AutoCodes – Buick – U1152 Buick

U1152 Buick 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 Buick 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 619

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

What does this mean?

What are the Possible Causes of the DTC U1152 Buick?

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 Buick?

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 Buick 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 Buick Code

1. What does the OBDII code U1152 mean on a Buick?

The U1152 code indicates a loss of communication with the HVAC control module, which can disrupt climate control functions.

2. What are the common symptoms of the U1152 code in a Buick?

Symptoms may include malfunctioning air conditioning or heating, unresponsive climate controls, or error messages on the dashboard.

3. What causes the U1152 code on a Buick?

Common causes include faulty wiring or connectors, a failing HVAC control module, or issues with the CAN bus communication network.

4. Can a weak battery cause the U1152 code in a Buick?

Yes, a weak or failing battery can disrupt electrical signals and may lead to communication errors like U1152.

5. How can I diagnose the U1152 code on my Buick?

Start by inspecting wiring and connectors for damage, check the battery voltage, and use a diagnostic scanner to confirm module communication issues.

6. Is it safe to drive my Buick with the U1152 code?

Yes, it is generally safe to drive, but HVAC controls may not function properly, which can be inconvenient in extreme temperatures.

7. How can I fix the U1152 code on a Buick?

Repairs may include fixing damaged wiring, replacing connectors, updating software, or replacing the HVAC control module if necessary.

8. Do I need to replace the HVAC control module to fix the U1152 code?

Not always; the issue might be with the wiring, connectors, or software. Replacing the module is only necessary if itâ€™s confirmed to be faulty.

9. Can the U1152 code be triggered by a software problem?

Yes, outdated or corrupted software in the control modules can sometimes cause communication errors like U1152.

10. How much does it cost to repair the U1152 code on a Buick?

Repair costs can range from $50 to $500 depending on whether the fix involves simple wiring repairs or replacing the HVAC control module.

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