AutoCodes – Chevrolet – B0408 2016 Chevrolet Silverado

B0408 2016 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 2016 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 412

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 2016 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 2016 Chevrolet Silverado - Main Temperature Control Circuit - AutoCodes.com — B0408 2016 Chevrolet Silverado Code - Main Temperature Control Circuit

What does this mean?

What are the Possible Causes of the DTC B0408 2016 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 2016 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 2016 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 2016 Chevrolet Silverado code?

Need more information on how to fix the B0408 2016 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0408 2016 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 2016 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code B0408 in a 2016 Chevrolet Silverado?

The common symptoms of OBDII code B0408 in a 2016 Chevrolet Silverado include inconsistent temperature control inside the vehicle, improper heating or cooling functions, and the inability to adjust the cabin temperature.

2. What does the OBDII code B0408 for the Main Temperature Control Circuit indicate in a 2016 Chevrolet Silverado?

The OBDII code B0408 indicates a malfunction in the main temperature control circuit of the HVAC system in a 2016 Chevrolet Silverado.

3. What are the possible causes of OBDII code B0408 in a 2016 Chevrolet Silverado?

Possible causes of OBDII code B0408 in a 2016 Chevrolet Silverado may include a faulty blend door actuator, a damaged wiring harness, a malfunctioning control module, or a problem with the HVAC system's temperature sensors.

4. How can I diagnose the main temperature control circuit issue related to OBDII code B0408 in my 2016 Chevrolet Silverado?

Diagnosing the main temperature control circuit issue related to OBDII code B0408 in a 2016 Chevrolet Silverado involves conducting a thorough inspection of the blend door actuator, checking the wiring for any visible damage, testing the control module, and verifying the performance of the temperature sensors.

5. Can I continue driving my 2016 Chevrolet Silverado with OBDII code B0408 present?

While it may be possible to continue driving the vehicle with OBDII code B0408 present, it is not recommended as it can lead to discomfort due to inconsistent temperature control and may potentially worsen the underlying issue over time.

6. How can I repair OBDII code B0408 in my 2016 Chevrolet Silverado?

Repairing OBDII code B0408 in a 2016 Chevrolet Silverado typically involves replacing the faulty blend door actuator, repairing or replacing damaged wiring, resetting the control module, or recalibrating the temperature sensors as needed.

7. Is it necessary to visit a mechanic for OBDII code B0408 in a 2016 Chevrolet Silverado?

While some DIY enthusiasts may be able to address OBDII code B0408 themselves, it is recommended to consult a qualified mechanic for proper diagnosis and repair to ensure the issue is resolved correctly.

8. Will resetting the OBDII system clear the B0408 code in my 2016 Chevrolet Silverado?

Resetting the OBDII system may temporarily clear the B0408 code in a 2016 Chevrolet Silverado, but if the underlying issue causing the code is not addressed, it is likely to reappear after some time.

9. How much does it typically cost to repair OBDII code B0408 in a 2016 Chevrolet Silverado?

The cost of repairing OBDII code B0408 in a 2016 Chevrolet Silverado can vary depending on the specific issue causing the code, the required parts, labor costs, and whether the repair is performed by a dealership or an independent mechanic.

10. Are there any preventive maintenance steps to avoid OBDII code B0408 in a 2016 Chevrolet Silverado?

To prevent OBDII code B0408 in a 2016 Chevrolet Silverado, it is advisable to regularly inspect and maintain the HVAC system, address any temperature control issues promptly, and follow the manufacturer's recommended service schedule for optimal system performance.