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Engine-Codes – Generic – P0977

P0977 Code - Shift Solenoid 'B' Control Circuit High

Quick Answer

The P0977 diagnostic trouble code refers to an issue with the Shift Solenoid 'B' Control Circuit in the vehicle's transmission system. Common causes include Faulty shift solenoid 'B', Wiring or connector issues in the shift solenoid circuit, Corrosion or damage to electrical connections. 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 indicates Shift Solenoid 'B' Control Circuit High.
Common causes
Common causes include Faulty shift solenoid 'B', Wiring or connector issues in the shift solenoid circuit, Corrosion or damage to electrical connections.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code P0977 Description

The P0977 diagnostic trouble code refers to an issue with the Shift Solenoid 'B' Control Circuit in the vehicle's transmission system. The shift solenoid is responsible for controlling the flow of transmission fluid to engage or disengage gears within the transmission. In this case, a high voltage condition has been detected in the circuit that controls the operation of Shift Solenoid 'B'. This can lead to improper shifting of gears, causing a range of performance issues in the vehicle.

OBDII Code P0977 - Shift Solenoid 'B' Control Circuit High
P0977 Code - Shift Solenoid 'B' Control Circuit High

Common Causes of P0977

  1. Faulty shift solenoid 'B'
  2. Wiring or connector issues in the shift solenoid circuit
  3. Corrosion or damage to electrical connections
  4. Problems with the TCM or transmission control unit (TCU)
  5. Low transmission fluid levels or contaminated fluid

Symptoms of P0977

  1. Delayed or harsh shifting
  2. Transmission slipping
  3. Erratic shifting patterns
  4. Transmission getting stuck in a specific gear

How to Fix P0977

  1. Diagnose the issue by performing a thorough inspection of the shift solenoid 'B' circuit, including the wiring, connectors, and the solenoid itself.
  2. Test the shift solenoid 'B' for proper operation using a multimeter to check for continuity and resistance.
  3. Replace the shift solenoid 'B' if it is found to be faulty, ensuring proper installation and secure connections.
  4. Check and repair any damaged wiring or connectors in the circuit, ensuring a reliable electrical connection.
  5. Clear the fault codes and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P0977

The typical repair costs for addressing a Shift Solenoid 'B' Control Circuit High code can vary depending on the make and model of the vehicle, as well as the extent of the repairs needed. On average, the parts for a new shift solenoid can range from $50 to $200, while the labor costs can range from $100 to $300. Additional costs may be incurred for diagnostic testing, fluid replacement, or any other necessary repairs. It's advisable to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on your specific vehicle and location. Labor rates at auto repair shops can vary between $80 and $150 per hour, with rates potentially higher at dealerships or in metropolitan areas.

What does this mean?

Tech Notes for P0977













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Code P0977 Information for Specific Makes

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.

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