AutoCodes – Cadillac – B0145 Cadillac

B0145 Cadillac 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 Cadillac 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 1,087

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

What does this mean?

What are the Possible Causes of the DTC B0145 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac Code

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

- Common symptoms include inconsistent airflow from the vents, inability to switch between different air modes (e.g., defrost, floor, dash), and unusual noises coming from the HVAC system.

2. What typically causes the OBDII code B0145 related to the Auxiliary Mode Actuator in a Cadillac?

- The code B0145 in a Cadillac usually indicates a malfunction or failure within the Auxiliary Mode Actuator, which controls the direction of airflow in the HVAC system.

3. How can I diagnose the issue causing OBDII code B0145 in my Cadillac related to the Auxiliary Mode Actuator?

- To diagnose the issue, you can perform a visual inspection of the actuator for any physical damage, check the actuator's electrical connections for proper voltage, and use a scan tool to retrieve specific diagnostic trouble codes.

4. What are some possible repair tips for fixing OBDII code B0145 in a Cadillac related to the Auxiliary Mode Actuator?

- Repair tips may include replacing the faulty Auxiliary Mode Actuator, checking and repairing any damaged wiring or connectors, and resetting the HVAC system's control module.

5. Can I drive my Cadillac with OBDII code B0145 related to the Auxiliary Mode Actuator without causing further damage?

- It is not recommended to drive your Cadillac with this code unresolved, as it may lead to discomfort due to improper airflow control or potentially cause further damage to the HVAC system components.

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

- While you can clear the code temporarily, it will likely reappear if the root cause of the problem, such as a faulty actuator, is not addressed.

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

- The cost of repairing this code can vary depending on the exact cause of the issue, but it may involve replacing the actuator, which could range from $200 to $500 including parts and labor.

8. Are there any preventative maintenance steps I can take to avoid encountering OBDII code B0145 related to the Auxiliary Mode Actuator in my Cadillac?

- Regularly servicing the HVAC system, checking for any unusual noises or airflow issues, and addressing any problems promptly can help prevent the occurrence of this code.

9. Can I fix OBDII code B0145 in my Cadillac related to the Auxiliary Mode Actuator myself, or should I seek professional help?

- While some DIY enthusiasts may be able to replace the actuator themselves, it is recommended to consult a professional mechanic for an accurate diagnosis and proper repair to ensure the issue is resolved effectively.

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

- The repair time can vary depending on the exact cause of the issue, but replacing the Auxiliary Mode Actuator usually takes around 1-2 hours for a qualified mechanic.