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P251F 2016 GMC Sierra Code - Power Take-Off Engine Shutdown Control Circuit High Voltage

Quick Answer

The P251F diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a problem with the Power Take-Off (PTO) Engine Shutdown Control Circuit having high voltage. Common causes include Faulty PTO Engine Shutdown Control Circuit relay, Wiring issues such as shorts or open circuits in the PTO system, Corrosion or poor connections in the PTO system components. 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
P251F 2016 GMC Sierra indicates Power Take-Off Engine Shutdown Control Circuit High Voltage.
Common causes
Common causes include Faulty PTO Engine Shutdown Control Circuit relay, Wiring issues such as shorts or open circuits in the PTO system, Corrosion or poor connections in the PTO system components.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code P251F 2016 GMC Sierra Description

The P251F diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a problem with the Power Take-Off (PTO) Engine Shutdown Control Circuit having high voltage. The PTO system in a vehicle is responsible for controlling the engagement and disengagement of the power take-off unit, which is used to power auxiliary equipment like hydraulic pumps, generators, or winches. When the engine is shut down, the PTO system should also disengage to prevent any damage or excessive wear to the system.

OBDII Code P251F 2016 GMC Sierra - Power Take-Off Engine Shutdown Control Circuit High Voltage
P251F 2016 GMC Sierra Code - Power Take-Off Engine Shutdown Control Circuit High Voltage

Common Causes of P251F 2016 GMC Sierra

  1. Faulty PTO Engine Shutdown Control Circuit relay.
  2. Wiring issues such as shorts or open circuits in the PTO system.
  3. Corrosion or poor connections in the PTO system components.
  4. Malfunctioning PTO control module.
  5. System software or calibration issues.

Symptoms of P251F 2016 GMC Sierra

  1. Check Engine Light illuminated on the dashboard.
  2. PTO system fails to disengage when the engine is shut down.
  3. Increased fuel consumption due to the PTO system running continuously.
  4. Unusual noises or vibrations coming from the PTO system.

How to Fix P251F 2016 GMC Sierra

  1. Begin by conducting a thorough visual inspection of the PTO system components, wiring, and connectors.
  2. Use a multimeter to test the voltage levels in the Engine Shutdown Control Circuit to identify any irregularities.
  3. Check the PTO Engine Shutdown Control Circuit relay and replace if necessary.
  4. Inspect and repair any damaged or corroded wiring in the PTO system.
  5. If the issue persists, consider reprogramming or replacing the PTO control module.

Cost to Fix P251F 2016 GMC Sierra

The typical repair costs for addressing a P251F code on a 2016 GMC Sierra can vary depending on the specific cause of the issue. On average, the parts and labor for this repair could range from $200 to $500. However, it is important to note that diagnostic time and labor rates at auto repair shops can vary significantly based on factors such as location, vehicle make and model, and engine type. It is recommended to consult with a reputable mechanic or dealership to get an accurate estimate for this repair.

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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 P251F 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code P251F in a 2016 GMC Sierra?

The common symptoms of code P251F include the engine shutting down unexpectedly, reduced power output, and an illuminated Check Engine light.

2. What does the OBDII code P251F indicate in a 2016 GMC Sierra?

Code P251F indicates a problem with the Power Take-Off (PTO) Engine Shutdown Control Circuit, specifically high voltage detected.

3. What are the possible causes of OBDII code P251F in a 2016 GMC Sierra?

Possible causes of code P251F include a faulty PTO switch, damaged wiring or connectors in the circuit, a malfunctioning PTO control module, or a problem with the powertrain control module (PCM).

4. How can I diagnose the OBDII code P251F in my 2016 GMC Sierra?

Diagnosing code P251F involves checking the PTO circuit for any visible damage, testing the PTO switch and control module, and using a scan tool to retrieve additional fault codes and data.

5. Can I continue driving my 2016 GMC Sierra with OBDII code P251F?

It is not recommended to drive your vehicle with code P251F, as it may lead to further damage or safety concerns due to unexpected engine shutdowns.

6. How can I repair OBDII code P251F in my 2016 GMC Sierra?

To repair code P251F, you may need to replace the faulty PTO switch, repair any damaged wiring or connectors, replace the PTO control module if necessary, and clear the code with a scan tool.

7. Is OBDII code P251F in a 2016 GMC Sierra a common issue?

While not as common as some other OBDII codes, P251F can occur in vehicles equipped with a Power Take-Off system, such as certain GMC Sierra models.

8. Can a DIY enthusiast fix OBDII code P251F in a 2016 GMC Sierra?

Depending on your skill level and access to tools, a DIY enthusiast may be able to diagnose and repair code P251F by following the vehicle's service manual or seeking assistance from online resources.

9. How much does it cost to repair OBDII code P251F in a 2016 GMC Sierra?

The cost to repair code P251F can vary depending on the exact cause of the issue, the need for replacement parts, and whether you choose to perform the repair yourself or take your vehicle to a professional mechanic.

10. Will resetting the Check Engine light resolve OBDII code P251F in my 2016 GMC Sierra?

Resetting the Check Engine light may temporarily turn it off, but it will not fix the underlying issue causing code P251F. It's essential to diagnose and repair the problem to prevent further issues.

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