AutoCodes – GMC – P0776 2017 GMC Sierra

P0776 2017 GMC Sierra Code - Clutch Pressure Control Solenoid 2 Stuck Off

Quick Answer

The clutch pressure control solenoid valve 2 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: P0776 2017 GMC Sierra indicates Clutch Pressure Control Solenoid 2 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 204

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
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0776 2017 GMC Sierra Description

The clutch pressure control solenoid valve 2 is part of the control solenoid valve assembly, which has no serviceable parts. The pressure control solenoid valve 2 regulates transmission fluid pressure to the 3-5-Reverse clutch regulator valve which controls pressure to the 3-5-Reverse clutch. The Transmission Control Module calculates the gear ratio based on the RPM signals from the input speed sensor (ISS) and the output speed sensor (OSS). The Transmission Control Module compares the expected transmission gear ratio to the calculated gear ratio for each commanded gear. The Diagnostic Trouble Code (DTC) will be set when the Transmission Control Module has detected an incorrect gear ratio or neutral condition when the 3-5-R clutch is commanded ON. This condition must occur 3 times.

OBDII Code P0776 2017 GMC Sierra - Clutch Pressure Control Solenoid 2 Stuck Off - AutoCodes.com — P0776 2017 GMC Sierra Code - Clutch Pressure Control Solenoid 2 Stuck Off

What does this mean?

What are the Possible Causes of the DTC P0776 2017 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

How to Fix the DTC P0776 2017 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 does this mean?

Code Tech Notes

When a transmission solenoid has malfunctioned, 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 dirty, it's 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 mechanical transmission 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 P0776 2017 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.

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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 P0776 2017 GMC Sierra Code

1. What does the OBDII code P0776 mean on a 2017 GMC Sierra?

P0776 indicates that the Powertrain Control Module (PCM) has detected an issue with Clutch Pressure Control Solenoid 2, specifically that it is stuck in the "off" position.

2. What are common symptoms of the P0776 code in a 2017 GMC Sierra?

Common symptoms include transmission slipping, harsh or delayed shifting, reduced fuel efficiency, and the vehicle entering limp mode. The check engine light may also be illuminated.

3. What causes the P0776 code in a 2017 GMC Sierra?

Possible causes include a faulty clutch pressure control solenoid, low or dirty transmission fluid, a clogged transmission fluid filter, internal transmission issues, or damaged wiring to the solenoid.

4. Can I drive my 2017 GMC Sierra with the P0776 code?

Itâ€™s not recommended, as driving with this code can cause further damage to the transmission. Address the issue as soon as possible to avoid costly repairs.

5. How do I diagnose the P0776 code on a 2017 GMC Sierra?

Diagnosis typically involves scanning for additional codes, inspecting the transmission fluid condition, checking the solenoid wiring and connectors, and testing the functionality of the clutch pressure control solenoid using a multimeter or specialized diagnostic tools.

6. How do I fix the P0776 code on a 2017 GMC Sierra?

Repairs may include replacing the clutch pressure control solenoid, flushing and replacing the transmission fluid, cleaning or replacing the transmission fluid filter, or repairing damaged wiring or connectors.

7. How much does it cost to repair the P0776 code on a 2017 GMC Sierra?

The repair cost can range from $150 to $400 for replacing the solenoid, while more extensive transmission repairs could exceed $1,000 depending on the extent of the damage.

8. Can low transmission fluid cause the P0776 code?

Yes, low or dirty transmission fluid can cause the solenoid to malfunction, leading to the P0776 code. Always check and maintain proper fluid levels.

9. How do I prevent the P0776 code from occurring again?

Regularly check and change the transmission fluid, replace the fluid filter as recommended, and address any transmission issues promptly to prevent solenoid damage.

10. Does the P0776 code always mean the solenoid is bad?

Not necessarily. The issue could also stem from wiring problems, transmission fluid issues, or internal transmission damage, so proper diagnosis is essential.