AutoCodes – GMC – P251A 2017 GMC Sierra

P251A 2017 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 2017 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 186

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 2017 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 2017 GMC Sierra - Power Take-Off Enable Switch Circuit - AutoCodes.com — P251A 2017 GMC Sierra Code - Power Take-Off Enable Switch Circuit

What does this mean?

What are the Possible Causes of the DTC P251A 2017 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 2017 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 2017 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.

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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 2017 GMC Sierra Code

1. What does OBDII code P251A mean for a 2017 GMC Sierra?

- OBDII code P251A indicates a problem with the Power Take-Off Enable Switch Circuit in a 2017 GMC Sierra.

2. What are the common symptoms of OBDII code P251A in a 2017 GMC Sierra?

- Common symptoms of P251A may include difficulty engaging the power take-off (PTO) system, a disabled PTO system, and an illuminated check engine light.

3. What are the possible causes of OBDII code P251A in a 2017 GMC Sierra?

- Potential causes of P251A include a faulty power take-off enable switch, damaged wiring or connectors in the circuit, or a malfunctioning PTO control module.

4. How can I diagnose OBDII code P251A in my 2017 GMC Sierra?

- To diagnose P251A, you may need to perform a thorough inspection of the PTO enable switch, check the wiring and connectors for damage, and use a diagnostic scanner to retrieve and interpret trouble codes.

5. Can I still drive my 2017 GMC Sierra with OBDII code P251A?

- It is not recommended to drive your GMC Sierra with an active P251A code, as it may lead to PTO system malfunctions and potential safety hazards.

6. How can I repair OBDII code P251A in my 2017 GMC Sierra?

- Repairing P251A may involve replacing the faulty power take-off enable switch, repairing damaged wiring or connectors, or reprogramming the PTO control module as necessary.

7. Is it safe to reset the OBDII code P251A in my 2017 GMC Sierra?

- While resetting the code may temporarily turn off the check engine light, it is essential to diagnose and repair the underlying issue causing P251A to ensure safe operation of the PTO system.

8. Can a DIY enthusiast fix OBDII code P251A in a 2017 GMC Sierra?

- DIY enthusiasts with automotive repair experience may be able to address P251A by following repair guides and utilizing the necessary tools for diagnosing and fixing the issue.

9. How much does it cost to repair OBDII code P251A in a 2017 GMC Sierra at a dealership?

- The cost of repairing P251A at a dealership can vary based on the specific diagnosis and required repairs, including parts and labor costs. It's advisable to obtain a detailed estimate from the dealership.

10. What should I do if OBDII code P251A persists in my 2017 GMC Sierra after repairs?

- If P251A continues to reappear after repairs, it may indicate an unresolved issue or a related problem. Revisiting the diagnosis process or seeking professional assistance can help address the persistent code.