AutoCodes – Buick – P0751 Buick

P0751 Buick Code - Shift Solenoid Valve 1 Performance Stuck Off

Quick Answer

The shift solenoid 1 is part of the control solenoid valve assembly which has no serviceable parts. Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Control Solenoid Valve Assembly. 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: P0751 Buick indicates Shift Solenoid Valve 1 Performance Stuck Off.
Common causes: Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Control Solenoid Valve Assembly.
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 9,819

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 Mar 25, 2024

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0751 Buick Description

The shift solenoid 1 is part of the control solenoid valve assembly which has no serviceable parts. The control solenoid valve assembly is attached to the lower control valve body. The solenoid operates by the Transmission Control Module opening or closing the ground circuit. With the solenoid circuit grounded (solenoid on), the internal plunger and metering ball block the exhaust fluid creating signal fluid pressure. The signal fluid acts against the clutch select valve 2 to overcome the valve spring force moving it to the apply position, allowing the shift. The shift solenoid 1 is commanded ON in Park, Reverse, Neutral, and Drive 1 Engine Braking, and commanded OFF in Drive 1–6 gear ranges. The Diagnostic Trouble Code (DTC) will be set when the gear slip is greater than 400 RPM for 2 s.

OBDII Code P0751 Buick - Shift Solenoid Valve 1 Performance Stuck Off - AutoCodes.com — P0751 Buick Code - Shift Solenoid Valve 1 Performance Stuck Off

What does this mean?

What are the Possible Causes of the DTC P0751 Buick?

Low transmission fluid level
Dirty transmission fluid
Faulty Control Solenoid Valve Assembly
Control Solenoid Valve Assembly harness or connectors
Control Solenoid Valve Assembly circuit is open or shorted

How to Fix the DTC P0751 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 does this mean?

Code Tech Notes

When a transmission solenoid is stuck off, in most cases the problem is not the electrical part of the solenoid; the problem is foreign material obstructing the mechanical function of the solenoid or the flow of the fluid through the transmission valve body. If the transmission fluid is very dirty, it is recommended to change the transmission fluid and if possible, remove the transmission pan for further diagnosis. Excessive debris or metal particles on the transmission pan could be an indication that there is a transmission mechanical failure, and that the transmission will need to be rebuilt or replaced.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0751 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 P0751 Buick Code

1. What are the common symptoms of OBDII code P0751 in a Buick related to the Shift Solenoid Valve 1 Performance Stuck Off?

Symptoms may include harsh or delayed shifting, transmission slipping, poor fuel economy, and the transmission staying in one gear.

2. What are some possible causes of the Shift Solenoid Valve 1 Performance Stuck Off code P0751 in a Buick?

Potential causes include a faulty shift solenoid, low transmission fluid, wiring issues, a malfunctioning TCM (transmission control module), or internal transmission problems.

3. How can I diagnose the cause of OBDII code P0751 in my Buick?

Diagnosis typically involves checking the transmission fluid level and condition, inspecting the wiring and connectors related to the shift solenoid, conducting a scan tool test, and possibly performing a pressure test on the transmission.

4. Can I continue to drive my Buick with OBDII code P0751 present?

It is not recommended to continue driving with this code present, as it can lead to further damage to the transmission and potentially result in a costly repair.

5. How can I repair OBDII code P0751 Shift Solenoid Valve 1 Performance Stuck Off in my Buick?

Repair options may include replacing the faulty shift solenoid, addressing any wiring issues, ensuring proper transmission fluid levels, or seeking professional help for more complex internal transmission problems.

6. Is it possible to reset the OBDII code P0751 in a Buick without fixing the underlying issue?

While clearing the code may temporarily turn off the check engine light, the underlying problem causing the code will persist and may lead to more serious transmission issues if left unresolved.

7. Are there any preventive maintenance tips to avoid encountering code P0751 in a Buick?

Regularly servicing the transmission, checking and maintaining proper fluid levels, addressing any leaks promptly, and ensuring timely repairs of any transmission-related symptoms can help prevent the occurrence of this code.

8. How long does it typically take to repair OBDII code P0751 Shift Solenoid Valve 1 Performance Stuck Off in a Buick?

The repair time can vary depending on the exact cause of the issue. Simple fixes like replacing a faulty solenoid may take a few hours, while more complex internal transmission repairs could require more time.

9. Can weather conditions or driving habits contribute to the occurrence of code P0751 in a Buick?

Extreme weather conditions, frequent towing, aggressive driving, or prolonged operation with low transmission fluid levels can potentially contribute to the development of issues leading to code P0751.