AutoCodes – Saturn – B0145 Saturn

B0145 Saturn 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 Saturn 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,162

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

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

What does this mean?

What are the Possible Causes of the DTC B0145 Saturn?

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 Saturn?

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 Saturn 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.

Need more information about the B0145 Saturn code?

Need more information on how to fix the B0145 Saturn code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0145 Saturn 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 Saturn Code

1. What are the common symptoms of OBDII code B0145 (Saturn) related to the Auxiliary Mode Actuator?

The common symptoms include issues with the airflow direction from the HVAC system, such as inconsistent airflow or the inability to switch between different modes (e.g., defrost, floor, vent).

2. What are the possible causes of OBDII code B0145 (Saturn) for the Auxiliary Mode Actuator?

The code B0145 (Saturn) typically indicates a malfunction in the Auxiliary Mode Actuator, which can be caused by a faulty actuator motor, damaged wiring, or a failed HVAC control module.

3. How can I diagnose OBDII code B0145 (Saturn) for the Auxiliary Mode Actuator?

Diagnosing OBDII code B0145 involves using a diagnostic scanner to retrieve the specific code, checking the actuator's wiring and connectors for any damage, and testing the actuator's operation using a multimeter.

4. Can I repair OBDII code B0145 (Saturn) related to the Auxiliary Mode Actuator myself?

While some DIY enthusiasts may attempt to repair this code themselves, it is recommended to consult a professional mechanic for proper diagnosis and repair, as accessing the actuator may require disassembling parts of the HVAC system.

5. Is it safe to continue driving with OBDII code B0145 (Saturn) triggered for the Auxiliary Mode Actuator?

While the vehicle may still be operable with this code triggered, it is advisable to address the issue promptly to ensure proper functioning of the HVAC system, especially in extreme weather conditions where defrost and ventilation are crucial.

6. How much does it typically cost to repair OBDII code B0145 (Saturn) associated with the Auxiliary Mode Actuator?

Repair costs for OBDII code B0145 can vary depending on the underlying issue, but they may range from $150 to $500, including parts and labor. Costs can increase if additional components need to be replaced.

7. Can a faulty Auxiliary Mode Actuator affect the overall performance of the vehicle?

While a faulty Auxiliary Mode Actuator primarily affects the HVAC system's operation, it can indirectly impact driver comfort and visibility, especially in adverse weather conditions.

8. Are there any preventive maintenance tips to avoid triggering OBDII code B0145 (Saturn) for the Auxiliary Mode Actuator?

To prevent issues with the Auxiliary Mode Actuator, it is recommended to regularly inspect and maintain the HVAC system, including checking for proper airflow and addressing any unusual noises or malfunctions promptly.

9. How long does it typically take to repair OBDII code B0145 (Saturn) related to the Auxiliary Mode Actuator?

The repair time for OBDII code B0145 can vary depending on the extent of the issue and the accessibility of the actuator. On average, it may take a professional mechanic 1-2 hours to diagnose and repair the problem.

10. Can resetting the OBDII system clear the B0145 code related to the Auxiliary Mode Actuator?

While resetting the OBDII system may temporarily clear the B0145 code, it is crucial to address the underlying issue causing the code to prevent it from reoccurring. Resetting alone does not fix the problem.