P17D4 2015 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 2015 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 2015 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 2015 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 2015 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 2015 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.
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Frequently Asked Questions about P17D4 2015 GMC Sierra Code
1. What does the OBDII code P17D4 mean on a 2015 GMC Sierra?
P17D4 indicates that the transfer case has detected a neutral range position while the vehicle is supposed to be in high or low range.
2. What are the common symptoms of a P17D4 code on a 2015 GMC Sierra?
Typical symptoms include the vehicle being unable to shift into or out of 4WD modes, the transfer case stuck in neutral, or warning lights on the dashboard like the service 4WD light.
3. What causes the P17D4 code to appear on a 2015 GMC Sierra?
Common causes include a faulty transfer case shift motor, wiring issues in the transfer case circuit, or problems with the transfer case control module.
4. Can driving with a P17D4 code cause damage to my GMC Sierra?
Yes, driving with the transfer case in neutral or improperly engaged can lead to drivetrain damage or loss of power to the wheels, creating a safety risk.
5. How can I fix a P17D4 code on my 2015 GMC Sierra?
Repairs may involve inspecting and replacing the transfer case shift motor, repairing damaged wiring, or reprogramming or replacing the transfer case control module.
6. Can a weak battery cause the P17D4 code on a 2015 GMC Sierra?
Yes, a weak or failing battery can cause improper voltage to the transfer case control module, which may trigger the P17D4 code.
7. How much does it cost to repair the P17D4 code on a 2015 GMC Sierra?
Repair costs can vary but typically range from $200 to $800, depending on whether the transfer case shift motor, wiring, or control module needs replacement.
8. Can I reset the P17D4 code without fixing the problem?
While you can clear the code with an OBDII scanner, the issue will likely return unless the underlying problem is resolved.
9. Does the P17D4 code indicate a problem with the transfer case itself?
Not necessarily. While it could indicate an internal transfer case issue, it’s more often related to the shift motor, control module, or wiring.
10. How do I diagnose the P17D4 code on a 2015 GMC Sierra?
Start by using an OBDII scanner to confirm the code, then inspect the transfer case wiring, shift motor, and control module for damage, and test their functionality.
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