AutoCodes – GMC – C0398 2015 GMC Sierra

C0398 2015 GMC Sierra Code - Range Actuator Position - Range Position Correlation

Quick Answer

The Transfer Case Control Module always monitors the Gear Position Sensor signal circuit and the Transfer Case Range Actuator Position Sensor signal circuit. Common causes include Faulty Transfer Case Range Actuator Position Sensor, Transfer Case Range Actuator Position Sensor harness is open or shorted, Transfer Case Range Actuator Position Sensor 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: C0398 2015 GMC Sierra indicates Range Actuator Position - Range Position Correlation.
Common causes: Common causes include Faulty Transfer Case Range Actuator Position Sensor, Transfer Case Range Actuator Position Sensor harness is open or shorted, Transfer Case Range Actuator Position Sensor 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 587

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 Jul 12, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C0398 2015 GMC Sierra Description

The Transfer Case Control Module always monitors the Gear Position Sensor signal circuit and the Transfer Case Range Actuator Position Sensor signal circuit. The signal voltage values are converted to degrees to determine the position of the transfer case. The Transfer Case Control Module continuously compares the position of the Transfer Case Range Actuator Position Sensor to that of the Gear Position Sensor. If the positions do not match within a pre-determined range, it is considered an error and a fault is set. The Transfer Case Range Actuator Position Sensor is a higher resolution sensor and is more accurate but requires the Gear Position Sensor for correlation check at ignition ON and during transfer case range changes. The Diagnostic Trouble Code (DTC) will be set when the Range Actuator Position Sensor and the Range Position Sensor are both showing valid positions but differ by greater than a predetermined amount when no range change is in progress. The Transfer Case Range Actuator Position Sensor, also known as the incremental position sensor, is part of the Transfer Case Motor. The Gear Position Sensor, also known as the Transfer Case Range Actuator Position Sensor, the Two/Four Wheel Drive Actuator Position Sensor, or the rotational position sensor.

OBDII Code C0398 2015 GMC Sierra - Range Actuator Position - Range Position Correlation - AutoCodes.com — C0398 2015 GMC Sierra Code - Range Actuator Position - Range Position Correlation

What does this mean?

What are the Possible Causes of the DTC C0398 2015 GMC Sierra?

Faulty Transfer Case Range Actuator Position Sensor
Transfer Case Range Actuator Position Sensor harness is open or shorted
Transfer Case Range Actuator Position Sensor circuit poor electrical connection
Faulty Transfer Case Range Actuator Position Sensor (part of the Transfer Case Motor or Transfer Case Two/Four Wheel Drive Actuator)
Faulty Transfer Case Control Module

How to Fix the DTC C0398 2015 GMC Sierra?

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 C0398 2015 GMC Sierra 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 C0398 2015 GMC Sierra code?

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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 C0398 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code C0398 in a 2015 GMC Sierra?

- Common symptoms include erratic shifting behavior, transmission slippage, and the illumination of the Check Engine Light.

2. What does the OBDII code C0398 indicate in a 2015 GMC Sierra?

- The code C0398 indicates an issue with the Range Actuator Position - Range Position Correlation in the transmission system.

3. What are the possible causes of OBDII code C0398 in a 2015 GMC Sierra?

- Possible causes include a faulty range actuator, damaged wiring or connectors, low transmission fluid levels, or a malfunctioning transmission control module.

4. How can I diagnose the OBDII code C0398 in my 2015 GMC Sierra?

- Diagnosis typically involves using a scan tool to retrieve the code, checking the transmission fluid level and condition, inspecting wiring and connectors, and testing the range actuator for proper function.

5. Can I drive my 2015 GMC Sierra with the OBDII code C0398?

- It is not recommended to drive the vehicle with unresolved transmission issues as it can lead to further damage. It is best to address the underlying cause of the code promptly.

6. How can I repair OBDII code C0398 in my 2015 GMC Sierra?

- Repair steps may involve replacing a faulty range actuator, repairing damaged wiring or connectors, topping up transmission fluid, or reprogramming the transmission control module.

7. Is it safe to continue driving with the Check Engine Light on due to code C0398 in a 2015 GMC Sierra?

- It is advisable to have the issue diagnosed and repaired as soon as possible to prevent potential transmission damage or safety hazards while driving.

8. Can a DIY enthusiast fix OBDII code C0398 in a 2015 GMC Sierra?

- Depending on the skill level and tools available, some DIY enthusiasts may be able to address simpler causes like checking and topping up transmission fluid. However, more complex issues may require professional diagnosis and repair.

9. How much does it typically cost to repair OBDII code C0398 in a 2015 GMC Sierra?

- Repair costs can vary widely depending on the underlying cause of the code, parts needed for replacement, and labor rates. It is recommended to obtain estimates from reputable mechanics or service centers.

10. Will resetting the Check Engine Light resolve OBDII code C0398 in a 2015 GMC Sierra?

- Simply resetting the Check Engine Light will not resolve the underlying issue causing the code. It is essential to diagnose and fix the root cause to prevent the code from reoccurring.