AutoCodes – Hummer – B0145 Hummer

B0145 Hummer 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 Hummer 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 2,829

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 Hummer 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 Hummer - Auxiliary Mode Actuator - AutoCodes.com — B0145 Hummer Code - Auxiliary Mode Actuator

What does this mean?

What are the Possible Causes of the DTC B0145 Hummer?

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 Hummer?

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 Hummer 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 B0145 Hummer Code

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

- Common symptoms include issues with the HVAC system, such as improper airflow distribution and inconsistent temperature control.

2. What could cause OBDII code B0145 related to the Auxiliary Mode Actuator in a Hummer?

- The code B0145 can be triggered by a faulty auxiliary mode actuator, a malfunctioning HVAC control module, or wiring issues.

3. How can I diagnose the OBDII code B0145 in my Hummer?

- Diagnosing OBDII code B0145 involves using a scan tool to retrieve the specific fault code, checking the auxiliary mode actuator for proper operation, and inspecting the wiring for any damage.

4. What is the typical repair for OBDII code B0145 in a Hummer?

- The typical repair for OBDII code B0145 involves replacing the faulty auxiliary mode actuator, repairing any damaged wiring, or reprogramming the HVAC control module if necessary.

5. Can I drive my Hummer with OBDII code B0145 related to the Auxiliary Mode Actuator?

- It is not recommended to drive your Hummer with OBDII code B0145 unaddressed, as it can lead to further HVAC system malfunctions and discomfort while driving.

6. Are there any DIY tips for fixing OBDII code B0145 in my Hummer?

- DIY tips for addressing OBDII code B0145 include checking and securing any loose wiring connections, ensuring proper actuator operation, and following the manufacturer's repair procedures.

7. How much does it cost to repair OBDII code B0145 in a Hummer?

- The cost of repairing OBDII code B0145 in a Hummer can vary depending on the specific issue, but it typically ranges from $200 to $500 including parts and labor.

8. Can a mechanic easily reset OBDII code B0145 in my Hummer after the repair?

- Yes, a mechanic can easily reset OBDII code B0145 using a scan tool after the necessary repairs have been completed to clear the fault code.

9. Will OBDII code B0145 cause my Hummer to fail an emissions test?

- Yes, OBDII code B0145 can cause your Hummer to fail an emissions test, as it indicates a problem with the auxiliary mode actuator affecting the HVAC system.

10. How do I prevent OBDII code B0145 from recurring in my Hummer?

- To prevent OBDII code B0145 from recurring, it's important to perform regular maintenance on the HVAC system, address any issues promptly, and follow the manufacturer's recommended service intervals.