the Electric A/C Compressor Control Module in a Cadillac?

- The repair time can vary depending on the severity of the issue and the availability of parts. In general, it may take a few hours to a full day for a professional mechanic to diagnose and fix the problem.

10. Will fixing the U016B code in my Cadillac improve the overall performance and efficiency of the A/C system?

- Yes, resolving the communication issue with the Electric A/C Compressor Control Module can help restore proper A/C functionality, ensuring optimal performance and efficiency of the system.