AutoCodes – GMC – P251E GMC

P251E GMC Code - Power Take-Off Engine Shutdown Control Circuit Low 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: P251E GMC indicates Power Take-Off Engine Shutdown Control Circuit Low 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.

Save to My Repairs My Repairs

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

Code Popularity 306

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
Add Comment

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

Code P251E 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 P251E GMC - Power Take-Off Engine Shutdown Control Circuit Low Voltage - AutoCodes.com — P251E GMC Code - Power Take-Off Engine Shutdown Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P251E 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 P251E 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 P251E 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 P251E GMC code?

Need more information on how to fix the P251E GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P251E GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P251E 2014 GMC Sierra — Power Take-Off Engine Shutdown Control Circuit Low Voltage
P251E 2015 GMC Sierra — Power Take-Off Engine Shutdown Control Circuit Low Voltage
P251E 2016 GMC Sierra — Power Take-Off Engine Shutdown Control Circuit Low Voltage
P251E 2017 GMC Sierra — Power Take-Off Engine Shutdown Control Circuit Low Voltage
P251E 2018 GMC Sierra — Power Take-Off Engine Shutdown Control Circuit Low 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 P251E GMC Code

1. What are the common symptoms of OBDII code P251E GMC?

- Common symptoms include the power take-off (PTO) system not functioning properly, engine stalling during PTO operation, and the check engine light illuminating.

2. What can cause the OBDII code P251E GMC to trigger?

- This code is typically triggered by a low voltage condition in the power take-off engine shutdown control circuit.

3. How serious is the OBDII code P251E GMC?

- While it may not cause immediate harm to the vehicle, ignoring this code can lead to issues with the PTO system and potential engine stalling during operation.

4. How can I diagnose the cause of OBDII code P251E GMC?

- Diagnosing this code may involve checking the voltage in the shutdown control circuit, inspecting wiring for damage, and testing the PTO system components.

5. What are some repair tips for fixing OBDII code P251E GMC?

- Repair tips may include repairing or replacing damaged wiring, ensuring proper connections in the circuit, and testing the PTO system for proper operation.

6. Can I continue driving my vehicle with OBDII code P251E GMC?

- It is not recommended to continue driving the vehicle with this code present, as it can lead to potential PTO system malfunctions and engine stalling.

7. How much does it typically cost to repair OBDII code P251E GMC?

- The cost of repair can vary depending on the exact cause of the issue, but it may involve replacing wiring, fixing connections, or replacing PTO system components.

8. Can I clear OBDII code P251E GMC with a diagnostic tool?

- Yes, a diagnostic tool can be used to clear the code after the underlying issue has been diagnosed and repaired.

9. What is the power take-off (PTO) system in a vehicle?

- The PTO system allows a vehicle's engine power to be used to operate auxiliary equipment such as hydraulic pumps, winches, or generators.

10. How can I prevent OBDII code P251E GMC from recurring in the future?

- Regular maintenance checks, ensuring proper wiring connections, and addressing any issues with the PTO system promptly can help prevent this code from recurring.