C0306 Buick 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 Buick 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.
Code C0306 Buick Description
What are the Possible Causes of the DTC C0306 Buick?
- 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 Buick?
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 Buick 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 Buick code?
Need more information on how to fix the C0306 Buick code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the C0306 Buick code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about C0306 Buick Code
1. What does the OBDII code C0306 mean on a Buick?
C0306 indicates a problem with the Range Actuator Control Circuit, which controls the transfer case in vehicles with all-wheel drive or 4WD systems.
2. What are the common symptoms of the C0306 code?
Symptoms may include the 4WD system not engaging or disengaging properly, warning lights on the dashboard, or unusual noises from the transfer case.
3. What causes the C0306 code to appear?
Common causes include a faulty range actuator motor, damaged wiring or connectors in the control circuit, or a malfunctioning transfer case control module (TCCM).
4. How can I diagnose the C0306 code on my Buick?
Diagnosis typically involves scanning for codes, inspecting the range actuator motor and its wiring, and testing the transfer case control module for proper operation.
5. Can I still drive my Buick with the C0306 code?
You can usually drive the vehicle, but 4WD or AWD functionality may be compromised, potentially affecting handling in poor road conditions.
6. How do I fix the C0306 code on a Buick?
Repairs may involve replacing the range actuator motor, repairing damaged wiring or connectors, or reprogramming or replacing the transfer case control module.
7. Is the C0306 code specific to Buicks with AWD or 4WD?
Yes, this code typically applies to Buicks equipped with AWD or 4WD systems, as it relates to the transfer case and its control circuit.
8. How much does it cost to fix the C0306 code?
The cost varies depending on the issue, ranging from $100 for wiring repairs to $500 or more for replacing the actuator or control module.
9. Can a bad fuse cause the C0306 code?
Yes, a blown fuse in the transfer case control circuit can disrupt power to the range actuator, triggering the C0306 code.
10. Do I need to clear the C0306 code after repairs?
Yes, after completing repairs, use an OBDII scanner to clear the code and confirm that the issue is resolved.
Discuss the causes and fixes for C0306 Buick OBDII Code
Code C0306 Buick comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
