AutoCodes – GMC – P0977 2014 GMC Sierra

P0977 2014 GMC Sierra Code - Shift Solenoid 'B' Open Or Short To Power

Quick Answer

The shift solenoid 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 Transmission Control Solenoid Valve. 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: P0977 2014 GMC Sierra indicates Shift Solenoid 'B' Open Or Short To Power.
Common causes: Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Transmission Control Solenoid Valve.
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 196

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
FAQs
Comments
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Code P0977 2014 GMC Sierra Description

The shift solenoid 2 is part of the control solenoid valve assembly which has no serviceable parts. The shift solenoid 2 is a normally closed ON/OFF solenoid and is controlled by the Transmission Control Module through a low side driver. When the shift solenoid 2 is energized, shift solenoid 2 fluid pressure is directed to the clutch select valve 3. Power to the shift solenoid 2 is supplied by the Transmission Control Module through a high-side driver. The high-side driver protects the circuit and components from excessive current flow. If excessive current flow is detected, the high side driver will turn OFF. When the fault is corrected, the high-side driver will reset. The Diagnostic Trouble Code (DTC) will be set when the Transmission Control Module detects an internal high voltage electrical malfunction of the shift solenoid 2 control circuit when the shift solenoid 2 is commanded ON for 2 seconds.

OBDII Code P0977 2014 GMC Sierra - Shift Solenoid 'B' Open Or Short To Power - AutoCodes.com — P0977 2014 GMC Sierra Code - Shift Solenoid 'B' Open Or Short To Power

What does this mean?

What are the Possible Causes of the DTC P0977 2014 GMC Sierra?

Low transmission fluid level
Dirty transmission fluid
Faulty Transmission Control Solenoid Valve
Transmission Control Solenoid Valve harness is open or shorted
Transmission Control Solenoid Valve circuit poor electrical connection

How to Fix the DTC P0977 2014 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 P0977 2014 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 P0977 2014 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 P0977 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code P0977 in a 2014 GMC Sierra?

- Common symptoms include harsh shifting, transmission slippage, inability to shift gears, and the transmission getting stuck in a particular gear.

2. What does the OBDII code P0977 Shift Solenoid 'B' Open Or Short To Power mean for a 2014 GMC Sierra?

- This code indicates a problem with the shift solenoid 'B', signaling that it is either open or shorted to power, affecting the transmission's shifting performance.

3. What are the possible causes of OBDII code P0977 in a 2014 GMC Sierra?

- Potential causes include a faulty shift solenoid 'B', damaged wiring or connectors related to the solenoid, low transmission fluid levels, or a defective transmission control module.

4. How can I diagnose the issue related to OBDII code P0977 in my 2014 GMC Sierra?

- Diagnosis involves checking the shift solenoid 'B' for continuity, inspecting the wiring and connectors for any damage, ensuring proper transmission fluid levels, and scanning the transmission control module for related error codes.

5. Can I continue driving my 2014 GMC Sierra with OBDII code P0977 present?

- It is not recommended to continue driving with this code present as it can lead to further transmission damage and potential safety hazards. It is advisable to address the issue promptly.

6. How can I repair OBDII code P0977 in my 2014 GMC Sierra?

- Repair involves replacing the faulty shift solenoid 'B', repairing or replacing damaged wiring or connectors, ensuring proper transmission fluid levels, and clearing the error code with a diagnostic tool.

7. Is it necessary to reset the OBDII code P0977 after repairing the issue in a 2014 GMC Sierra?

- Yes, it is essential to clear the error code after resolving the underlying problem to ensure the transmission control module recognizes the repair and operates correctly.

8. Can a DIY enthusiast fix OBDII code P0977 in a 2014 GMC Sierra?

- Depending on the individual's skill level and access to tools, a DIY enthusiast may be able to address this issue by following repair guides and being cautious when working on the transmission system.

9. What are the potential risks of ignoring OBDII code P0977 in a 2014 GMC Sierra?

- Ignoring this code can lead to worsening transmission problems, potential transmission failure, safety concerns while driving, and increased repair costs if left unresolved.

10. How long does it typically take to repair OBDII code P0977 in a 2014 GMC Sierra?

- The repair time can vary depending on the exact cause of the issue, the availability of parts, and the skill level of the technician. On average, it may take a few hours to a full day to complete the repair.