P17D4 GMC 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 GMC 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.
Code P17D4 GMC Description
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.
What are the Possible Causes of the DTC P17D4 GMC?
- 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 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 P17D4 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 P17D4 GMC code?
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Need Help with the Code?
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Information for Specific GMC Models
- P17D4 2014 GMC Sierra — Transfer Case Neutral Range Detected in High or Low Range
- P17D4 2015 GMC Sierra — Transfer Case Neutral Range Detected in High or Low Range
- P17D4 2016 GMC Sierra — Transfer Case Neutral Range Detected in High or Low Range
- P17D4 2017 GMC Sierra — Transfer Case Neutral Range Detected in High or Low Range
- P17D4 2018 GMC Sierra — Transfer Case Neutral Range Detected in High or Low Range
Frequently Asked Questions about P17D4 GMC Code
1. What are the common symptoms of OBDII code P17D4 GMC (Transfer Case Neutral Range Detected in High or Low Range)?
- Common symptoms include difficulty shifting gears, the vehicle getting stuck in one gear, and the service 4WD light illuminating on the dashboard.
2. What can cause the OBDII code P17D4 GMC to appear?
- This code can be triggered by issues such as a faulty transfer case control module, damaged wiring, or a malfunctioning transfer case shift motor.
3. How serious is the P17D4 GMC code related to Transfer Case Neutral Range Detected in High or Low Range?
- This code can affect the drivability of the vehicle and may result in improper gear engagement, so it is important to address the issue promptly.
4. Can I continue driving my vehicle with the P17D4 GMC code present?
- It is not recommended to continue driving the vehicle with this code active, as it may lead to further damage to the transfer case components.
5. How can I diagnose and repair the P17D4 GMC code?
- Diagnosis typically involves inspecting the transfer case components, checking for damaged wiring, and using a scan tool to retrieve specific diagnostic codes. Repair may involve replacing the transfer case control module or repairing/replacing damaged wiring.
6. Is it possible to reset the OBDII code P17D4 GMC without fixing the underlying issue?
- While clearing the code may temporarily turn off the warning light, the underlying issue causing the code will persist until properly diagnosed and repaired.
7. Will the P17D4 GMC code cause my vehicle to go into limp mode?
- Depending on the severity of the issue, the vehicle may go into a limited operation mode to prevent further damage. It is advisable to address the problem promptly to avoid this.
8. Can weather conditions affect the appearance of the P17D4 GMC code?
- Extreme weather conditions, such as extreme cold or heat, can sometimes exacerbate issues related to the transfer case, potentially leading to the appearance of this code.
9. How long does it typically take to repair the P17D4 GMC code?
- The repair time can vary depending on the exact cause of the issue and the availability of parts. It is recommended to consult a professional mechanic for an accurate estimate.
10. Are there any preventive maintenance tips to avoid encountering the P17D4 GMC code?
- Regularly inspecting and maintaining the transfer case components, including checking for leaks and ensuring proper fluid levels, can help prevent issues that may trigger this code.
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