AutoCodes – GMC – P251A 2016 GMC Sierra

P251A 2016 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 2016 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 181

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

OBDII Code P251A 2016 GMC Sierra - Power Take-Off Enable Switch Circuit - AutoCodes.com — P251A 2016 GMC Sierra Code - Power Take-Off Enable Switch Circuit

What does this mean?

What are the Possible Causes of the DTC P251A 2016 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 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 P251A 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 P251A 2016 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 2016 GMC Sierra Code

1. What are common symptoms of OBDII code P251A in a 2016 GMC Sierra?

- Common symptoms include the power take-off system not engaging, a disabled power take-off switch, and an illuminated check engine light.

2. What does the OBDII code P251A indicate in a 2016 GMC Sierra?

- OBDII code P251A indicates a problem with the Power Take-Off Enable Switch Circuit in a 2016 GMC Sierra.

3. What are possible causes of OBDII code P251A in a 2016 GMC Sierra?

- Possible causes include a faulty power take-off switch, damaged wiring or connectors in the circuit, or a malfunctioning power take-off control module.

4. How can I diagnose the Power Take-Off Enable Switch Circuit issue in my 2016 GMC Sierra?

- Use a diagnostic scanner to retrieve the OBDII code, inspect the power take-off switch and its wiring for damage, and test the power take-off control module for proper functioning.

5. Can I continue driving my 2016 GMC Sierra with OBDII code P251A present?

- It is not recommended to continue driving with OBDII code P251A present, as it may affect the functionality of the power take-off system and potentially lead to further damage.

6. Is it possible to repair OBDII code P251A in a 2016 GMC Sierra myself?

- Depending on your automotive repair skills, you may be able to repair OBDII code P251A yourself by replacing the faulty power take-off switch, repairing damaged wiring, or addressing any issues with the power take-off control module.

7. How much does it typically cost to repair OBDII code P251A in a 2016 GMC Sierra at a professional mechanic or dealership?

- The cost of repairing OBDII code P251A can vary depending on the specific cause of the issue, but it may range from $200 to $500 at a professional mechanic or dealership.

8. Are there any preventive measures to avoid OBDII code P251A in a 2016 GMC Sierra in the future?

- Regularly inspecting and maintaining the power take-off system, including the switch and wiring, can help prevent issues that may trigger OBDII code P251A in the future.

9. Can OBDII code P251A in a 2016 GMC Sierra cause any other problems if left unresolved?

- If left unresolved, OBDII code P251A can potentially lead to a non-functional power take-off system, affecting the vehicle's performance and utility.

10. How long does it typically take to repair OBDII code P251A in a 2016 GMC Sierra?

- The repair time for OBDII code P251A can vary depending on the exact cause of the issue and the availability of parts, but it may take a few hours to a full day to diagnose and fix the problem.