AutoCodes – Buick – P17D4 Buick

P17D4 Buick Code - Transfer Case Neutral Range Detected in High or Low Range

Quick Answer

The Engine Control Module (ECM) uses the following two ways to determine if the transfer case is in 4WD Low, 4WD High, or Neutral. Common causes include Reprogram Engine Control Module (ECM), Faulty Engine Control Module, Engine Control Module harness is open or shorted. 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: P17D4 Buick indicates Transfer Case Neutral Range Detected in High or Low Range.
Common causes: Common causes include Reprogram Engine Control Module (ECM), Faulty Engine Control Module, Engine Control Module harness is open or shorted.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 541

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 Aug 29, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P17D4 Buick Description

The Engine Control Module (ECM) uses the following two ways to determine if the transfer case is in 4WD Low, 4WD High, or Neutral.
1. The first way is to compare the transmission output speed sensor to the transfer case output speed sensor in order to calculate the transfer case range.
2. The second way is to use a LAN message sent by the transfer case shift control module to the ECM.
The ECM uses this message to determine motor torque required and transmission shifting.
The internal fault detection is handled inside the control module. No external circuit diagnosis is involved.
If the first way and second way of determining transfer case range do not match while in 4WD Low, 4WD High or Neutral, then the Diagnostic Trouble Code (DTC) is set.

OBDII Code P17D4 Buick - Transfer Case Neutral Range Detected in High or Low Range - AutoCodes.com — P17D4 Buick Code - Transfer Case Neutral Range Detected in High or Low Range

What does this mean?

What are the Possible Causes of the DTC P17D4 Buick?

Reprogram Engine Control Module (ECM)
Faulty Engine Control Module
Engine Control Module harness is open or shorted
Engine Control Module circuit poor electrical connection
Transmission internal mechanical problems

How to Fix the DTC P17D4 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 P17D4 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.

Need more information about the P17D4 Buick code?

Need more information on how to fix the P17D4 Buick code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P17D4 Buick code diagnosed by a professional: Find a repair shop in your area

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 P17D4 Buick Code

1. What does the OBDII code P17D4 mean for a Buick?

P17D4 indicates that the transfer case control module has detected the neutral range inappropriately while the vehicle is in high or low range.

2. What are the common symptoms of code P17D4 on a Buick?

Symptoms may include the vehicle being stuck in neutral, inability to switch between 4WD modes, warning lights on the dashboard, and possible drivability issues.

3. What causes the P17D4 code to appear on a Buick?

Common causes include a malfunctioning transfer case control module, faulty shift motor, damaged wiring, or mechanical issues within the transfer case.

4. Can I drive my Buick with a P17D4 code?

Itâ€™s not recommended to drive with this code active, as it could lead to drivetrain damage or leave the vehicle unable to shift properly.

5. How do I fix the P17D4 code on my Buick?

Repairs may involve inspecting and repairing damaged wiring, replacing the transfer case shift motor, reprogramming or replacing the transfer case control module, or addressing internal transfer case issues.

6. Will clearing the P17D4 code fix the problem?

Clearing the code may temporarily remove the warning, but the underlying issue must be resolved to prevent the code from returning.

7. How much does it cost to repair a P17D4 code on a Buick?

Repair costs vary depending on the exact cause, but can range from $200 for wiring repairs to $1,500 or more for transfer case or module replacement.

8. How do mechanics diagnose the P17D4 code?

Mechanics use a scan tool to confirm the code, inspect wiring and connectors, test the transfer case shift motor, and check for mechanical issues in the transfer case.

9. Can a faulty transfer case switch trigger the P17D4 code?

Yes, a defective transfer case switch can send incorrect signals, leading to the detection of an improper neutral range and triggering the code.

10. What maintenance can help prevent a P17D4 code on a Buick?

Regularly inspecting and servicing the transfer case, keeping the 4WD system in good condition, and addressing any unusual noises early can help prevent this issue.