AutoCodes – Pontiac – B0145 Pontiac

B0145 Pontiac 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 Pontiac 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 1,414

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

What does this mean?

What are the Possible Causes of the DTC B0145 Pontiac?

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 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 B0145 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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Need Help with the Code?

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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 Pontiac Code

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

The common symptoms include issues with the air distribution system, such as improper airflow distribution from the vents or inconsistencies in temperature control.

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

The code B0145 typically indicates a fault in the Auxiliary Mode Actuator itself, which may be due to a malfunctioning actuator motor, wiring issues, or a faulty control module.

3. How can I diagnose the OBDII code B0145 in my Pontiac's Auxiliary Mode Actuator?

Diagnosis involves using a scan tool to retrieve the specific fault code, inspecting the actuator and its wiring for any visible damage, and testing the actuator's functionality using a multimeter.

4. Can I continue driving my Pontiac with the OBDII code B0145 related to the Auxiliary Mode Actuator?

While technically you can drive with this code, it is recommended to address the issue promptly to avoid further damage to the HVAC system and ensure proper climate control functionality.

5. What are some repair tips for fixing the OBDII code B0145 in a Pontiac's Auxiliary Mode Actuator?

Repair tips include checking and repairing any damaged wiring, replacing the faulty actuator motor if necessary, and resetting the system after making repairs to clear the fault code.

6. Is it possible to reset the OBDII code B0145 in a Pontiac without fixing the issue with the Auxiliary Mode Actuator?

Resetting the code without addressing the underlying issue may temporarily clear the warning light, but the code is likely to return if the root cause of the problem is not fixed.

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

The cost of repair can vary depending on the exact cause of the issue and whether you choose to do the repairs yourself or take your Pontiac to a professional mechanic. Costs can range from a few hundred dollars to over a thousand dollars.

8. Can a DIY enthusiast with basic automotive skills fix the OBDII code B0145 in their Pontiac's Auxiliary Mode Actuator?

Yes, if you have the necessary tools and knowledge, you can attempt to diagnose and repair the issue yourself. However, if you are unsure or uncomfortable with the process, it is best to seek help from a professional.

9. Are there any preventive measures to avoid the OBDII code B0145 in a Pontiac's Auxiliary Mode Actuator?

Regularly inspecting and maintaining your Pontiac's HVAC system, including checking for any unusual noises or airflow issues, can help prevent issues that may trigger the B0145 fault code.

10. How long does it typically take to repair the OBDII code B0145 in a Pontiac caused by the Auxiliary Mode Actuator issue?

The repair time can vary depending on the extent of the problem and your experience level. It may take anywhere from a couple of hours to a full day to diagnose and fix the issue with the Auxiliary Mode Actuator.