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Engine-Codes – Honda – P0977 2021 Honda CR-V

P0977 2021 Honda CR-V Code - Shift Solenoid Valve 'B' Circuit High

Quick Answer

The P0977 code indicates a problem with the Shift Solenoid Valve 'B' circuit in Honda vehicles. Common causes include Faulty Shift Solenoid 'B' that may be stuck or malfunctioning, Damaged wiring or poor electrical connections in the solenoid circuit, Low transmission fluid levels or contaminated fluid affecting solenoid operation. 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 2021 Honda CR-V indicates Shift Solenoid Valve 'B' Circuit High.
Common causes
Common causes include Faulty Shift Solenoid 'B' that may be stuck or malfunctioning, Damaged wiring or poor electrical connections in the solenoid circuit, Low transmission fluid levels or contaminated fluid affecting solenoid operation.
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 Jun 23, 2025
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Code P0977 2021 Honda CR-V Description

The P0977 code indicates a problem with the Shift Solenoid Valve 'B' circuit in Honda vehicles. This solenoid is a crucial component of the transmission system, responsible for controlling the flow of transmission fluid to engage and disengage gears. When the code is triggered, it signifies that the Engine Control Module (ECM) has detected a high voltage condition in the circuit associated with Shift Solenoid 'B'. This can lead to improper shifting behavior, affecting the vehicle's overall performance.
OBDII Code P0977 2021 Honda CR-V - Shift Solenoid Valve 'B' Circuit High
P0977 2021 Honda CR-V Code - Shift Solenoid Valve 'B' Circuit High

Common Causes of P0977 2021 Honda CR-V

  1. Faulty Shift Solenoid 'B' that may be stuck or malfunctioning.
  2. Damaged wiring or poor electrical connections in the solenoid circuit.
  3. Low transmission fluid levels or contaminated fluid affecting solenoid operation.
  4. A malfunctioning Transmission Control Module (TCM) that fails to send the correct signals.
  5. Internal transmission issues, such as worn components or valve body problems.

Symptoms of P0977 2021 Honda CR-V

  1. Erratic or harsh shifting during acceleration or deceleration.
  2. Delayed engagement when shifting from park to drive or reverse.
  3. Transmission slipping or failing to shift into higher gears.
  4. Warning lights illuminated on the dashboard, such as the check engine light.
  5. Decreased fuel efficiency due to improper gear engagement.

How to Fix P0977 2021 Honda CR-V

  1. Diagnostic Testing: Begin by using an OBD-II scanner to confirm the P0977 code and check for any additional codes that may provide further insight into the issue.
  2. Visual Inspection: Inspect the wiring and connectors associated with the Shift Solenoid 'B' for any signs of damage, corrosion, or loose connections.
  3. Fluid Check: Examine the transmission fluid level and condition. If the fluid is low or contaminated, perform a fluid change and top off to the appropriate level.
  4. Solenoid Replacement: If the solenoid is determined to be faulty, replace Shift Solenoid 'B' with a new part, ensuring all electrical connections are secure.
  5. Test Drive: After repairs, conduct a test drive to ensure that the transmission operates smoothly and that the P0977 code does not reappear.

Cost to Fix P0977 2021 Honda CR-V

The cost to repair a P0977 code can vary significantly based on the specific diagnosis, parts needed, and labor rates in your area. On average, you can expect to pay between $150 and $500 for the repair. This estimate includes parts such as a new shift solenoid, which typically ranges from $50 to $200, and labor costs, which can vary from $80 to $150 per hour. Keep in mind that labor rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more competitive pricing. It's advisable to check local rates and obtain quotes from multiple repair facilities for a more accurate estimate.

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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.

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