AutoCodes – Generic – P185F

P185F 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 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 4,539

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 29, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P185F Description

The Engine Control Module (ECM) uses the following two ways to determine if the transfer case is in 4WD Low, 4WD High, or Neutral.
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.

OBDII Code P185F - Transfer Case Shift Pending Signal Not Plausible - AutoCodes.com — P185F Code - Transfer Case Shift Pending Signal Not Plausible

What does this mean?

What are the Possible Causes of the DTC P185F?

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?

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 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 code?

Need more information on how to fix the P185F code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P185F code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P185F Buick — Transfer Case Shift Pending Signal Not Plausible
P185F Cadillac — Transfer Case Shift Pending Signal Not Plausible
P185F Chevrolet — Transfer Case Shift Pending Signal Not Plausible
P185F GMC — Transfer Case Shift Pending Signal Not Plausible

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P185F Code

What does OBDII code P185F mean?

Code P185F indicates a problem with the transfer case shift pending signal, specifically that the signal is not plausible or consistent with expected values.

What are the common symptoms of code P185F?

Symptoms may include illuminated check engine light, difficulty shifting the transfer case, unusual noises during shifting, or loss of four-wheel drive functionality.

What causes code P185F to be triggered?

The code can be triggered by issues such as a faulty transfer case control module, wiring problems, sensor failure, or mechanical damage in the transfer case.

Can driving with code P185F cause further damage?

Yes, driving with this code may lead to additional damage to the transfer case or drivetrain components if the issue is not addressed promptly.

How can I diagnose code P185F?

Diagnosing this code involves scanning for trouble codes, inspecting the transfer case wiring and connectors, testing the transfer case control module, and checking for mechanical issues in the transfer case.

Is code P185F specific to certain vehicles?

Code P185F is typically found in vehicles equipped with electronically controlled transfer cases, such as certain SUVs and trucks with four-wheel drive systems.

How do I fix code P185F?

Repairs may include replacing the transfer case control module, fixing damaged wiring or connectors, recalibrating the transfer case, or addressing mechanical issues inside the transfer case.

Do I need a mechanic to fix code P185F?

While some basic checks can be done at home, diagnosing and repairing transfer case issues often requires specialized tools and expertise, so consulting a qualified mechanic is recommended.

Will clearing the code resolve P185F?

Clearing the code without fixing the underlying issue will not resolve the problem and may cause the code to return.

How much does it cost to repair code P185F?

Repair costs vary depending on the root cause but may range from $100 for simple wiring fixes to over $1,000 for transfer case control module replacement or mechanical repairs.