P17D4 Chevrolet 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 Chevrolet 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 Chevrolet 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 Chevrolet?
- 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 Chevrolet?
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 Chevrolet 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 Chevrolet code?
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Information for Specific Chevrolet Models
- P17D4 2014 Chevrolet Silverado — Transfer Case Neutral Range Detected in High or Low Range
- P17D4 2015 Chevrolet Silverado — Transfer Case Neutral Range Detected in High or Low Range
- P17D4 2016 Chevrolet Silverado — Transfer Case Neutral Range Detected in High or Low Range
- P17D4 2017 Chevrolet Silverado — Transfer Case Neutral Range Detected in High or Low Range
- P17D4 2018 Chevrolet Silverado — Transfer Case Neutral Range Detected in High or Low Range
Frequently Asked Questions about P17D4 Chevrolet Code
1. What does the OBDII code P17D4 mean in a Chevrolet?
P17D4 indicates that the transfer case has detected the neutral range while the system is in high or low range, which is an abnormal condition.
2. What are the common symptoms of code P17D4 in a Chevrolet?
Common symptoms include the vehicle being stuck in neutral, the inability to shift into 4WD modes, warning lights on the dashboard, and abnormal transfer case operation.
3. What causes the P17D4 code in a Chevrolet?
Possible causes include a faulty transfer case control module, damaged transfer case motor, wiring or connector issues, or mechanical failure in the transfer case.
4. Can I drive my Chevrolet with a P17D4 code?
Driving may not be possible if the vehicle is stuck in neutral. If drivable, it’s not recommended to continue driving as it could cause further damage.
5. How is the P17D4 code diagnosed in a Chevrolet?
Technicians typically use a scan tool to confirm the code, inspect the transfer case motor and control module, check wiring and connectors, and test for mechanical issues in the transfer case.
6. What repairs can fix the P17D4 code in a Chevrolet?
Repairs may involve replacing the transfer case motor, repairing or replacing wiring, reprogramming or replacing the transfer case control module, or addressing mechanical damage in the transfer case.
7. How much does it cost to fix the P17D4 code in a Chevrolet?
Costs vary by the cause of the issue, but replacement of the transfer case motor or control module typically ranges from $300 to $1,000, including parts and labor.
8. Can a software glitch cause the P17D4 code?
Yes, a software issue in the transfer case control module can trigger this code. Updating or reprogramming the module may resolve the problem.
9. How can I prevent the P17D4 code from occurring in the future?
Regular maintenance of the transfer case, inspecting wiring and connectors, and avoiding harsh or improper use of 4WD modes can help prevent this issue.
10. Does the P17D4 code require specialized tools to repair?
Yes, diagnosing and repairing this code often requires a professional scan tool and specialized knowledge of the transfer case system.
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