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Engine-Codes – GMC – C0398 2018 GMC Sierra

C0398 2018 GMC Sierra Code - Range Actuator Position - Range Position Correlation

Quick Answer

The C0398 diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the Range Actuator Position - Range Position Correlation. Common causes include Malfunctioning range actuator, Faulty sensor or wiring related to the actuator, Communication error between the actuator and the vehicle's computer system. 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 2018 GMC Sierra indicates Range Actuator Position - Range Position Correlation.
Common causes
Common causes include Malfunctioning range actuator, Faulty sensor or wiring related to the actuator, Communication error between the actuator and the vehicle's computer system.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 14, 2024
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Code C0398 2018 GMC Sierra Description

The C0398 diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the Range Actuator Position - Range Position Correlation. This code indicates that there is a discrepancy between the actual position of the range actuator and the expected position based on the vehicle's computer system. The range actuator is responsible for controlling the position of the range selector in the transmission, which is crucial for proper gear selection and shifting.

OBDII Code C0398 2018 GMC Sierra - Range Actuator Position - Range Position Correlation
C0398 2018 GMC Sierra Code - Range Actuator Position - Range Position Correlation

Common Causes of C0398 2018 GMC Sierra

  1. Malfunctioning range actuator
  2. Faulty sensor or wiring related to the actuator
  3. Communication error between the actuator and the vehicle's computer system
  4. Electrical issues in the transmission control module
  5. Wear and tear on transmission components

Symptoms of C0398 2018 GMC Sierra

  1. Rough or erratic shifting
  2. Delayed or hesitant gear engagement
  3. Transmission slipping
  4. Reduced fuel efficiency
  5. Illumination of the Check Engine Light

How to Fix C0398 2018 GMC Sierra

  1. Perform a thorough diagnostic scan to retrieve the specific trouble codes and pinpoint the issue.
  2. Inspect the range actuator, sensors, and wiring for any signs of damage or malfunction.
  3. Test the communication between the actuator and the vehicle's computer system.
  4. Replace the faulty range actuator, sensor, or wiring as needed.
  5. Clear the trouble codes, reset the transmission adaptations, and test drive the vehicle to ensure proper operation.

Cost to Fix C0398 2018 GMC Sierra

The typical repair costs for addressing a C0398 code on a 2018 GMC Sierra can vary depending on the specific cause of the issue and the labor rates in your area. On average, you can expect to pay between $300 and $800 for parts and labor. Keep in mind that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate. Additionally, rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more competitive pricing.

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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 2018 GMC Sierra Code

1. What does OBDII code C0398 for a 2018 GMC Sierra mean?

- This code indicates a Range Actuator Position - Range Position Correlation issue in the vehicle's transmission system.

2. What are the common symptoms of OBDII code C0398 in a 2018 GMC Sierra?

- Common symptoms include rough shifting, poor acceleration, transmission slipping, and possible stalling.

3. What are the possible causes of OBDII code C0398 in a 2018 GMC Sierra?

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

4. How can I diagnose OBDII code C0398 in my 2018 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 performing tests on the range actuator.

5. What repairs are typically needed for OBDII code C0398 in a 2018 GMC Sierra?

- Repairs may involve replacing the range actuator, repairing or replacing damaged wiring or connectors, ensuring proper transmission fluid levels, or reprogramming the transmission control module.

6. Can I drive my 2018 GMC Sierra with OBDII code C0398?

- It is not recommended to drive the vehicle with this code, as it can lead to further transmission damage and safety hazards. Seek professional help to diagnose and repair the issue.

7. How much does it cost to fix OBDII code C0398 in a 2018 GMC Sierra?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

8. Can OBDII code C0398 in a 2018 GMC Sierra cause other problems if left unresolved?

- Yes, ignoring this code can lead to more serious transmission issues, increased fuel consumption, and potential safety risks while driving.

9. Is OBDII code C0398 a common problem in 2018 GMC Sierra vehicles?

- While it may not be extremely common, this code can still occur in 2018 GMC Sierra models due to various factors affecting the transmission system.

10. How can I prevent OBDII code C0398 from appearing in my 2018 GMC Sierra in the future?

- Regular maintenance, timely transmission fluid changes, and addressing any warning signs promptly can help prevent issues like C0398 from occurring in your vehicle.

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