P185F 2017 Chevrolet Silverado 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 2017 Chevrolet Silverado 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 2017 Chevrolet Silverado 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 2017 Chevrolet Silverado?
- 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 2017 Chevrolet Silverado?
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 2017 Chevrolet Silverado 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 2017 Chevrolet Silverado code?
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Frequently Asked Questions about P185F 2017 Chevrolet Silverado Code
1. What does the OBDII code P185F mean on a 2017 Chevrolet Silverado?
The P185F code indicates a "Transfer Case Shift Pending Signal Not Plausible," meaning the transfer case control module has detected an issue with the shift signal.
2. What are common symptoms of the P185F code in a Chevrolet Silverado?
Symptoms may include the 4WD system not engaging properly, dashboard warning lights (like the Service 4WD light), or the inability to switch between 4WD and 2WD modes.
3. What causes the P185F code to appear in a 2017 Chevrolet Silverado?
Common causes include faulty transfer case shift motor, wiring or connection issues, a malfunctioning transfer case control module, or software glitches.
4. How can I diagnose the P185F code in my Chevrolet Silverado?
Start by using a diagnostic scanner to confirm the code, then inspect the transfer case wiring, connectors, and shift motor. Check for any physical damage or corrosion.
5. Is the P185F code serious for my Silverado?
While it may not immediately affect drivability, unresolved issues with the transfer case can lead to further damage or leave the vehicle stuck in an undesirable drive mode.
6. Can I fix the P185F code myself?
If you're experienced with vehicle repairs, you can inspect and replace faulty wiring or connectors. However, more complex repairs like replacing the shift motor or control module may require professional assistance.
7. How much does it cost to repair the P185F code on a Chevrolet Silverado?
Repair costs vary but may range from $200 to $700 depending on whether the issue is with the shift motor, wiring, or transfer case control module.
8. Can a software update fix the P185F code?
In some cases, a software update for the transfer case control module may resolve the issue. Check with your dealer or mechanic to see if an update is available.
9. Will clearing the P185F code fix the problem?
Clearing the code may temporarily remove the warning, but if the underlying issue is not addressed, it will likely return.
10. What preventive measures can I take to avoid the P185F code?
Regularly inspect and maintain the transfer case system, including the wiring and connectors, and ensure the software is up to date. Avoid excessive strain on the 4WD system to reduce wear.
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