P0977 Lexus Code - Shift Solenoid 'B' Control Circuit High
Quick Answer
The P0977 diagnostic trouble code for a Lexus indicates an issue with the Shift Solenoid 'B' Control Circuit High. Common causes include Faulty shift solenoid 'B', Wiring or connector issues in the shift solenoid circuit, Malfunctioning transmission control module (TCM). 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 Lexus 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, Malfunctioning transmission control module (TCM).
- 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 P0977 Lexus Description
The P0977 diagnostic trouble code for a Lexus indicates an issue with the Shift Solenoid 'B' Control Circuit High. This code is specific to the transmission system of the vehicle. The shift solenoid is responsible for controlling the flow of transmission fluid within the transmission. When the control circuit for Shift Solenoid 'B' is reporting a high voltage or resistance level, it means that there is a problem with the electrical signal being sent to the solenoid. This can lead to issues with shifting gears, causing the vehicle to have trouble accelerating, shifting smoothly, or maintaining speed.
Common Causes of P0977 Lexus
- Faulty shift solenoid 'B'
- Wiring or connector issues in the shift solenoid circuit
- Malfunctioning transmission control module (TCM)
- Problem with the powertrain control module (PCM)
- Low transmission fluid level or contaminated fluid
Symptoms of P0977 Lexus
- Erratic shifting or difficulty shifting gears
- Delayed engagement when shifting into gear
- Harsh or rough shifting
- Transmission slipping
- Illumination of the Check Engine Light
How to Fix P0977 Lexus
- Diagnose the issue by using a diagnostic scanner to read the trouble codes and data from the TCM.
- Inspect the wiring and connectors in the shift solenoid 'B' circuit for any damage or corrosion.
- Test the shift solenoid 'B' for proper functionality and replace it if necessary.
- Check and replace the transmission fluid if it is low or contaminated.
- Clear the trouble codes and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P0977 Lexus
The typical cost to repair a Shift Solenoid 'B' Control Circuit High code in a Lexus can range from $200 to $500, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It is advisable to check with local auto repair shops for a more accurate estimate of the repair costs.
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