P185F 2015 GMC Sierra 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 2015 GMC Sierra 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 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 P185F 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 P185F 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 P185F 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.
Need more information about the P185F 2015 GMC Sierra code?
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Frequently Asked Questions about P185F 2015 GMC Sierra Code
1. What are the common symptoms of OBDII code P185F in a 2015 GMC Sierra?
- Common symptoms include difficulty shifting gears, erratic shifting behavior, and the illumination of the service 4WD light on the dashboard.
2. What does the OBDII code P185F, "Transfer Case Shift Pending Signal Not Plausible," mean in a 2015 GMC Sierra?
- This code indicates that the transfer case control module has detected an issue with the shift pending signal, suggesting a problem with the transfer case shifting process.
3. What are some possible causes of OBDII code P185F in a 2015 GMC Sierra?
- Possible causes include a faulty transfer case shift motor, damaged wiring or connectors, a malfunctioning transfer case control module, or issues with the transfer case itself.
4. How can I diagnose the OBDII code P185F in my 2015 GMC Sierra?
- Diagnosing this code typically involves using a diagnostic scan tool to retrieve the code, checking for any other related codes, inspecting the transfer case components, and testing the shift motor and signals.
5. What are some repair tips for resolving OBDII code P185F in a 2015 GMC Sierra?
- Repair tips may include checking and repairing any damaged wiring or connectors, replacing the transfer case shift motor if faulty, reprogramming the transfer case control module, or addressing any other underlying issues with the transfer case system.
6. Can I continue driving my 2015 GMC Sierra with OBDII code P185F present?
- It is not recommended to continue driving with this code present, as it can lead to further damage to the transfer case system and potentially affect the vehicle's drivability and safety.
7. How much does it typically cost to repair OBDII code P185F in a 2015 GMC Sierra?
- The cost of repair can vary depending on the specific cause of the issue, but it may involve expenses for parts replacement, labor, and diagnostic fees. It is advisable to consult a professional mechanic for an accurate estimate.
8. Is OBDII code P185F a common issue in 2015 GMC Sierra vehicles?
- While not extremely common, occurrences of this code have been reported in some 2015 GMC Sierra vehicles, particularly those that have experienced transfer case or shifting-related problems.
9. Can I reset the OBDII code P185F in my 2015 GMC Sierra by disconnecting the battery?
- While disconnecting the battery may clear the code temporarily, it is not a recommended long-term solution. It is best to address the underlying issue causing the code to prevent it from reoccurring.
10. Should I attempt to repair OBDII code P185F in my 2015 GMC Sierra myself, or seek professional help?
- Due to the complexity of the transfer case system and potential causes of this code, it is advisable to seek professional help from a qualified mechanic or dealership with experience in diagnosing and repairing transfer case issues.
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