AutoCodes – Cadillac – C0308 Cadillac

C0308 Cadillac 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 Cadillac 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 897

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

What does this mean?

What are the Possible Causes of the DTC C0308 Cadillac?

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 Cadillac?

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 Cadillac 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 C0308 Cadillac Code

1. What are the common symptoms of OBDII code C0308 "Motor A/B Circuit Low" in a Cadillac?

- Common symptoms include issues with power window operation, power seat movement, or other power accessories.

2. What are the possible causes of OBDII code C0308 in a Cadillac?

- The code C0308 can be triggered by a faulty motor, damaged wiring, a malfunctioning control module, or poor electrical connections.

3. How can I diagnose the cause of OBDII code C0308 in my Cadillac?

- To diagnose code C0308, you may need to perform a visual inspection of wiring and connectors, test the motor operation, and use a scan tool to check for related codes.

4. Can I drive my Cadillac with OBDII code C0308 present?

- It is generally safe to drive your Cadillac with code C0308, but it is recommended to address the issue promptly to prevent further damage or inconvenience.

5. How can I repair OBDII code C0308 in my Cadillac?

- Repair options include replacing the faulty motor, repairing damaged wiring, addressing issues with the control module, and ensuring all electrical connections are secure.

6. Is it possible to reset OBDII code C0308 in a Cadillac without fixing the underlying issue?

- While you can clear the code with a scan tool, it is important to address the root cause to prevent the code from reoccurring.

7. Can a DIY enthusiast fix OBDII code C0308 in a Cadillac?

- Depending on your skill level and access to tools, DIY enthusiasts may be able to diagnose and repair code C0308, especially if the issue is related to wiring or connectors.

8. How much does it cost to repair OBDII code C0308 in a Cadillac at a dealership or repair shop?

- Repair costs can vary depending on the exact cause of the code, but expect to pay for parts and labor, which can range from $100 to $500 or more.

9. Will fixing OBDII code C0308 improve the overall performance of my Cadillac?

- Resolving code C0308 can restore proper operation of power accessories, improving the convenience and functionality of your Cadillac.

10. How can I prevent OBDII code C0308 from occurring in my Cadillac in the future?

- Regular maintenance, checking electrical connections, and addressing any issues promptly can help prevent code C0308 from reoccurring in your Cadillac.