AutoCodes – Generic – P251B

P251B Code - PTO Enable Switch Circuit Low

Quick Answer

The Powertrain Control Module (PCM) monitors the Power Take Off (PTO) Enable Switch circuit. Common causes include Faulty Power Take Off (PTO) Enable Switch, Power Take Off (PTO) Enable Switch harness is open or shorted, Power Take Off (PTO) 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: P251B indicates PTO Enable Switch Circuit Low.
Common causes: Common causes include Faulty Power Take Off (PTO) Enable Switch, Power Take Off (PTO) Enable Switch harness is open or shorted, Power Take Off (PTO) 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 3,928

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 Jan 17, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P251B Description

The Powertrain Control Module (PCM) monitors the Power Take Off (PTO) Enable Switch circuit. The PCM sets the OBDII code when the PTO Enable Switch is out of factory specifications.

OBDII Code P251B - PTO Enable Switch Circuit Low - AutoCodes.com — P251B Code - PTO Enable Switch Circuit Low

What does this mean?

What are the Possible Causes of the DTC P251B?

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

How to Fix the DTC P251B?

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 P251B 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 P251B code?

Need more information on how to fix the P251B code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific Makes

P251B Ford — PTO Enable Switch Circuit Low

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.