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Engine-Codes – GMC – P0751 2018 GMC Sierra

P0751 2018 GMC Sierra Code - Shift Solenoid Valve 1 Performance Stuck Off

Quick Answer

The P0751 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates that the transmission control module (TCM) has detected a performance issue with shift solenoid valve 1. Common causes include Faulty shift solenoid valve 1, Electrical issues within the solenoid or wiring, Mechanical failure of the solenoid. 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 2018 GMC Sierra indicates Shift Solenoid Valve 1 Performance Stuck Off.
Common causes
Common causes include Faulty shift solenoid valve 1, Electrical issues within the solenoid or wiring, Mechanical failure of the solenoid.
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 17, 2024
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Code P0751 2018 GMC Sierra Description

The P0751 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates that the transmission control module (TCM) has detected a performance issue with shift solenoid valve 1. This solenoid is responsible for controlling the flow of transmission fluid to engage the appropriate gear for smooth shifting. When the solenoid is stuck off, it means that it is not functioning properly, leading to potential transmission problems.

OBDII Code P0751 2018 GMC Sierra - Shift Solenoid Valve 1 Performance Stuck Off
P0751 2018 GMC Sierra Code - Shift Solenoid Valve 1 Performance Stuck Off

Common Causes of P0751 2018 GMC Sierra

  1. Faulty shift solenoid valve 1
  2. Electrical issues within the solenoid or wiring
  3. Mechanical failure of the solenoid
  4. TCM malfunction
  5. Low transmission fluid levels

Symptoms of P0751 2018 GMC Sierra

  1. Harsh or delayed shifting
  2. Erratic transmission behavior
  3. Transmission getting stuck in a single gear
  4. Poor acceleration
  5. Reduced fuel efficiency

How to Fix P0751 2018 GMC Sierra

  1. Begin by diagnosing the specific cause of the issue using a scan tool to retrieve the DTC and checking the shift solenoid valve 1 for proper operation.
  2. Inspect the wiring and connectors associated with the solenoid for any damage or loose connections.
  3. If the shift solenoid valve 1 is faulty, replace it with a new one following manufacturer guidelines.
  4. Clear the DTC from the TCM memory and perform a test drive to ensure the issue has been resolved.
  5. Check and top up transmission fluid levels if necessary to ensure proper operation.

Cost to Fix P0751 2018 GMC Sierra

The typical repair costs for addressing a P0751 code on a 2018 GMC Sierra can range from $200 to $500, including parts and labor. However, actual costs may vary depending on the specific diagnosis time and labor rates at auto repair shops. It's recommended to inquire about local rates to get a more accurate estimate for this repair.

What does this mean?

Tech Notes for P0751 2018 GMC Sierra

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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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 2018 GMC Sierra Code

1. What does OBDII code P0751 for a 2018 GMC Sierra mean?

The P0751 code indicates a performance issue with Shift Solenoid Valve 1, specifically that it is stuck in the off position.

2. What are the common symptoms associated with OBDII code P0751 in a 2018 GMC Sierra?

Common symptoms of P0751 may include harsh shifting, transmission slipping, decreased fuel efficiency, and the transmission getting stuck in a single gear.

3. What are the possible causes of OBDII code P0751 in a 2018 GMC Sierra?

Potential causes of P0751 include a faulty shift solenoid, low transmission fluid level, dirty transmission fluid, electrical issues, or a malfunctioning transmission control module.

4. How serious is OBDII code P0751 in a 2018 GMC Sierra?

While the vehicle may still be operable with this code, it is important to address it promptly to prevent further damage to the transmission and ensure safe driving conditions.

5. Can I continue driving my 2018 GMC Sierra with OBDII code P0751?

It is not recommended to continue driving with the P0751 code present as it can lead to more severe transmission problems over time. It is best to have the issue diagnosed and repaired as soon as possible.

6. How can I diagnose OBDII code P0751 in a 2018 GMC Sierra?

Diagnosing P0751 typically involves conducting a thorough inspection of the transmission system, checking the shift solenoid, inspecting the transmission fluid, and using a scan tool to gather data from the vehicle's computer.

7. What are some repair tips for fixing OBDII code P0751 in a 2018 GMC Sierra?

Repair tips may include replacing the faulty shift solenoid, performing a transmission fluid flush and filter change, checking and repairing any damaged wiring, or resetting the transmission control module.

8. Will resetting the OBDII code P0751 in a 2018 GMC Sierra make it go away permanently?

Simply resetting the code may temporarily clear the warning light, but if the underlying issue causing the P0751 code is not addressed, it is likely to reappear.

9. How much does it cost to repair OBDII code P0751 in a 2018 GMC Sierra?

The cost of repairing P0751 can vary depending on the root cause of the issue, the extent of the repairs needed, and labor costs. It is advisable to consult with a qualified mechanic for an accurate estimate.

10. Can I fix OBDII code P0751 in a 2018 GMC Sierra myself?

While some DIY enthusiasts may be able to address simpler causes like low transmission fluid or damaged wiring, diagnosing and repairing P0751 often requires specialized tools and expertise, so it is recommended to seek professional help.

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