AutoCodes – Cadillac – U1152 Cadillac

U1152 Cadillac Code - Lost Communications With HVAC Control Module

Quick Answer

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Common causes include Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module, HVAC Control Module harness is open or shorted, HVAC 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: U1152 Cadillac indicates Lost Communications With HVAC Control Module .
Common causes: Common causes include Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module, HVAC Control Module harness is open or shorted, HVAC 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 1,540

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 24, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1152 Cadillac Description

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. When a module receives a message for a critical operating parameter, the module records the identification number of the module which sent the message for the state of health monitoring/node alive messages. A critical operating parameter is one which, when not received, requires that the module use a default value for that parameter. Once an identification number is learned by a module, it will monitor for that module node alive message. Each module on the class 2 serial data circuit is required to send a Node Alive message every 2 seconds. When no message is detected from a learned identification number for 5 seconds, a Diagnostic Trouble Code (DTC) U1152 is set.

OBDII Code U1152 Cadillac - Lost Communications With HVAC Control Module - AutoCodes.com — U1152 Cadillac Code - Lost Communications With HVAC Control Module

What does this mean?

What are the Possible Causes of the DTC U1152 Cadillac?

Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module
HVAC Control Module harness is open or shorted
HVAC Control Module circuit poor electrical connection

How to Fix the DTC U1152 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 U1152 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.

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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 U1152 Cadillac Code

1. What are the common symptoms of OBDII code U1152 in a Cadillac related to lost communications with the HVAC control module?

- Common symptoms include issues with the air conditioning system, heater control problems, and malfunctioning climate control features.

2. What are the possible causes of OBDII code U1152 in a Cadillac indicating lost communications with the HVAC control module?

- Possible causes include a faulty HVAC control module, damaged wiring or connectors, a blown fuse, or issues with the vehicle's network communication system.

3. How can I diagnose OBDII code U1152 in a Cadillac related to lost communications with the HVAC control module?

- Diagnosis typically involves using a diagnostic scanner to retrieve the specific error code, checking the HVAC control module for power and ground, inspecting wiring for damage, and testing communication signals.

4. What are some repair tips for addressing OBDII code U1152 in a Cadillac indicating lost communications with the HVAC control module?

- Repair tips may include checking and repairing any damaged wiring, ensuring proper connections at the HVAC control module, resetting the system, or replacing the HVAC control module if necessary.

5. Is it safe to continue driving with OBDII code U1152 in a Cadillac related to lost communications with the HVAC control module?

- It is generally not recommended to continue driving with this code present, as it can affect the proper functioning of the HVAC system and lead to discomfort while driving.

6. Can a DIY enthusiast repair OBDII code U1152 in a Cadillac indicating lost communications with the HVAC control module?

- Depending on the specific cause of the issue, some DIY enthusiasts may be able to address simple wiring or connector problems, but more complex issues may require professional diagnosis and repair.

7. How much does it typically cost to repair OBDII code U1152 in a Cadillac due to lost communications with the HVAC control module?

- The cost of repair can vary widely depending on the specific cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

8. Will resetting the OBDII code U1152 in a Cadillac fix the issue of lost communications with the HVAC control module?

- While resetting the code may temporarily clear the error message, it will not address the underlying communication problem between the vehicle's systems.

9. Are there any preventive measures to avoid encountering OBDII code U1152 in a Cadillac related to lost communications with the HVAC control module?

- Regularly inspecting and maintaining the HVAC system, checking for any signs of wiring damage, and addressing any communication issues promptly can help prevent this code from appearing.

10. How long does it take to repair OBDII code U1152 in a Cadillac caused by lost communications with the HVAC control module?

- The repair time can vary depending on the exact cause of the issue and the complexity of the repair needed, but it may take anywhere from a few hours to a full day at a repair shop.