AutoCodesGMC – P0757 2018 GMC Sierra

P0757 2018 GMC Sierra Code - Shift Solenoid Valve 2 Performance Stuck On

Quick Answer

The transmission fluid pressure switch, also known as the pressure switch manifold, is a multiple switch assembly made up of 3 normally open pressure switches and 1 normally closed pressure switch. 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
P0757 2018 GMC Sierra indicates Shift Solenoid Valve 2 Performance Stuck On.
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 215
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Mar 25, 2024
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Code P0757 2018 GMC Sierra Description

The transmission fluid pressure switch, also known as the pressure switch manifold, is a multiple switch assembly made up of 3 normally open pressure switches and 1 normally closed pressure switch. Pressure switch 1 monitor shift valve 1 positioning, pressure switch 2 monitors shift valve 2 positionings, and pressure switch 3 monitors shift valve 3 positionings. The normally open pressure switches 1–3 communicate the positioning to the transmission control module (TCM). The position of shift valves 1–3 is controlled by 3 normally closed shift solenoid valves. When energized, the shift solenoid valves directly control the main pressure to shift valve 1, 2, or 3, which strokes the shift valve. When the valve is stroked, an exhaust passage is blocked and fluid pressure to the pressure switch increases. The Diagnostic Trouble Code (DTC) will be set if the shift solenoid 2 is commanded off and pressure switch 2 remains on for 6–10 s, depending on the transmission fluid temperature.
OBDII Code P0757 2018 GMC Sierra - Shift Solenoid Valve 2 Performance Stuck On - AutoCodes.com
P0757 2018 GMC Sierra Code - Shift Solenoid Valve 2 Performance Stuck On

What are the Possible Causes of the DTC P0757 2018 GMC Sierra?

  • 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
  • Faulty Transmission Control Module (TCM)

How to Fix the DTC P0757 2018 GMC Sierra?

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 P0757 2018 GMC Sierra 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 P0757 2018 GMC Sierra code?

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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 P0757 2018 GMC Sierra Code

1. What does code P0757 mean on a 2018 GMC Sierra?

Code P0757 indicates that shift solenoid valve 2 is stuck in the "on" position, causing issues with transmission performance.

2. What are the symptoms of a P0757 code on a 2018 GMC Sierra?

Common symptoms include harsh or erratic shifting, transmission slippage, poor acceleration, and the check engine light turning on.

3. What causes the P0757 code on a GMC Sierra?

Potential causes include a faulty shift solenoid, dirty or low transmission fluid, a malfunctioning transmission control module (TCM), or clogged transmission passages.

4. Can I drive my 2018 GMC Sierra with a P0757 code?

Driving with this code is not recommended as it can lead to further transmission damage and unsafe driving conditions.

5. How do I fix a P0757 code on my GMC Sierra?

Repairs may involve replacing the shift solenoid, flushing the transmission fluid, repairing wiring or connectors, or addressing issues in the TCM.

6. How much does it cost to fix a P0757 code on a GMC Sierra?

Repair costs can range from $150 to $400 for a solenoid replacement, but costs may increase if transmission damage or other issues are present.

7. How do I diagnose the P0757 code on a 2018 GMC Sierra?

Diagnosis involves checking the transmission fluid level and condition, inspecting the shift solenoid and wiring, and using a scan tool to monitor transmission inputs and outputs.

8. Can low transmission fluid cause a P0757 code?

Yes, low or dirty transmission fluid can restrict solenoid operation, leading to a P0757 code.

9. Is a P0757 code specific to the GMC Sierra?

No, the P0757 code can appear on other vehicles with similar transmission systems, but the diagnostic and repair process may vary.

10. Will resetting the check engine light fix a P0757 code?

Resetting the light may clear the code temporarily, but the underlying issue must be addressed to prevent the code from returning.

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