AutoCodes – Chevrolet – P251A 2017 Chevrolet Silverado

P251A 2017 Chevrolet Silverado 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 Chevrolet Silverado 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 286

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 Chevrolet Silverado 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 Chevrolet Silverado - Power Take-Off Enable Switch Circuit - AutoCodes.com — P251A 2017 Chevrolet Silverado Code - Power Take-Off Enable Switch Circuit

What does this mean?

What are the Possible Causes of the DTC P251A 2017 Chevrolet Silverado?

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 Chevrolet Silverado?

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 Chevrolet Silverado 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 2017 Chevrolet Silverado 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 2017 Chevrolet Silverado Code

1. What does OBDII code P251A on a 2017 Chevrolet Silverado indicate?

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

2. What are the common symptoms of OBDII code P251A in a 2017 Chevrolet Silverado?

Common symptoms of code P251A may include an illuminated check engine light, failure of the PTO system to engage, or issues with vehicle performance.

3. What are the possible causes of OBDII code P251A on a 2017 Chevrolet Silverado?

Possible 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 the Power Take-Off Enable Switch Circuit issue triggering OBDII code P251A in a 2017 Chevrolet Silverado?

Diagnosing code P251A may involve visually inspecting the PTO enable switch and its wiring, testing the switch for continuity, and using a scan tool to check for any related trouble codes.

5. Can I continue driving my 2017 Chevrolet Silverado with OBDII code P251A?

It is generally not recommended to continue driving the vehicle with an active P251A code, as it may affect the proper functioning of the Power Take-Off system and potentially lead to further damage.

6. How can I repair OBDII code P251A on my 2017 Chevrolet Silverado?

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

7. Is it possible to reset OBDII code P251A in a 2017 Chevrolet Silverado without fixing the underlying issue?

While you can clear the code using an OBDII scanner, it is important to address the root cause of the problem to prevent the code from reoccurring.

8. Are there any specific maintenance tips to prevent OBDII code P251A on a 2017 Chevrolet Silverado?

Regularly inspecting the PTO enable switch and its wiring for damage, ensuring proper connection, and following recommended maintenance schedules can help prevent code P251A.

9. Can extreme weather conditions or rough terrain trigger OBDII code P251A in a 2017 Chevrolet Silverado?

Extreme weather conditions or rough terrain may not directly trigger code P251A, but they can potentially exacerbate existing issues with the PTO enable switch circuit.

10. How long does it typically take to repair OBDII code P251A on a 2017 Chevrolet Silverado?

The repair time for code P251A can vary depending on the exact cause of the issue, but it may take anywhere from a few hours to a day to diagnose and fix the problem successfully.