AutoCodes – Generic – C0308

C0308 Code - Motor A/B Circuit Low

Quick Answer

The transfer case motor is a bi-directional, permanent magnet, D.C. Common causes include Faulty Transfer Case Motor, 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: C0308 indicates Motor A/B Circuit Low.
Common causes: Common causes include Faulty Transfer Case Motor, 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 7,723

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 Jun 18, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C0308 Description

The transfer case motor is a bi-directional, permanent magnet, D.C. motor. When energized, (through Motor Control A or Motor Control B, the ground is provided by the opposing Motor Control circuit and then grounded through the transfer case shift control module ground circuit), the motor, through a series of gears, rotates a shaft which moves the mode and range forks to shift the transfer case between 4H, AUTO 4WD, 2H, N, and 4L ranges. While the transfer case motor is energized the transfer case shift control module also energizes the solenoid for the transfer case lock. The motor lock is disabled (locking action released) and free turning of the transfer case motor and sector shaft is then allowed.
This DTC detects a short to ground in Motor Control A or Motor Control B CKT.

OBDII Code C0308 - Motor A/B Circuit Low - AutoCodes.com — C0308 Code - Motor A/B Circuit Low

What does this mean?

What are the Possible Causes of the DTC C0308?

Faulty Transfer Case Motor
Transfer Case Motor harness is open or shorted
Transfer Case Motor circuit poor electrical connection

How to Fix the DTC C0308?

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 C0308 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 C0308 code?

Need more information on how to fix the C0308 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C0308 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C0308 Buick — Motor A/B Circuit Low
C0308 Cadillac — Motor A/B Circuit Low
C0308 Chevrolet — Motor A/B Circuit Low
C0308 GMC — Motor A/B Circuit Low

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 C0308 Code

1. What are the common symptoms of OBDII code C0308 - Motor A/B Circuit Low?

- Common symptoms include difficulty starting the vehicle, rough idling, decreased engine performance, and potential stalling.

2. What are the possible causes of OBDII code C0308 - Motor A/B Circuit Low?

- The code may be triggered by issues such as a faulty motor or actuator, damaged wiring or connectors, or a malfunctioning control module.

3. How can I diagnose the cause of OBDII code C0308 - Motor A/B Circuit Low?

- To diagnose the issue, use a scan tool to read the code, inspect the wiring and connectors for damage, and test the motor or actuator for proper function.

4. Can I drive my vehicle with OBDII code C0308 - Motor A/B Circuit Low?

- It is not recommended to drive the vehicle with this code present, as it can lead to further damage and potential safety hazards.

5. How do I repair OBDII code C0308 - Motor A/B Circuit Low?

- Repair options may include replacing the faulty motor or actuator, repairing damaged wiring or connectors, or resetting the control module.

6. Are there any DIY tips for fixing OBDII code C0308 - Motor A/B Circuit Low?

- DIY tips may include checking and cleaning connectors, ensuring proper wiring connections, and following manufacturer-specific repair procedures.

7. Can a mechanic help me fix OBDII code C0308 - Motor A/B Circuit Low?

- Yes, a qualified mechanic can diagnose the issue accurately and perform the necessary repairs to resolve the code.

8. How much does it typically cost to fix OBDII code C0308 - Motor A/B Circuit Low?

- The cost of repairs can vary depending on the specific cause of the code, but it may range from a few hundred to a few thousand dollars.

9. Will resetting the OBDII code C0308 - Motor A/B Circuit Low turn off the check engine light?

- Resetting the code may temporarily turn off the check engine light, but it will likely reappear if the underlying issue is not addressed.

10. How often does OBDII code C0308 - Motor A/B Circuit Low occur in vehicles?

- This code can occur in vehicles equipped with the relevant components, such as motors or actuators controlled by the onboard computer.

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