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Engine-Codes – GMC – P0751 GMC

P0751 GMC Code - Shift Solenoid Valve 1 Performance Stuck Off

Quick Answer

The P0751 GMC code indicates a problem with the Shift Solenoid Valve 1, specifically that it is stuck off. Common causes include Faulty shift solenoid valve 1, Wiring issues or bad connections, Clogged transmission filter. 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 GMC indicates Shift Solenoid Valve 1 Performance Stuck Off.
Common causes
Common causes include Faulty shift solenoid valve 1, Wiring issues or bad connections, Clogged transmission filter.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code P0751 GMC Description

The P0751 GMC code indicates a problem with the Shift Solenoid Valve 1, specifically that it is stuck off. In an automatic transmission system, shift solenoids are responsible for controlling the flow of transmission fluid, which in turn controls the shifting of gears. When the Shift Solenoid Valve 1 is stuck off, it means that the transmission is not able to shift properly, leading to issues with acceleration, fuel efficiency, and overall performance of the vehicle.

OBDII Code P0751 GMC - Shift Solenoid Valve 1 Performance Stuck Off
P0751 GMC Code - Shift Solenoid Valve 1 Performance Stuck Off

Common Causes of P0751 GMC

  1. Faulty shift solenoid valve 1
  2. Wiring issues or bad connections
  3. Clogged transmission filter
  4. Low transmission fluid levels
  5. Internal transmission damage

Symptoms of P0751 GMC

  1. Harsh or delayed shifting
  2. Erratic shifting behavior
  3. Transmission slipping
  4. Inability to shift gears
  5. Reduced fuel efficiency

How to Fix P0751 GMC

  1. Perform a diagnostic scan to confirm the P0751 code and identify the specific cause of the issue.
  2. Inspect the shift solenoid valve 1, wiring, and connections for any signs of damage or wear.
  3. Check the transmission filter and fluid levels, replacing or topping up as necessary.
  4. If no issues are found with the wiring or fluid levels, replace the faulty shift solenoid valve 1.
  5. Clear the diagnostic trouble codes, test drive the vehicle to ensure proper shifting, and recheck for any recurring issues.

Cost to Fix P0751 GMC

The typical repair costs for addressing a P0751 GMC code can range from $200 to $500, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that the exact cost can vary based on factors such as the location of the repair shop, the make and model of the vehicle, and the type of engine. Additionally, diagnosis time and labor rates can influence the final cost, with rates ranging from $80 to $150 per hour at most auto repair shops. It is recommended to obtain quotes from multiple shops to compare prices and ensure a fair estimate for the repair.

What does this mean?

Tech Notes for P0751 GMC

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.

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Information for Specific GMC Models

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 GMC Code

1. What are common symptoms of OBDII code P0751 in a GMC vehicle?

Common symptoms include harsh shifting, delayed or erratic shifting, transmission slipping, and the Check Engine light illuminated on the dashboard.

2. What causes the OBDII code P0751 Shift Solenoid Valve 1 Performance Stuck Off in a GMC?

The code P0751 is typically triggered by a faulty shift solenoid valve 1, which may be stuck in the off position due to internal wear, electrical issues, or fluid contamination.

3. How serious is the OBDII code P0751 in a GMC vehicle?

While the vehicle may still be operable with this code present, it is advisable to address it promptly to prevent further damage to the transmission and ensure optimal performance.

4. Can I drive my GMC with the OBDII code P0751 Shift Solenoid Valve 1 Performance Stuck Off?

It is generally not recommended to drive the vehicle with this code present, as it can lead to transmission issues and potential safety hazards. It's best to have the issue diagnosed and repaired by a qualified technician.

5. How can I diagnose the OBDII code P0751 in my GMC?

Diagnosing code P0751 involves using a scan tool to retrieve the code, checking the transmission fluid level and condition, and performing tests to determine the condition of the shift solenoid valve 1.

6. What is the typical repair for OBDII code P0751 in a GMC?

The most common repair for code P0751 is to replace the faulty shift solenoid valve 1. It is recommended to also inspect and possibly replace the transmission fluid and filter during the repair process.

7. Are there any DIY tips for fixing the OBDII code P0751 in a GMC?

While some basic automotive knowledge is required, DIY enthusiasts may attempt to replace the shift solenoid valve 1 themselves. However, it is recommended to consult a professional if unsure about the repair process.

8. What are the potential consequences of ignoring the OBDII code P0751 Shift Solenoid Valve 1 Performance Stuck Off?

Ignoring this code can lead to further transmission damage, decreased fuel efficiency, and ultimately, more costly repairs down the line. It is best to address the issue promptly.

9. How long does it take to repair the OBDII code P0751 in a GMC?

The repair time for this code can vary depending on the extent of the issue and the availability of parts. In general, a skilled technician can complete the repair within a few hours to a day.

10. Is it necessary to reset the OBDII code P0751 after repairing the issue in a GMC?

After repairing the issue causing the P0751 code, it is recommended to clear the code using a scan tool to reset the Check Engine light and ensure that the repair was successful.

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