AutoCodes – Hummer – C0306 Hummer

C0306 Hummer 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 Hummer 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 7,487

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 Hummer 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 Hummer - Range Actuator Control Circuit - AutoCodes.com — C0306 Hummer Code - Range Actuator Control Circuit

What does this mean?

What are the Possible Causes of the DTC C0306 Hummer?

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 Hummer?

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 Hummer 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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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 Hummer Code

1. What are common symptoms of OBDII code C0306 in a Hummer?

- Common symptoms include difficulty shifting gears, reduced fuel efficiency, and potentially harsh or delayed transmission engagement.

2. What typically causes the OBDII code C0306 in a Hummer?

- The most common cause of code C0306 in a Hummer is a malfunction in the range actuator control circuit, which may be due to wiring issues, a faulty range actuator motor, or a problem with the control module.

3. How can I diagnose the OBDII code C0306 in my Hummer?

- Diagnosis of code C0306 involves using an OBDII scanner to retrieve the trouble code and then conducting a thorough inspection of the range actuator control circuit components, such as the wiring, connectors, actuator motor, and control module.

4. What are some repair tips for fixing OBDII code C0306 in a Hummer?

- Repair tips for code C0306 may include checking and repairing any damaged wiring or connectors, replacing the range actuator motor if faulty, and reprogramming or replacing the control module if necessary.

5. Can I drive my Hummer with OBDII code C0306?

- It is not recommended to drive your Hummer with an unresolved OBDII code C0306, as it can lead to further transmission issues and potentially unsafe driving conditions.

6. How much does it typically cost to repair OBDII code C0306 in a Hummer?

- The cost of repairing OBDII code C0306 in a Hummer can vary depending on the underlying cause, but it may range from a few hundred to a few thousand dollars, including parts and labor.

7. Are there any preventative maintenance measures to avoid OBDII code C0306 in a Hummer?

- To help prevent OBDII code C0306, it is advisable to regularly inspect and maintain the transmission system, including checking for any signs of wear or damage in the range actuator control circuit components.

8. Can a DIY enthusiast fix OBDII code C0306 in a Hummer?

- While some DIY enthusiasts may have the skills to diagnose and repair OBDII code C0306, it is recommended to consult a professional mechanic or technician for proper diagnosis and repair to ensure the issue is resolved correctly.

9. How long does it typically take to repair OBDII code C0306 in a Hummer?

- The repair time for OBDII code C0306 can vary depending on the specific cause and extent of the issue, but it may take anywhere from a few hours to a full day to complete the necessary repairs.

10. Will resetting the OBDII system clear code C0306 in a Hummer?

- Resetting the OBDII system may temporarily clear the trouble code, but if the underlying issue causing code C0306 is not addressed and repaired, the code is likely to reappear upon driving or system self-checks.