AutoCodes – Chevrolet – U1152 Chevrolet

U1152 Chevrolet 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 Chevrolet 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 8,218

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

What does this mean?

What are the Possible Causes of the DTC U1152 Chevrolet?

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 Chevrolet?

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 Chevrolet 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 U1152 Chevrolet code?

Need more information on how to fix the U1152 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1152 Chevrolet 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 U1152 Chevrolet Code

1. What are the common symptoms of OBDII code U1152 (Lost Communications With HVAC Control Module) in a Chevrolet vehicle?

- Common symptoms include issues with the heating, ventilation, and air conditioning system, such as the HVAC controls not responding or the system not functioning properly.

2. What are some possible causes of OBDII code U1152 in a Chevrolet related to lost communications with the HVAC control module?

- Possible causes include a faulty HVAC control module, poor electrical connections, damaged wiring, or a malfunctioning communication network within the vehicle.

3. How can I diagnose the OBDII code U1152 in a Chevrolet indicating lost communications with the HVAC control module?

- Diagnosing this code may involve using a scan tool to communicate with the HVAC control module, checking for any stored trouble codes, and inspecting the wiring and connections for any visible damage.

4. Can a DIY enthusiast repair OBDII code U1152 in a Chevrolet caused by lost communications with the HVAC control module?

- While some simple repairs like checking and securing connections or replacing damaged wiring may be possible for a DIY enthusiast, diagnosing and repairing issues related to the HVAC control module itself may require professional assistance.

5. What are some tips for repairing OBDII code U1152 in a Chevrolet associated with lost communications with the HVAC control module?

- Tips include ensuring all electrical connections related to the HVAC control module are secure, checking for any corrosion or damage to wiring, and consulting a repair manual or professional technician for specific guidance.

6. Is it safe to continue driving a Chevrolet with OBDII code U1152 due to lost communications with the HVAC control module?

- While the vehicle may still be operable with this code present, it is recommended to address the issue promptly to prevent further damage to the HVAC system and ensure optimal functionality.

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

- Repair costs can vary depending on the underlying cause of the issue, but they may range from a few hundred to over a thousand dollars, especially if parts need to be replaced or reprogramming is required.

8. Can weather conditions or environmental factors contribute to the occurrence of OBDII code U1152 in a Chevrolet involving lost communications with the HVAC control module?

- Extreme temperatures, moisture, or exposure to harsh environmental conditions can potentially affect the HVAC control module's operation and communication, leading to the triggering of this code.

9. Are there any recalls or technical service bulletins (TSBs) related to OBDII code U1152 in Chevrolet vehicles regarding lost communications with the HVAC control module?

- It is advisable to check with Chevrolet dealerships or online databases for any relevant recalls or TSBs addressing issues with the HVAC control module communication to see if there are known solutions or repair procedures available.

10. How can I prevent OBDII code U1152 from occurring in the future in my Chevrolet due to lost communications with the HVAC control module?

- Regular maintenance, such as checking electrical connections, keeping the HVAC system clean, and addressing any issues promptly, can help prevent the recurrence of this code related to lost communications with the HVAC control module.

1. What are the common symptoms of OBDII code U1152 (Lost Communications With HVAC Control Module) in a Chevrolet?

- Common symptoms include intermittent or complete loss of HVAC system functionality, such as the inability to control temperature, fan speed, or air distribution.

2. What are the typical causes of the U1152 code in a Chevrolet related to the HVAC control module?

- The U1152 code is often caused by a faulty HVAC control module, damaged wiring or connectors, or a communication error within the vehicle's network.

3. How can I diagnose the U1152 code in my Chevrolet when the HVAC control module is involved?

- Diagnosing the U1152 code involves checking the HVAC control module for power and ground, inspecting wiring for damage or corrosion, and using a scan tool to verify communication with the module.

4. Are there any repair tips for addressing the U1152 code in a Chevrolet due to lost communications with the HVAC control module?

- Repair tips include ensuring all fuses related to the HVAC system are intact, checking for loose or damaged wiring connections, and potentially replacing the HVAC control module if necessary.

5. Can a DIY enthusiast fix the U1152 code caused by lost communications with the HVAC control module in a Chevrolet?

- DIY enthusiasts with automotive repair experience may be able to address the U1152 code by following service manuals, utilizing diagnostic tools, and carefully inspecting and repairing wiring connections.

6. How serious is the U1152 OBDII code related to the HVAC control module in a Chevrolet?

- While the U1152 code may not affect the overall drivability of the vehicle, it can impact the comfort and functionality of the HVAC system. It is recommended to address the issue promptly to restore proper operation.

7. Is it safe to continue driving with the U1152 code triggered by lost communications with the HVAC control module in a Chevrolet?

- It is generally safe to drive with the U1152 code, but it may result in discomfort due to the lack of proper HVAC system control. It is advisable to address the issue at the earliest convenience.

8. How much does it typically cost to repair the U1152 code caused by lost communications with the HVAC control module in a Chevrolet?

- Repair costs for the U1152 code can vary depending on the underlying cause. Costs may include diagnostic fees, replacement parts, and labor charges, with estimates ranging from $100 to $500 or more.

9. Can weather conditions or environmental factors trigger the U1152 code related to the HVAC control module in a Chevrolet?

- Extreme temperatures, moisture, or exposure to environmental elements can potentially contribute to wiring corrosion or damage, leading to the U1152 code due to lost communications with the HVAC control module.

10. Is it possible for the U1152 code to reoccur after repair in a Chevrolet experiencing lost communications with the HVAC control module?

- If the root cause of the U1152 code is not properly addressed during repair, it is possible for the code to reoccur. Thorough diagnosis and effective repair procedures can help prevent the issue from returning.