P17D4 2018 GMC Sierra 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 2018 GMC Sierra 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 2018 GMC Sierra 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 2018 GMC Sierra?
- 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 2018 GMC Sierra?
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 2018 GMC Sierra 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 2018 GMC Sierra code?
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Frequently Asked Questions about P17D4 2018 GMC Sierra Code
1. What are the common symptoms of OBDII code P17D4 in a 2018 GMC Sierra?
The common symptoms include the vehicle being unable to shift out of neutral, the transfer case being stuck in high or low range, and dashboard warning lights illuminating.
2. What could be the possible causes of OBDII code P17D4 in a 2018 GMC Sierra?
Possible causes include faulty transfer case sensors, wiring issues, damaged transfer case components, or a malfunctioning transfer case control module.
3. How serious is the OBDII code P17D4 in a 2018 GMC Sierra?
This code indicates a problem with the transfer case, which can affect the drivability and safety of the vehicle. It is recommended to address this issue promptly.
4. Can I continue driving my 2018 GMC Sierra with OBDII code P17D4?
It is not advisable to continue driving the vehicle with this code present, as it may lead to further damage to the transfer case components.
5. How can I diagnose and repair OBDII code P17D4 in my 2018 GMC Sierra?
Diagnosis typically involves a thorough inspection of the transfer case components, sensors, and wiring. Repair may involve replacing faulty parts, repairing wiring issues, or reprogramming the transfer case control module.
6. Is it possible to reset OBDII code P17D4 in a 2018 GMC Sierra without fixing the underlying issue?
While you can clear the code temporarily, it is crucial to address the root cause of the problem to prevent the code from reoccurring.
7. Can weather conditions impact the occurrence of OBDII code P17D4 in a 2018 GMC Sierra?
Extreme weather conditions or water exposure can potentially affect the transfer case components and sensors, leading to the code being triggered.
8. How can I prevent OBDII code P17D4 from appearing in my 2018 GMC Sierra?
Regular maintenance of the transfer case system, checking for any signs of wear or damage, and addressing any issues promptly can help prevent this code from appearing.
9. Are there any recalls or technical service bulletins related to OBDII code P17D4 in a 2018 GMC Sierra?
It is recommended to check with the manufacturer or authorized service centers for any recalls or technical service bulletins related to this specific OBDII code in your vehicle.
10. Can a DIY enthusiast tackle the repair of OBDII code P17D4 in a 2018 GMC Sierra?
Depending on the level of expertise and access to tools, some DIY enthusiasts may be able to diagnose and repair simpler issues related to this code. However, complex problems may require professional assistance.
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