AutoCodes – Generic – C0374

C0374 Code - Transfer Case System Malfunction

Quick Answer

The transfer case shift control module senses rear slip. Common causes include Faulty Transfer Case Motor/Encoder, Transfer Case Motor/Encoder harness is open or shorted, Transfer Case Motor/Encoder 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: C0374 indicates Transfer Case System Malfunction.
Common causes: Common causes include Faulty Transfer Case Motor/Encoder, Transfer Case Motor/Encoder harness is open or shorted, Transfer Case Motor/Encoder 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 9,143

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 26, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C0374 Description

The transfer case shift control module senses rear slip. After several attempts of applying torque to the front wheels, by activating the encoder motor, the transfer case still sees a difference in speed between the front propshaft speed sensor and rear propshaft speed sensor. The transfer case shift control module is unable to correct sensed wheel slip for 10 consecutive seconds.

OBDII Code C0374 - Transfer Case System Malfunction - AutoCodes.com — C0374 Code - Transfer Case System Malfunction

What does this mean?

What are the Possible Causes of the DTC C0374?

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

How to Fix the DTC C0374?

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 C0374 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 C0374 code?

Need more information on how to fix the C0374 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C0374 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C0374 Buick — Transfer Case System Malfunction
C0374 Cadillac — Transfer Case System Malfunction
C0374 Chevrolet — Transfer Case System Malfunction
C0374 GMC — Transfer Case System Malfunction
C0374 Oldsmobile — Transfer Case System Malfunction
C0374 Saab — Transfer Case System Malfunction

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 C0374 Code

1. What are the common symptoms of OBDII code C0374 (Transfer Case System Malfunction)?

- Common symptoms include the vehicle getting stuck in a particular drive mode, difficulty shifting gears, and warning lights illuminating on the dashboard.

2. What are the possible causes of OBDII code C0374?

- Possible causes include a malfunctioning transfer case control module, damaged wiring or connectors in the transfer case system, or issues with the transfer case motor.

3. How can I diagnose OBDII code C0374?

- Diagnosis typically involves using a diagnostic scanner to retrieve the trouble code, conducting a visual inspection of the transfer case components, and testing the transfer case control module and motor for proper functionality.

4. Can I still drive my vehicle with OBDII code C0374 present?

- It is not recommended to drive the vehicle with this code present, as it could lead to further damage to the transfer case system and potentially result in unsafe driving conditions.

5. How can I repair OBDII code C0374?

- Repair options include replacing the transfer case control module, repairing or replacing damaged wiring or connectors, and addressing any issues with the transfer case motor.

6. Is it possible to reset OBDII code C0374 without fixing the underlying issue?

- While clearing the code may temporarily turn off the warning light, the underlying issue causing the malfunction will persist and may lead to further problems down the line.

7. Can extreme weather conditions trigger OBDII code C0374?

- Yes, extreme weather conditions such as cold temperatures or water exposure can sometimes trigger this code due to their impact on the transfer case components.

8. How much does it typically cost to repair OBDII code C0374?

- Repair costs can vary depending on the specific issue causing the code, but it is advisable to consult with a professional mechanic for an accurate assessment and cost estimate.

9. Are there any preventive maintenance tips to avoid OBDII code C0374?

- Regularly inspecting and maintaining the transfer case system, checking for leaks, and addressing any warning signs promptly can help prevent the occurrence of code C0374.

10. Can OBDII code C0374 be intermittent or does it always require immediate attention?

- While the code can sometimes be intermittent, it is generally recommended to address the underlying issue promptly to prevent further damage to the transfer case system.