AutoCodes – Buick – C0398 Buick

C0398 Buick 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 Buick 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 878

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

What does this mean?

What are the Possible Causes of the DTC C0398 Buick?

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 Buick?

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 Buick 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 C0398 Buick Code

1. What does the OBDII code C0398 mean on a Buick?

The C0398 code indicates an issue with the Range Actuator Position and Range Position Correlation, meaning the vehicle's computer cannot detect proper alignment between the actuator and the selected gear position.

2. What are common symptoms of the C0398 code on a Buick?

Symptoms may include the transmission not shifting properly, the gear indicator not matching the actual gear, reduced engine performance, or the Check Engine Light and/or Service Transmission warning appearing.

3. What causes the C0398 code to appear on a Buick?

Common causes include a faulty range actuator, misaligned shift linkage, a damaged range position sensor, corroded or damaged wiring, or a malfunctioning transmission control module (TCM).

4. Is it safe to drive a Buick with the C0398 code?

Driving with the C0398 code is not recommended as it can lead to erratic shifting, potential transmission damage, or unsafe driving conditions due to incorrect gear engagement.

5. How do you diagnose the C0398 code on a Buick?

Diagnosis involves using an OBDII scanner to confirm the code, inspecting the range actuator and position sensor for damage, checking the alignment of the shift linkage, and testing the wiring and connectors for continuity or corrosion.

6. Can the C0398 code be caused by a software issue?

Yes, in some cases, outdated or corrupted transmission control module (TCM) software can cause the C0398 code. A software update or reprogramming may resolve the issue.

7. How can the C0398 code on a Buick be fixed?

Repairs may include replacing the range actuator or position sensor, realigning the shift linkage, repairing or replacing damaged wiring, or updating the TCM software if needed.

8. What tools are needed to fix the C0398 code?

Basic tools include an OBDII scanner, multimeter for electrical testing, and potentially specialty tools for removing or adjusting transmission components.

9. How much does it cost to fix the C0398 code on a Buick?

Repair costs can vary widely depending on the underlying issue, ranging from $150 for minor sensor repairs to over $1,000 for actuator replacement or major transmission work.

10. Can a weak battery cause the C0398 code on a Buick?

While unlikely, a weak or failing battery can cause voltage irregularities that may interfere with the transmission control system, potentially triggering the code.