AutoCodes – Generic – B0415

B0415 Code - Temperature Control Left Feedback Circuit Actuator Low

Quick Answer

The Heating, Ventilation, and Air Conditioning (HVAC) Control Module controls the HVAC door actuators to regulate the airflow through the HVAC system. Common causes include Faulty Left Air Temperature Actuator, Left Air Temperature Actuator harness is open or shorted, Left Air Temperature 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: B0415 indicates Temperature Control Left Feedback Circuit Actuator Low.
Common causes: Common causes include Faulty Left Air Temperature Actuator, Left Air Temperature Actuator harness is open or shorted, Left Air Temperature 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 1,633

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 11, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B0415 Description

The Heating, Ventilation, and Air Conditioning (HVAC) Control Module controls the HVAC door actuators to regulate the airflow through the HVAC system. Each actuator consists of a stepper motor, a logic circuit, and a potentiometer. The potentiometer inside the door actuator allows the module to monitor the current position of the actuator drive shaft. The module supplies a 5-volt source voltage to the potentiometer on the 5-volt reference circuit. The module supplies ground to the potentiometer through the low reference circuit. The HVAC control module monitors the voltage drop across the potentiometer on the door position signal circuit. When the actuator shaft rotates, the voltage on the door position signal circuit changes. The module converts the voltage value to a count value where 1-volt is approximately equal to 51 counts. The 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 B0415 - Temperature Control Left Feedback Circuit Actuator Low - AutoCodes.com — B0415 Code - Temperature Control Left Feedback Circuit Actuator Low

What does this mean?

What are the Possible Causes of the DTC B0415?

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

How to Fix the DTC B0415?

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 B0415 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 B0415 code?

Need more information on how to fix the B0415 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0415 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B0415 Buick — Temperature Control Left Feedback Circuit Actuator Low
B0415 Cadillac — Temperature Control Left Feedback Circuit Actuator Low
B0415 Chevrolet — Temperature Control Left Feedback Circuit Actuator Low
B0415 GMC — Temperature Control Left Feedback Circuit Actuator Low
B0415 Pontiac — Temperature Control Left Feedback Circuit Actuator Low
B0415 Saturn — Temperature Control Left Feedback Circuit Actuator Low

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 B0415 Code

1. What does the OBDII code B0415 mean?

Code B0415 indicates an issue with the temperature control left feedback circuit actuator, specifically detecting a low signal or voltage.

2. What are the symptoms of code B0415?

Common symptoms include inconsistent or no temperature control on the left side of the vehicle, unusual noises from the HVAC system, or a check engine light.

3. What causes the B0415 code to appear?

The code is often caused by a faulty temperature control actuator, wiring issues like frayed or corroded wires, or a malfunctioning HVAC control module.

4. Can I drive my car with a B0415 code?

Yes, you can drive with this code, but your left-side temperature control may not function properly, potentially affecting cabin comfort.

5. How do I diagnose the B0415 code?

Start by inspecting the left temperature control actuator, wiring, and connectors for damage. Use a scan tool to monitor actuator position and test the circuit voltage.

6. How do I fix the B0415 code?

Repairs may include replacing the left temperature control actuator, repairing or replacing damaged wiring, or reprogramming/updating the HVAC control module.

7. How much does it cost to repair a B0415 code?

Repair costs vary but typically range from $150 to $400, depending on whether the actuator or wiring needs replacement.

8. Can a reset clear the B0415 code?

Resetting the code may temporarily clear it, but the underlying issue must be fixed to prevent it from returning.

9. What tools are needed to repair a B0415 code?

You may need a multimeter for testing voltage, a scan tool for diagnostics, and basic hand tools to access and replace the actuator.

10. Is the B0415 code specific to certain vehicles?

This code is most commonly found in GM vehicles but can appear in other makes and models with similar HVAC systems. Always refer to your vehicleâ€™s service manual for specifics.