AutoCodes – Pontiac – U1152 Pontiac

U1152 Pontiac 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 Pontiac 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 675

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

What does this mean?

What are the Possible Causes of the DTC U1152 Pontiac?

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 Pontiac?

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 Pontiac 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 Pontiac Code

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

- Common symptoms include malfunctioning HVAC controls, loss of communication with the heating and cooling system, and possible issues with temperature regulation.

2. What are the possible causes of OBDII code U1152 in a Pontiac?

- The code U1152 can be triggered by a faulty HVAC control module, wiring issues, a damaged communication network, or a malfunctioning PCM (powertrain control module).

3. How can I diagnose the OBDII code U1152 in my Pontiac?

- To diagnose code U1152, you will need a diagnostic scanner to retrieve the trouble codes, inspect the wiring connections to the HVAC control module, and check for any visible damage or corrosion.

4. Can a DIY enthusiast repair OBDII code U1152 in a Pontiac?

- Repairing code U1152 may require advanced automotive knowledge and specialized tools. It is recommended to consult a professional mechanic to accurately diagnose and repair the issue.

5. Is it safe to continue driving with the OBDII code U1152 in a Pontiac?

- It is not recommended to continue driving with code U1152, as it may affect the proper functioning of the HVAC system, leading to discomfort and potential safety hazards.

6. How much does it typically cost to repair OBDII code U1152 in a Pontiac?

- The cost of repairing code U1152 can vary depending on the root cause of the issue. It is advisable to get a diagnostic assessment from a qualified mechanic to determine the exact cost.

7. Can a faulty HVAC control module be repaired, or does it need to be replaced?

- In most cases, a faulty HVAC control module will need to be replaced rather than repaired. Replacement parts can be sourced from authorized dealers or aftermarket suppliers.

8. Are there any preventive maintenance steps to avoid OBDII code U1152 in a Pontiac?

- Regular vehicle maintenance, including checking the wiring connections and ensuring proper functioning of the HVAC system, can help prevent issues that may trigger code U1152.

9. How long does it typically take to repair OBDII code U1152 in a Pontiac?

- The repair time for code U1152 can vary depending on the complexity of the issue and availability of parts. It is recommended to consult with a mechanic for a more accurate estimate.

10. Can a software update fix the communication issue causing OBDII code U1152 in a Pontiac?

- In some cases, a software update or reprogramming of the PCM may resolve the communication issue triggering code U1152. Consult with a certified technician to explore this option.