AutoCodes – GMC – P251F GMC

P251F GMC 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 GMC 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 326

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

What does this mean?

What are the Possible Causes of the DTC P251F GMC?

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 GMC?

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 GMC 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 GMC code?

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

Need Help with the Code?

Get the P251F GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P251F 2014 GMC Sierra — Power Take-Off Engine Shutdown Control Circuit High Voltage
P251F 2015 GMC Sierra — Power Take-Off Engine Shutdown Control Circuit High Voltage
P251F 2016 GMC Sierra — Power Take-Off Engine Shutdown Control Circuit High Voltage
P251F 2017 GMC Sierra — Power Take-Off Engine Shutdown Control Circuit High Voltage
P251F 2018 GMC Sierra — Power Take-Off Engine Shutdown Control Circuit High Voltage

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 GMC Code

1. What are the common symptoms of OBDII code P251F GMC?

When the Power Take-Off Engine Shutdown Control Circuit registers high voltage, common symptoms include the power take-off system not functioning properly, engine stalling or shutting down unexpectedly, and the Check Engine Light illuminating.

2. What are the possible causes of OBDII code P251F GMC?

The potential causes for the Power Take-Off Engine Shutdown Control Circuit high voltage issue include faulty power take-off control module, damaged wiring or connectors in the power take-off system, low battery voltage, or a malfunctioning power take-off switch.

3. How serious is OBDII code P251F GMC?

While this code may not pose an immediate threat to the vehicle's drivability, ignoring it can lead to issues with the power take-off system and potential engine shutdowns, making it essential to address the problem promptly.

4. Can OBDII code P251F GMC be diagnosed at home?

Diagnosing the Power Take-Off Engine Shutdown Control Circuit high voltage issue may require advanced diagnostic tools to pinpoint the exact cause accurately. It is recommended to seek professional assistance for a thorough diagnosis.

5. How is OBDII code P251F GMC typically repaired?

Repairing this code often involves inspecting and testing the power take-off control module, checking the wiring and connectors for any damage, verifying the power take-off switch functionality, and addressing any underlying issues to reset the code.

6. Can driving with OBDII code P251F GMC cause further damage?

Continuing to drive with the Power Take-Off Engine Shutdown Control Circuit high voltage issue can potentially lead to power take-off system failures, engine stalling incidents, or other related complications if left unresolved for an extended period.

7. Are there any DIY fixes for OBDII code P251F GMC?

DIY fixes for this code may include checking the power take-off system components for visible damage, ensuring proper connections, and inspecting the power take-off switch. However, complex diagnostics and repairs are best left to professionals.

8. How much does it cost to repair OBDII code P251F GMC?

The cost of repairing the Power Take-Off Engine Shutdown Control Circuit high voltage issue can vary depending on the underlying cause, parts needing replacement, labor costs, and whether the repair is done at a dealership or an independent repair shop.

9. Can resetting the OBDII code P251F GMC resolve the issue temporarily?

While clearing the code may temporarily turn off the Check Engine Light, it is crucial to address the root cause of the problem to prevent future occurrences of the Power Take-Off Engine Shutdown Control Circuit high voltage issue.

10. Is it safe to drive with OBDII code P251F GMC present?

Driving with the Power Take-Off Engine Shutdown Control Circuit high voltage issue may pose risks of power take-off system failures or engine shutdowns while on the road. It is advisable to have the problem diagnosed and repaired as soon as possible to ensure safe driving conditions.