AutoCodes – Generic – U152A

U152A Code - HVAC Control Module Lost Communication With Left Upper Auxiliary Air Temperature Door Actuator On LIN Bus

Quick Answer

The Local Interconnect Network (LIN) Bus consists of a single wire with a transmission rate of 10.417 Kbit/s. Common causes include Faulty Left Upper Auxiliary Air Temperature Door Actuator, Left Upper Auxiliary Air Temperature Door Actuator harness is open or shorted, Left Upper Auxiliary Air Temperature Door Actuator 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: U152A indicates HVAC Control Module Lost Communication With Left Upper Auxiliary Air Temperature Door Actuator On LIN Bus.
Common causes: Common causes include Faulty Left Upper Auxiliary Air Temperature Door Actuator, Left Upper Auxiliary Air Temperature Door Actuator harness is open or shorted, Left Upper Auxiliary Air Temperature Door Actuator 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 1,245

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 Jun 03, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U152A Description

The Local Interconnect Network (LIN) Bus consists of a single wire with a transmission rate of 10.417 Kbit/s. The serial data is transmitted over a LIN circuit between a master control module and other LIN devices within a particular subsystem. If serial data communication is lost between any of the LIN devices on the LIN bus network, the master control module will set a no communication code against the non-communicating LIN device. The Diagnostic Trouble Code (DTC) will set when a supervised periodic message to the Heating, Ventilation, and Air Conditioning (HVAC) Control Module from the xxx has not been received.

OBDII Code U152A - HVAC Control Module Lost Communication With Left Upper Auxiliary Air Temperature Door Actuator On LIN Bus - AutoCodes.com — U152A Code - HVAC Control Module Lost Communication With Left Upper Auxiliary Air Temperature Door Actuator On LIN Bus

What does this mean?

What are the Possible Causes of the DTC U152A?

Faulty Left Upper Auxiliary Air Temperature Door Actuator
Left Upper Auxiliary Air Temperature Door Actuator harness is open or shorted
Left Upper Auxiliary Air Temperature Door Actuator circuit poor electrical connection
Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module

How to Fix the DTC U152A?

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 U152A 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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Information for Specific Makes

U152A Buick — HVAC Control Module Lost Communication With Left Upper Auxiliary Air Temperature Door Actuator On LIN Bus
U152A Cadillac — HVAC Control Module Lost Communication With Left Upper Auxiliary Air Temperature Door Actuator On LIN Bus
U152A Chevrolet — HVAC Control Module Lost Communication With Left Upper Auxiliary Air Temperature Door Actuator On LIN Bus
U152A GMC — HVAC Control Module Lost Communication With Left Upper Auxiliary Air Temperature Door Actuator On LIN Bus

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 U152A Code

1. What are common symptoms of OBDII code U152A?

- Common symptoms include issues with the heating and cooling system not working properly, inconsistent temperature control, and the inability to adjust the air temperature on the left side of the vehicle.

2. What does the OBDII code U152A indicate?

- The code U152A indicates that there is a communication problem between the HVAC control module and the left upper auxiliary air temperature door actuator on the LIN bus.

3. What are possible causes of the HVAC control module losing communication with the left upper auxiliary air temperature door actuator?

- Possible causes include a faulty HVAC control module, a malfunctioning left upper auxiliary air temperature door actuator, wiring issues, or a communication network problem on the LIN bus.

4. How can I diagnose the issue related to OBDII code U152A?

- Diagnosing the issue may involve checking for any visible wiring damage, testing the HVAC control module and the left upper auxiliary air temperature door actuator, and using a diagnostic scan tool to communicate with the affected components.

5. Can I continue driving with the OBDII code U152A present?

- It is generally not recommended to continue driving with the U152A code present, as it can lead to further HVAC system malfunctions and discomfort while driving.

6. How can I repair the HVAC control module lost communication issue?

- Repairing the issue may involve repairing or replacing any damaged wiring, replacing the faulty HVAC control module or left upper auxiliary air temperature door actuator, and ensuring proper communication on the LIN bus network.

7. Is it possible to reset the OBDII code U152A without fixing the underlying issue?

- While clearing the code may temporarily remove the warning light, the underlying issue causing the U152A code will still persist until properly diagnosed and repaired.

8. Can weather conditions affect the occurrence of OBDII code U152A?

- Extreme temperatures or humidity levels can potentially exacerbate communication issues between the HVAC control module and the left upper auxiliary air temperature door actuator, leading to the U152A code being triggered.

9. How long does it typically take to repair the HVAC control module lost communication issue?

- The repair time can vary depending on the exact cause of the communication problem, but it may take a few hours to a full day to diagnose, repair, and test the components related to the U152A code.

10. Are there any preventive maintenance steps to avoid encountering OBDII code U152A in the future?

- Regularly inspecting the HVAC system components, checking for any signs of wiring damage, and addressing communication issues promptly can help prevent the occurrence of the U152A code in the future.