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P0977 2018 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 2018 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 2018 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 2018 Honda CR-V - Shift Solenoid Valve 'B' Circuit High
P0977 2018 Honda CR-V Code - Shift Solenoid Valve 'B' Circuit High

Common Causes of P0977 2018 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 2018 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 2018 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 2018 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.

Frequently Asked Questions about P0977 2018 Honda CR-V Code

What does the OBDII code P0977 mean for a 2018 Honda CR-V?

Code P0977 indicates a high electrical condition in the Shift Solenoid Valve 'B' Circuit, which is responsible for controlling gear shifts in the transmission.

What are the common symptoms of code P0977 in a 2018 Honda CR-V?

Symptoms may include harsh or erratic shifting, transmission stuck in one gear, reduced fuel efficiency, or the illumination of the check engine light.

What causes the P0977 code to appear on a 2018 Honda CR-V?

Common causes include a faulty shift solenoid 'B', damaged wiring or connectors in the solenoid circuit, transmission fluid issues, or a malfunctioning powertrain control module (PCM).

Can a bad shift solenoid cause the P0977 code?

Yes, a malfunctioning shift solenoid 'B' is one of the most common reasons for the P0977 code, as it directly affects the circuit operation.

How can I diagnose the P0977 code on my 2018 Honda CR-V?

Start by inspecting the wiring and connectors for damage, checking the transmission fluid level and condition, and testing the shift solenoid 'B' for proper operation using a multimeter.

Can I drive my 2018 Honda CR-V with code P0977 active?

While the car may still be drivable, continued operation can cause further damage to the transmission or other components, so it’s best to address the issue promptly.

How much does it cost to fix the P0977 code on a 2018 Honda CR-V?

Repair costs can range from $100 to $400 depending on whether the issue is a faulty solenoid, wiring repair, or transmission fluid replacement.

How do I reset the P0977 code after repairs on my Honda CR-V?

After addressing the issue, you can clear the code using an OBDII scanner. If the problem is resolved, the light should stay off; otherwise, the code may reappear.

Is it necessary to replace the transmission fluid to fix code P0977?

If the transmission fluid is dirty or low, replacing or refilling it may resolve the issue. However, it’s not always the sole cause of the code.

What tools do I need to fix code P0977 on a 2018 Honda CR-V?

You’ll typically need an OBDII scanner, a multimeter for electrical testing, basic hand tools, and possibly a transmission fluid dipstick or pump.

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