P185F 2016 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 2016 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 2016 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 2016 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 2016 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 2016 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 2016 GMC Sierra code?
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Frequently Asked Questions about P185F 2016 GMC Sierra Code
1. What does the OBDII code P185F mean for a 2016 GMC Sierra?
The P185F code indicates an issue where the transfer case shift pending signal is detected as not plausible, suggesting a communication or mechanical fault in the transfer case system.
2. What are the common symptoms of the P185F code in a 2016 GMC Sierra?
Symptoms can include the "Service 4WD" light illuminating, failure to shift between 2WD and 4WD modes, and unusual noises or delays when engaging the transfer case.
3. What causes the P185F code to trigger in a GMC Sierra?
The code can be caused by a faulty transfer case shift motor, wiring or connector issues, a malfunctioning transfer case control module (TCCM), or software-related errors.
4. Can the P185F code affect drivability in the GMC Sierra?
Yes, it may affect drivability in 4WD modes, potentially preventing proper engagement or disengagement of the transfer case and limiting off-road or adverse condition performance.
5. How is the P185F code diagnosed?
A technician will use a scan tool to verify the code, inspect wiring and connectors for damage, test the transfer case shift motor, and check for software updates or TCCM faults.
6. Can I still drive my 2016 GMC Sierra with the P185F code?
You can likely drive in 2WD mode, but using 4WD may be unreliable or unavailable. It’s best to address the issue promptly to avoid further damage.
7. How can I fix the P185F code on my GMC Sierra?
Repairs may include replacing the transfer case shift motor, repairing damaged wiring, updating TCCM software, or replacing the TCCM if it’s faulty.
8. How much does it cost to repair the P185F code on a 2016 GMC Sierra?
Repair costs vary, but replacing the transfer case shift motor may cost $300–$700, while TCCM replacement or wiring repairs can add to the expense.
9. Can a software update fix the P185F code on my GMC Sierra?
In some cases, a software update for the TCCM may resolve the issue if it’s related to incorrect signal processing or outdated programming.
10. What preventative maintenance can help avoid the P185F code?
Regularly inspect and clean transfer case system wiring and connectors, ensure proper lubrication in the transfer case, and keep TCCM software up to date.
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