AutoCodes – GMC – C0306 2015 GMC Sierra

C0306 2015 GMC Sierra Code - Range Actuator Control Circuit

Quick Answer

The Transfer Case Motor, also known as the transfer case range actuator, is a bi-directional, permanent magnet, DC motor. Common causes include Faulty Transfer Case Motor (Transfer Case Two/Four Wheel Drive Actuator), Transfer Case Motor harness is open or shorted, Transfer Case Motor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: C0306 2015 GMC Sierra indicates Range Actuator Control Circuit.
Common causes: Common causes include Faulty Transfer Case Motor (Transfer Case Two/Four Wheel Drive Actuator), Transfer Case Motor harness is open or shorted, Transfer Case Motor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 259

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 05, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C0306 2015 GMC Sierra Description

The Transfer Case Motor, also known as the transfer case range actuator, is a bi-directional, permanent magnet, DC motor. When energized, through the transfer case clockwise circuit or transfer case counterclockwise circuit, the ground is provided by the opposing motor control circuit which becomes grounded through the transfer case control module ground circuit. The transfer case range actuator, through a series of gears, rotates the transfer case control actuator shaft which moves the transfer case two/four-wheel drive actuator cam and transfer case high/low shift fork in order to shift the transfer case between the following modes or ranges: 2WD, 4WD/AWD Automatic, 4WD High/Locked, 4WD Low and Neutral.

OBDII Code C0306 2015 GMC Sierra - Range Actuator Control Circuit - AutoCodes.com — C0306 2015 GMC Sierra Code - Range Actuator Control Circuit

What does this mean?

What are the Possible Causes of the DTC C0306 2015 GMC Sierra?

Faulty Transfer Case Motor (Transfer Case Two/Four Wheel Drive Actuator)
Transfer Case Motor harness is open or shorted
Transfer Case Motor circuit poor electrical connection
Faulty Transfer Case Control Module

How to Fix the DTC C0306 2015 GMC Sierra?

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 C0306 2015 GMC Sierra 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 C0306 2015 GMC Sierra 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 C0306 2015 GMC Sierra Code

1. What does OBDII code C0306 for a 2015 GMC Sierra mean?

The code C0306 indicates a Range Actuator Control Circuit issue in the vehicle.

2. What are the common symptoms of OBDII code C0306 in a 2015 GMC Sierra?

Common symptoms include rough shifting, difficulty changing gears, and the transmission not engaging properly.

3. What are the possible causes of OBDII code C0306 in a 2015 GMC Sierra?

Potential causes include a faulty range actuator, damaged wiring or connectors, low transmission fluid, or a malfunctioning transmission control module.

4. How serious is OBDII code C0306 in a 2015 GMC Sierra?

While the vehicle may still be operable with this code, it is important to address it promptly to prevent further transmission damage and ensure safe driving conditions.

5. How can I diagnose OBDII code C0306 in my 2015 GMC Sierra?

Diagnosis typically involves using a scan tool to retrieve the trouble code, inspecting the range actuator and related components, and testing the circuit for faults.

6. Can I drive my 2015 GMC Sierra with OBDII code C0306?

It is not recommended to drive the vehicle extensively with this code present, as it can lead to transmission issues and potential safety hazards.

7. How can I repair OBDII code C0306 in my 2015 GMC Sierra?

Repair options may include replacing the range actuator, repairing or replacing damaged wiring, ensuring proper transmission fluid levels, and resetting the trouble code with a scan tool.

8. Can I reset OBDII code C0306 in my 2015 GMC Sierra without fixing the underlying issue?

While you can clear the code temporarily, it is crucial to address the root cause to prevent the problem from recurring and potentially causing more significant damage.

9. How much does it cost to fix OBDII code C0306 in a 2015 GMC Sierra?

The cost of repair can vary depending on the specific cause of the code, the required parts, and labor costs. It is advisable to consult a professional mechanic for an accurate estimate.

10. Is it common for a 2015 GMC Sierra to experience OBDII code C0306?

While not extremely common, this code can occur in vehicles due to various factors such as wear and tear, electrical issues, or component failures.