AutoCodes – Chevrolet – B0145 Chevrolet

B0145 Chevrolet Code - Auxiliary Mode Actuator

Quick Answer

The Auxiliary Heating, Ventilation, and Air Conditioning (HVAC) actuators are a 5-wire bi-directional electric motor that incorporates a feedback potentiometer. Common causes include Faulty Auxiliary Mode Actuator, Auxiliary Mode Actuator harness is open or shorted, Auxiliary Mode Actuator circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: B0145 Chevrolet indicates Auxiliary Mode Actuator.
Common causes: Common causes include Faulty Auxiliary Mode Actuator, Auxiliary Mode Actuator harness is open or shorted, Auxiliary Mode Actuator circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 4,752

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 10, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B0145 Chevrolet Description

The Auxiliary Heating, Ventilation, and Air Conditioning (HVAC) actuators are a 5-wire bi-directional electric motor that incorporates a feedback potentiometer. Low reference, 5-volt reference, position signal, and 2 control circuits enable the actuator to operate. The control circuits use either a 0 or 12 volt value to coordinate the actuator movement. When the actuator is at rest, both control circuits have a value of 0 volts. In order to move the actuator, the HVAC control module grounds one of the control circuits while providing the other with 12 volts. The auxiliary HVAC control module reverses the polarity of the control circuits to move the actuator in the opposite direction. When the actuator shaft rotates, the potentiometers adjustable contact changes the door position signal between 0-5 volts. This signal then is converted into a count value where as 1 volt will equal 51 counts.
The auxiliary HVAC control module calibrates the travel range of the HVAC door actuators when it is initially powered by the battery positive voltage circuit. During calibration, the module commands the actuators in each direction until door travel is stopped. The module stores the minimum door positions and the maximum door positions of each actuator into memory. The total travel range is calculated by subtracting the minimum door position from the maximum door position.

OBDII Code B0145 Chevrolet - Auxiliary Mode Actuator - AutoCodes.com — B0145 Chevrolet Code - Auxiliary Mode Actuator

What does this mean?

What are the Possible Causes of the DTC B0145 Chevrolet?

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

How to Fix the DTC B0145 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 B0145 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.

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Need Help with the Code?

Get the B0145 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 B0145 Chevrolet Code

1. What are common symptoms of OBDII code B0145 in a Chevrolet related to the Auxiliary Mode Actuator?

- Common symptoms include issues with the airflow direction control, inconsistent temperature regulation, or unusual noises coming from the HVAC system.

2. What typically causes OBDII code B0145 in a Chevrolet?

- The code B0145 is usually triggered by a malfunction in the Auxiliary Mode Actuator, which may be due to a faulty actuator motor, wiring issues, or a failed actuator assembly.

3. How can I diagnose the cause of OBDII code B0145 in my Chevrolet?

- You can diagnose the issue by checking the actuator motor for proper operation, inspecting the wiring for any damage or loose connections, and testing the actuator assembly for functionality.

4. Can I drive my Chevrolet with OBDII code B0145 present?

- It is not recommended to drive your Chevrolet with OBDII code B0145 present, as it can lead to discomfort while driving due to HVAC system malfunctions and may cause further damage if left unresolved.

5. Is it possible to reset OBDII code B0145 in a Chevrolet without fixing the issue?

- While you can clear the code temporarily, it will likely reappear until the underlying problem with the Auxiliary Mode Actuator is addressed.

6. Are there any DIY repair tips for fixing OBDII code B0145 in a Chevrolet?

- DIY repair tips may include checking and replacing any damaged wiring, ensuring proper connection of the actuator motor, and performing a recalibration of the HVAC system after replacing the actuator.

7. How much does it typically cost to repair OBDII code B0145 related to the Auxiliary Mode Actuator in a Chevrolet?

- Repair costs can vary depending on the extent of the issue and whether you choose to fix it yourself or take it to a professional, but it may range from $100 to $300 or more.

8. Can a faulty Auxiliary Mode Actuator impact the overall performance of my Chevrolet?

- Yes, a faulty Auxiliary Mode Actuator can impact the overall comfort and functionality of your Chevrolet's HVAC system, affecting the air distribution and temperature control inside the vehicle.

9. Is it necessary to replace the entire Auxiliary Mode Actuator assembly when dealing with OBDII code B0145?

- In some cases, replacing the entire actuator assembly may be necessary to ensure proper functioning of the HVAC system and prevent future issues related to the Auxiliary Mode Actuator.

10. How long does it take to repair OBDII code B0145 in a Chevrolet related to the Auxiliary Mode Actuator?

- The repair time can vary depending on the exact cause of the issue and your level of experience, but it may take anywhere from 1 to 3 hours to diagnose and fix the problem.