AutoCodes – GMC – P251A 2014 GMC Sierra

P251A 2014 GMC Sierra Code - Power Take-Off Enable Switch Circuit

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) Enable Switch, Power Take Off Enable Switch harness is open or shorted, Power Take Off Enable Switch 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: P251A 2014 GMC Sierra indicates Power Take-Off Enable Switch Circuit.
Common causes: Common causes include Faulty Power Take Off (PTO) Enable Switch, Power Take Off Enable Switch harness is open or shorted, Power Take Off Enable Switch 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 160

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 P251A 2014 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 enable switch circuit that is above or below a predetermined voltage threshold.

OBDII Code P251A 2014 GMC Sierra - Power Take-Off Enable Switch Circuit - AutoCodes.com — P251A 2014 GMC Sierra Code - Power Take-Off Enable Switch Circuit

What does this mean?

What are the Possible Causes of the DTC P251A 2014 GMC Sierra?

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

How to Fix the DTC P251A 2014 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 P251A 2014 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 P251A 2014 GMC Sierra code?

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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 P251A 2014 GMC Sierra Code

1. What does OBDII code P251A mean for a 2014 GMC Sierra?

The P251A code indicates a problem with the Power Take-Off Enable Switch Circuit in the vehicle.

2. What are the common symptoms of OBDII code P251A in a 2014 GMC Sierra?

Common symptoms of this code may include the inability to engage the Power Take-Off (PTO) system, the PTO system turning on unexpectedly, or the PTO system not turning off when commanded.

3. What are possible causes of OBDII code P251A in a 2014 GMC Sierra?

Potential causes of code P251A can include a faulty PTO enable switch, damaged wiring or connectors in the PTO circuit, or a malfunctioning PTO control module.

4. How can I diagnose OBDII code P251A in my 2014 GMC Sierra?

Diagnosing code P251A involves inspecting the PTO enable switch, checking the wiring and connectors for damage, and using a diagnostic scanner to retrieve trouble codes and data from the PTO control module.

5. Can I still drive my 2014 GMC Sierra with OBDII code P251A?

It is not recommended to drive the vehicle with an active P251A code, as it may affect the proper functioning of the PTO system and potentially lead to further issues.

6. How can I repair OBDII code P251A in my 2014 GMC Sierra?

Repairing code P251A may involve replacing the PTO enable switch, repairing damaged wiring or connectors, or reprogramming the PTO control module as necessary.

7. Is OBDII code P251A a serious issue in a 2014 GMC Sierra?

While code P251A may not directly impact the drivability of the vehicle, it is still important to address this issue promptly to ensure the proper functioning of the PTO system and prevent any potential safety hazards.

8. How much does it typically cost to fix OBDII code P251A in a 2014 GMC Sierra?

The cost of repairing code P251A can vary depending on the specific cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

9. Can I reset OBDII code P251A in my 2014 GMC Sierra without repairs?

While you can clear the trouble code using an OBDII scanner, it is not recommended to do so without addressing the underlying issue, as the code is likely to return if the problem persists.

10. Are there any preventive measures to avoid OBDII code P251A in a 2014 GMC Sierra?

To prevent code P251A, it's essential to perform regular maintenance checks on the PTO system, including inspecting the enable switch, wiring, and connectors for any signs of wear or damage.