P185F Chevrolet Code - Transfer Case Shift Pending Signal Not Plausible
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
- P185F Chevrolet indicates Transfer Case Shift Pending Signal Not Plausible.
- 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 P185F 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 P185F 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 P185F 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 P185F 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 P185F Chevrolet code?
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Information for Specific Chevrolet Models
- P185F 2014 Chevrolet Silverado — Transfer Case Shift Pending Signal Not Plausible
- P185F 2015 Chevrolet Silverado — Transfer Case Shift Pending Signal Not Plausible
- P185F 2016 Chevrolet Silverado — Transfer Case Shift Pending Signal Not Plausible
- P185F 2017 Chevrolet Silverado — Transfer Case Shift Pending Signal Not Plausible
- P185F 2018 Chevrolet Silverado — Transfer Case Shift Pending Signal Not Plausible
Frequently Asked Questions about P185F Chevrolet Code
What does the OBDII code P185F mean for a Chevrolet vehicle?
The code P185F indicates that the Transfer Case Shift Pending Signal is not plausible, suggesting a communication issue between the transfer case control module and other vehicle systems.
What are the common symptoms of a P185F code?
Common symptoms include difficulty shifting between drive modes (e.g., 2WD to 4WD), warning lights on the dashboard, unusual noises from the transfer case, and potential performance issues in varying road conditions.
What could cause the P185F code to trigger?
Possible causes include a faulty transfer case control module, wiring issues such as shorts or open circuits, a malfunctioning transfer case motor, or issues with the vehicle's battery or charging system.
How can I diagnose the P185F code?
To diagnose the P185F code, use a scan tool to read the code and any related codes, inspect the wiring and connectors for damage, check the transfer case motor operation, and verify the transfer case control module's functionality.
What are some common repair solutions for the P185F code?
Repairs can include fixing or replacing damaged wiring and connectors, replacing a faulty transfer case control module, servicing or replacing the transfer case motor, or reprogramming the control module if necessary.
Can I drive my vehicle if the P185F code is present?
While it may be possible to drive the vehicle, it is not recommended as it could lead to further issues with the transfer case and affect traction and stability in adverse conditions.
How do I reset the P185F code after repairs?
To reset the P185F code, you can clear it using an OBDII scan tool after completing necessary repairs. Additionally, disconnecting the vehicle's battery for a few minutes can also reset the code, though this may reset other system settings.
Is the P185F code specific to certain Chevrolet models?
The P185F code can occur in various Chevrolet models equipped with a transfer case, particularly those with four-wheel drive systems. It's essential to check the specific model and year for any particular quirks.
What should I do if the P185F code keeps returning?
If the P185F code keeps returning after repairs, further inspection may be necessary. This could involve checking for intermittent electrical issues, ensuring all related components are functioning correctly, or consulting a professional mechanic for a thorough diagnostic.
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