AutoCodes – GMC – C0315 GMC

C0315 GMC Code - Module Ground Circuit

Quick Answer

The transfer case motor is a bi-directional, permanent magnet, D.C. Common causes include Faulty Transfer Case Shift Control Module, Transfer Case Shift Control Module harness is open or shorted, Transfer Case Shift Control Module 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: C0315 GMC indicates Module Ground Circuit.
Common causes: Common causes include Faulty Transfer Case Shift Control Module, Transfer Case Shift Control Module harness is open or shorted, Transfer Case Shift Control Module 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 1,088

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
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code C0315 GMC 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.

OBDII Code C0315 GMC - Module Ground Circuit - AutoCodes.com — C0315 GMC Code - Module Ground Circuit

What does this mean?

What are the Possible Causes of the DTC C0315 GMC?

Faulty Transfer Case Shift Control Module
Transfer Case Shift Control Module harness is open or shorted
Transfer Case Shift Control Module circuit poor electrical connection

How to Fix the DTC C0315 GMC?

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 does this mean?

Code Tech Notes

Transfer Case Shift Control Module

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C0315 GMC 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 C0315 GMC Code

1. What does the OBDII code C0315 mean on a GMC vehicle?

C0315 indicates an issue with the module ground circuit, typically related to the transfer case control module (TCCM) or a similar system.

2. What are the common symptoms of the C0315 code in a GMC?

Symptoms may include the 4WD system not engaging or disengaging, warning lights on the dashboard, or erratic 4WD operation.

3. What causes the C0315 code in a GMC vehicle?

This code is often caused by poor ground connections, damaged wiring, corroded terminals, or a faulty transfer case control module.

4. How do I diagnose the C0315 code on my GMC?

Start by inspecting the ground connections and wiring for damage or corrosion, then test the voltage at the TCCM to ensure proper electrical signals.

5. Can a bad transfer case control module cause the C0315 code?

Yes, a malfunctioning TCCM can trigger this code if it cannot properly communicate or function due to internal failure.

6. How do I fix the C0315 code on a GMC?

Repair or clean any damaged or corroded ground connections, replace faulty wiring, and, if necessary, replace the transfer case control module.

7. Is the C0315 code serious in a GMC vehicle?

While not immediately dangerous, it can affect 4WD functionality, which may be critical in off-road or poor weather conditions.

8. Can I drive my GMC with the C0315 code active?

You can drive the vehicle, but the 4WD system may not work properly, which can affect traction and handling in certain conditions.

9. What tools are needed to troubleshoot the C0315 code?

You'll need an OBDII scanner, a multimeter to check voltage, and basic tools to inspect and repair wiring or ground connections.

10. How much does it cost to fix the C0315 code on a GMC?

Repairs can range from $50 to $500 depending on whether youâ€™re repairing wiring or replacing the transfer case control module.

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