AutoCodes – Chevrolet – P0977 2018 Chevrolet Silverado

P0977 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 418

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0977 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado - Shift Solenoid 'B' Open Or Short To Power - AutoCodes.com — P0977 2018 Chevrolet Silverado Code - Shift Solenoid 'B' Open Or Short To Power

What does this mean?

What are the Possible Causes of the DTC P0977 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado code?

Need more information on how to fix the P0977 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0977 2018 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

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 2018 Chevrolet Silverado Code

What does OBDII code P0977 mean for a 2018 Chevrolet Silverado?

Code P0977 indicates that the Shift Solenoid 'B' circuit has an open or short to power, which can affect gear shifting performance.

What are the symptoms of code P0977 on a 2018 Chevrolet Silverado?

Symptoms may include erratic shifting, transmission slipping, failure to shift gears, or the vehicle entering limp mode.

What causes code P0977 on a 2018 Chevrolet Silverado?

Common causes include a faulty shift solenoid, damaged wiring or connectors in the solenoid circuit, or issues with the transmission control module.

Can driving with code P0977 damage my 2018 Chevrolet Silverado?

Continuing to drive with this code can lead to transmission damage, reduced performance, and safety risks due to erratic gear shifting.

How do you diagnose code P0977 on a 2018 Chevrolet Silverado?

Diagnosis typically involves inspecting the shift solenoid 'B', checking wiring and connectors for damage, and testing the transmission control module.

How do you fix code P0977 on a 2018 Chevrolet Silverado?

Repairs may include replacing the shift solenoid, repairing or replacing damaged wiring, or reprogramming the transmission control module.

Can a bad shift solenoid cause P0977 on a 2018 Chevrolet Silverado?

Yes, a malfunctioning shift solenoid 'B' is one of the most common causes of this code.

How much does it cost to fix code P0977 on a 2018 Chevrolet Silverado?

Repair costs vary but may range from $200 to $500 for solenoid replacement, plus labor costs, depending on the severity of the issue.

Can a weak battery cause code P0977 on a 2018 Chevrolet Silverado?

While rare, voltage issues due to a weak battery or alternator may contribute to electrical problems that trigger this code.

Do I need special tools to fix code P0977 on a 2018 Chevrolet Silverado?

Yes, diagnosing and fixing this code often requires tools like an OBDII scanner and multimeter to test electrical circuits and solenoid functionality.