AutoCodes – GMC – P0756 GMC

P0756 GMC Code - Shift Solenoid Valve 2 Performance Stuck Off

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: P0756 GMC indicates Shift Solenoid Valve 2 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 17,782

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
Cost to Diagnose
Comments
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Code P0756 GMC 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 positioning 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 1–3. 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 shift 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 valve 2 is commanded on and pressure switch 2 remains off for 5–12 s, depending on the transmission fluid temperature.

OBDII Code P0756 GMC - Shift Solenoid Valve 2 Performance Stuck Off - AutoCodes.com — P0756 GMC Code - Shift Solenoid Valve 2 Performance Stuck Off

What does this mean?

What are the Possible Causes of the DTC P0756 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
Faulty Transmission Control Module (TCM)

How to Fix the DTC P0756 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0756 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.

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Information for Specific GMC Models

P0756 2014 GMC Sierra — Shift Solenoid Valve 2 Performance Stuck Off
P0756 2015 GMC Sierra — Shift Solenoid Valve 2 Performance Stuck Off
P0756 2016 GMC Sierra — Shift Solenoid Valve 2 Performance Stuck Off
P0756 2017 GMC Sierra — Shift Solenoid Valve 2 Performance Stuck Off
P0756 2018 GMC Sierra — Shift Solenoid Valve 2 Performance Stuck Off

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 P0756 GMC Code

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josh goin
Date: December 31, 2014 at 6:45 pm

So I have a 2005 GMC 1500 that wouldn't shift to higher gears so i replaced the solenoid and fixed that problem but now it will not pull in reverse and it acts like it wants to pull forward in neutral ?

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