P185F GMC 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 GMC 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 GMC 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 GMC?
- 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 GMC?
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 GMC 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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Information for Specific GMC Models
- P185F 2014 GMC Sierra — Transfer Case Shift Pending Signal Not Plausible
- P185F 2015 GMC Sierra — Transfer Case Shift Pending Signal Not Plausible
- P185F 2016 GMC Sierra — Transfer Case Shift Pending Signal Not Plausible
- P185F 2017 GMC Sierra — Transfer Case Shift Pending Signal Not Plausible
- P185F 2018 GMC Sierra — Transfer Case Shift Pending Signal Not Plausible
Frequently Asked Questions about P185F GMC Code
1. What are the common symptoms of OBDII code P185F GMC?
- Common symptoms include difficulty shifting the transfer case, the transfer case getting stuck in a particular mode, and warning lights illuminating on the dashboard.
2. What can cause the OBDII code P185F GMC to trigger?
- The code P185F GMC typically triggers due to issues with the transfer case shift control module, faulty wiring or connectors, or a malfunction in the transfer case actuator.
3. How serious is the OBDII code P185F GMC?
- The code P185F GMC can affect the proper functioning of the transfer case, leading to potential drivability issues. It is recommended to address this code promptly to prevent further damage.
4. Can I continue driving my vehicle with the OBDII code P185F GMC?
- It is not advisable to continue driving the vehicle with the code P185F GMC present, as it can lead to further damage to the transfer case system.
5. What are some DIY repair tips for OBDII code P185F GMC?
- DIY repair tips include checking and tightening any loose wiring connections, inspecting the transfer case shift control module for signs of damage, and ensuring all components are securely in place.
6. How can I diagnose the OBDII code P185F GMC?
- Diagnosis of the code P185F GMC involves using a scan tool to retrieve the fault codes, conducting a visual inspection of the transfer case components, and performing tests on the transfer case shift control module.
7. Is it necessary to reset the OBDII code P185F GMC after making repairs?
- Yes, it is essential to reset the code P185F GMC after making any repairs to clear the fault code from the vehicle's memory and verify if the issue has been resolved.
8. Can extreme weather conditions contribute to triggering the OBDII code P185F GMC?
- Yes, extreme temperature changes or harsh driving conditions can sometimes contribute to triggering the code P185F GMC due to the strain they put on the transfer case components.
9. How much does it typically cost to repair the OBDII code P185F GMC?
- The cost of repairing the code P185F GMC can vary depending on the root cause of the issue, but it may involve expenses for parts replacement, labor, and potential diagnostic fees.
10. Are there any recalls or technical service bulletins related to the OBDII code P185F GMC?
- It is advisable to check with the manufacturer or authorized service centers for any recalls or technical service bulletins related to the OBDII code P185F GMC to see if your vehicle is eligible for any repair assistance.
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