AutoCodes – Buick – P251E Buick

P251E Buick Code - Power Take-Off Engine Shutdown Control Circuit Low Voltage

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) Control Module, Power Take-Off Control Module harness is open or shorted, Power Take-Off Control Module 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: P251E Buick indicates Power Take-Off Engine Shutdown Control Circuit Low Voltage.
Common causes: Common causes include Faulty Power Take-Off (PTO) Control Module, Power Take-Off Control Module harness is open or shorted, Power Take-Off Control Module 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 383

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 P251E Buick 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 engine shutdown control circuit that is above or below a predetermined voltage threshold.

OBDII Code P251E Buick - Power Take-Off Engine Shutdown Control Circuit Low Voltage - AutoCodes.com — P251E Buick Code - Power Take-Off Engine Shutdown Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P251E Buick?

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

How to Fix the DTC P251E Buick?

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 P251E Buick 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 P251E Buick Code

1. What are common symptoms of OBDII code P251E in a Buick related to the Power Take-Off Engine Shutdown Control Circuit Low Voltage?

- Common symptoms include engine stalling or shutting off unexpectedly, reduced power while driving, and the inability to engage the power take-off (PTO) system.

2. What are possible causes of the P251E code in a Buick?

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

3. How can I diagnose the P251E code in my Buick?

- Diagnosis involves using a diagnostic scanner to retrieve the trouble codes, inspecting the PTO control module and related wiring for any visible damage, and testing the voltage in the circuit using a multimeter.

4. Can I continue to drive my Buick with the P251E trouble code present?

- It is not recommended to continue driving with the P251E code as it can lead to further damage or safety issues, such as sudden loss of power while driving.

5. How can I repair the Power Take-Off Engine Shutdown Control Circuit Low Voltage issue in my Buick?

- Repair options may include replacing the faulty PTO control module, repairing or replacing damaged wiring or connectors, ensuring proper voltage supply to the circuit, and testing the PTO system functionality after repairs are completed.

6. Will resetting the trouble codes make the P251E code disappear permanently?

- Resetting the trouble codes may temporarily clear the P251E code, but if the underlying issue causing the code is not addressed, it is likely to reappear upon driving the vehicle.

7. Is the Power Take-Off Engine Shutdown Control Circuit Low Voltage a serious issue in a Buick?

- Yes, the P251E code should be addressed promptly as it can impact the drivability and safety of the vehicle, especially if the engine shutdown control circuit is not functioning properly.

8. Can a DIY enthusiast with basic automotive knowledge fix the P251E code in a Buick?

- Depending on the specific cause of the code, a DIY enthusiast with basic automotive knowledge may be able to address the issue by inspecting and repairing wiring or connectors, but more complex repairs may require professional assistance.

9. Are there any recalls or service bulletins related to the P251E code in Buick vehicles?

- It is advisable to check with a Buick dealership or online resources for any relevant recalls or service bulletins related to the P251E code in specific Buick models to ensure all necessary repairs are performed.

10. What is the typical cost to repair the P251E code in a Buick at a professional auto repair shop?

- The cost of repairing the P251E code can vary depending on the extent of the issue, parts needed for replacement, and labor costs, but it is recommended to obtain estimates from reputable auto repair shops for an accurate assessment.