AutoCodes – GMC – P251F 2016 GMC Sierra

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

Quick Answer

The Power Take-Off (PTO) is an upfitter integrated system that allows the user to create an auxiliary power source. Common causes include Faulty Power Take-Off (PTO) Control Module, Power Take-Off Control Module harness is open or shorted, Power Take-Off Control Module circuit poor electrical connection. 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 Power Take-Off (PTO) Control Module, Power Take-Off Control Module harness is open or shorted, Power Take-Off Control Module circuit poor electrical connection.
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.

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Code Popularity 150

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 Sep 21, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P251F 2016 GMC Sierra Description

The Power Take-Off (PTO) is an upfitter integrated system that allows the user to create an auxiliary power source. The PTO system specifically controls engine speed to values higher than normal base idle, PTO load relay engagement, and remote starting and shutdown of the engine. When the operator requests PTO using either the PTO switch or PTO remote, the engine RPM will increase to a default standby speed. The Engine Control Module (ECM) converts the data from the engine speed sensor to a 2 pulses/engine revolution signal. When PTO is engaged, the power take-off control module sends a serial data message to the ECM requesting engine speeds, in response to signals from the PTO switch or remote.
The Diagnostic Trouble Code (DTC) will be set when the Power Take-Off Control Module detects a fault on the PTO engine shutdown control circuit that is above or below a predetermined voltage threshold.

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

What does this mean?

What are the Possible Causes of the DTC P251F 2016 GMC Sierra?

Faulty Power Take-Off (PTO) Control Module
Power Take-Off Control Module harness is open or shorted
Power Take-Off Control Module circuit poor electrical connection

How to Fix the DTC P251F 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 P251F 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 P251F 2016 GMC Sierra code?

Need more information on how to fix the P251F 2016 GMC Sierra code? Get Access to Factory Service Manuals

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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.