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AutoCodes – GMC – P0751 GMC

P0751 GMC 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 GMC 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 23,499
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Mar 25, 2024
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Code P0751 GMC 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 GMC - Shift Solenoid Valve 1 Performance Stuck Off - AutoCodes.com
P0751 GMC Code - Shift Solenoid Valve 1 Performance Stuck Off
What does this mean?

What are the Possible Causes of the DTC P0751 GMC?

  • 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 GMC?

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 GMC 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 P0751 GMC code?

Need more information on how to fix the P0751 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0751 GMC code diagnosed by a professional: Find a repair shop in your area

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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