AutoCodes – Chevrolet – B0408 2015 Chevrolet Silverado

B0408 2015 Chevrolet Silverado Code - Main Temperature Control Circuit

Quick Answer

Stepper motors are used for temperature regulation, air distribution control and recirculation door control. Common causes include Faulty Air Temperature Actuator, Air Temperature Actuator harness is open or shorted, 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: B0408 2015 Chevrolet Silverado indicates Main Temperature Control Circuit.
Common causes: Common causes include Faulty Air Temperature Actuator, Air Temperature Actuator harness is open or shorted, 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 485

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 29, 2024

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B0408 2015 Chevrolet Silverado Description

Stepper motors are used for temperature regulation, air distribution control and recirculation door control. With the switches and dials on the HVAC controls, air temperature door position, mode door position and recirculation door position can be selected. The selected values are passed to the Heating, Ventilation, and Air Conditioning (HVAC) Control Module via serial data. The HVAC control module supplies a 12 V reference voltage to the stepper motors and energizes the 4 stepper motor coils with a pulsed ground signal. The stepper motors move the appropriate doors into the calculated positions, in order to reach the desired positions.

OBDII Code B0408 2015 Chevrolet Silverado - Main Temperature Control Circuit - AutoCodes.com — B0408 2015 Chevrolet Silverado Code - Main Temperature Control Circuit

What does this mean?

What are the Possible Causes of the DTC B0408 2015 Chevrolet Silverado?

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

How to Fix the DTC B0408 2015 Chevrolet Silverado?

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 does this mean?

Code Tech Notes

B0413:02 Main Temperature Control Circuit Short to Ground
B0413:05 Main Temperature Control Circuit Short to Battery or Open
B0413:61 Main Temperature Control Circuit Actuator Stuck Open

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B0408 2015 Chevrolet Silverado 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 B0408 2015 Chevrolet Silverado code?

Need more information on how to fix the B0408 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0408 2015 Chevrolet Silverado 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 B0408 2015 Chevrolet Silverado Code

1. What is OBDII code B0408 for a 2015 Chevrolet Silverado?

The B0408 code on a 2015 Chevrolet Silverado relates to the Main Temperature Control Circuit.

2. What are common symptoms of OBDII code B0408 in a 2015 Chevrolet Silverado?

Common symptoms of code B0408 may include inconsistent heating or cooling from the HVAC system, the inability to adjust temperature settings, or the climate control system not responding properly.

3. What are possible causes of OBDII code B0408 in a 2015 Chevrolet Silverado?

Potential causes of code B0408 include a faulty main temperature control actuator, wiring issues, a defective control module, or a malfunctioning blend door.

4. How can I diagnose OBDII code B0408 in my 2015 Chevrolet Silverado?

Diagnosing code B0408 typically involves using an OBDII scanner to retrieve the code, checking the main temperature control actuator for proper operation, inspecting the wiring for any damage, and testing the control module for functionality.

5. Can I continue driving my 2015 Chevrolet Silverado with OBDII code B0408?

While the vehicle may still be operable with code B0408, it is recommended to address the issue promptly to avoid potential HVAC system malfunctions or discomfort while driving.

6. How can I repair OBDII code B0408 in my 2015 Chevrolet Silverado?

Repairing code B0408 may involve replacing the main temperature control actuator, repairing any damaged wiring, resetting the control module, or recalibrating the blend door to restore proper functionality.

7. Is OBDII code B0408 a common issue in 2015 Chevrolet Silverado vehicles?

Code B0408 can be a relatively common issue in 2015 Chevrolet Silverado vehicles, especially in models with higher mileage or older components that may be more prone to failure.

8. Can weather conditions affect the occurrence of OBDII code B0408 in a 2015 Chevrolet Silverado?

Extreme weather conditions, such as excessive heat or cold, can potentially exacerbate the symptoms associated with code B0408 due to increased strain on the HVAC system components.

9. Are there any preventative maintenance tips to avoid OBDII code B0408 in my 2015 Chevrolet Silverado?

Regularly servicing the HVAC system, checking for any unusual noises or odors, and addressing temperature control issues promptly can help prevent the occurrence of code B0408 in your 2015 Chevrolet Silverado.

10. How much does it typically cost to repair OBDII code B0408 in a 2015 Chevrolet Silverado?

The cost of repairing code B0408 can vary depending on the specific issue, parts needed, labor rates, and location. It is advisable to consult a professional mechanic for an accurate diagnosis and cost estimate.