AutoCodes – GMC – C0398 GMC

C0398 GMC 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 GMC 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 7,973

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

What does this mean?

What are the Possible Causes of the DTC C0398 GMC?

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 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C0398 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.

Need more information about the C0398 GMC code?

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Need Help with the Code?

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Information for Specific GMC Models

C0398 2014 GMC Sierra — Range Actuator Position - Range Position Correlation
C0398 2015 GMC Sierra — Range Actuator Position - Range Position Correlation
C0398 2016 GMC Sierra — Range Actuator Position - Range Position Correlation
C0398 2017 GMC Sierra — Range Actuator Position - Range Position Correlation
C0398 2018 GMC Sierra — Range Actuator Position - Range Position Correlation

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 GMC Code

1. What are the common symptoms of OBDII code C0398 GMC?

- The common symptoms include erratic shifting, hesitation or jerking during acceleration, and the transmission staying in one gear.

2. What does the OBDII code C0398 GMC indicate?

- This code indicates a Range Actuator Position - Range Position Correlation problem in the transmission system.

3. What are the potential causes of OBDII code C0398 GMC?

- Possible causes include a faulty range actuator, damaged wiring or connectors in the transmission system, or internal transmission issues.

4. How can I diagnose the cause of OBDII code C0398 GMC?

- Diagnosing this code typically involves using a scan tool to check for related trouble codes, conducting a visual inspection of the transmission components, and performing tests on the range actuator.

5. Can I continue driving with OBDII code C0398 GMC present?

- It is not recommended to continue driving with this code present as it can lead to further transmission damage and potential safety risks.

6. How can I repair OBDII code C0398 GMC?

- Repairing this code may involve replacing the faulty range actuator, repairing damaged wiring or connectors, or addressing any internal transmission issues identified during diagnosis.

7. Is it possible to reset OBDII code C0398 GMC without repairing the issue?

- While clearing the code may temporarily turn off the check engine light, the underlying problem will persist and may lead to further complications if left unaddressed.

8. How much does it cost to fix OBDII code C0398 GMC?

- The cost of fixing this code can vary depending on the specific issue causing it, the parts needed for repair, and labor costs. It is advisable to consult a professional mechanic for an accurate estimate.

9. Can OBDII code C0398 GMC be prevented?

- Regular maintenance of the transmission system, including fluid checks and replacements, can help prevent issues that may trigger this code. Additionally, addressing any transmission-related symptoms promptly can prevent further damage.

10. Is OBDII code C0398 GMC a common issue in GMC vehicles?

- While not extremely common, this code can occur in GMC vehicles with transmission system malfunctions or sensor failures. Regular maintenance and prompt repairs can help prevent it from happening.