AutoCodes – GMC – P0776 GMC

P0776 GMC 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 GMC 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 14,013

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

What does this mean?

What are the Possible Causes of the DTC P0776 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 P0776 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 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.

There is a factory service bulletin for the following GMC Models:
2007-2009 GMC Acadia
2007-2009 GMC Acadia Factory Service Bulletin OBDII Code P0776

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0776 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 P0776 GMC code?

Need more information on how to fix the P0776 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0776 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P0776 2014 GMC Sierra — Clutch Pressure Control Solenoid 2 Stuck Off
P0776 2015 GMC Sierra — Clutch Pressure Control Solenoid 2 Stuck Off
P0776 2016 GMC Sierra — Clutch Pressure Control Solenoid 2 Stuck Off
P0776 2017 GMC Sierra — Clutch Pressure Control Solenoid 2 Stuck Off
P0776 2018 GMC Sierra — Clutch Pressure Control Solenoid 2 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 P0776 GMC Code

1. What are the common symptoms of OBDII code P0776 in a GMC vehicle?

- Common symptoms include harsh shifting, slipping gears, delayed engagement, and the transmission being stuck in one gear.

2. What does the OBDII code P0776 indicate in a GMC vehicle?

- This code indicates that the Clutch Pressure Control Solenoid 2 is stuck off, affecting the operation of the transmission.

3. What are the possible causes of OBDII code P0776 in a GMC vehicle?

- Possible causes include a faulty Clutch Pressure Control Solenoid 2, wiring issues, low transmission fluid, or a malfunctioning transmission control module.

4. How can I diagnose the Clutch Pressure Control Solenoid 2 issue causing OBDII code P0776 in my GMC vehicle?

- Diagnosing the issue involves checking the wiring for any damage, testing the solenoid for proper operation, and ensuring the transmission fluid is at the correct level and in good condition.

5. What are the repair options for OBDII code P0776 in a GMC vehicle?

- Repairs may involve replacing the Clutch Pressure Control Solenoid 2, repairing any damaged wiring, addressing low transmission fluid levels, or reprogramming the transmission control module.

6. Can I drive my GMC vehicle with OBDII code P0776 present?

- It is not recommended to drive the vehicle with this code present, as it can lead to further damage to the transmission and potential safety issues on the road.

7. How much does it typically cost to repair OBDII code P0776 in a GMC vehicle?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from $200 to $600, including parts and labor.

8. Are there any preventive maintenance tips to avoid OBDII code P0776 in a GMC vehicle?

- Regularly checking and changing the transmission fluid, performing routine vehicle inspections, and addressing any transmission-related issues promptly can help prevent this code from occurring.

9. Can a DIY enthusiast fix OBDII code P0776 in a GMC vehicle?

- While some experienced DIY enthusiasts may be able to diagnose and replace the Clutch Pressure Control Solenoid 2 themselves, it is recommended to consult a professional mechanic for accurate diagnosis and repairs.

10. How long does it take to repair OBDII code P0776 in a GMC vehicle?

- The repair time can vary depending on the exact cause of the issue and the availability of parts, but it typically takes a few hours to a full day to complete the repairs.