P099B Code - Shift Solenoid 'G' Control Circuit Low
Quick Answer
The P099B diagnostic trouble code indicates a problem with the Shift Solenoid 'G' Control Circuit being low. Common causes include Faulty Shift Solenoid 'G', Wiring issues or poor electrical connections, Low transmission fluid level or contaminated fluid. 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
- P099B indicates Shift Solenoid 'G' Control Circuit Low.
- Common causes
- Common causes include Faulty Shift Solenoid 'G', Wiring issues or poor electrical connections, Low transmission fluid level or contaminated fluid.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P099B Description
The P099B diagnostic trouble code indicates a problem with the Shift Solenoid 'G' Control Circuit being low. In automatic transmission vehicles, shift solenoids play a crucial role in the operation of the transmission by controlling the flow of transmission fluid to engage different gears. Solenoid 'G' specifically controls the shifting of gears within the transmission. When the control circuit for this solenoid is detected as low, it means that the voltage signal being sent to the solenoid is below the expected range. This can lead to issues with gear shifting, causing the vehicle to have difficulty changing gears or not shifting at all.
Common Causes of P099B
- Faulty Shift Solenoid 'G'
- Wiring issues or poor electrical connections
- Low transmission fluid level or contaminated fluid
- Internal transmission damage
- Faulty transmission control module
Symptoms of P099B
- Delayed or harsh shifting between gears
- Transmission slipping
- Inability to shift gears
- Reduced fuel efficiency
- Illumination of the Check Engine Light
How to Fix P099B
- Begin by diagnosing the root cause of the issue using a professional diagnostic scanner to pinpoint the exact source of the problem.
- Inspect the wiring harness and connectors associated with the Shift Solenoid 'G' to check for any signs of damage or corrosion. Repair or replace as necessary.
- Test the Shift Solenoid 'G' itself to determine if it is functioning correctly. Replace the solenoid if found to be faulty.
- Check the transmission fluid level and condition. Top up or perform a fluid flush and filter replacement if needed.
- Clear the trouble codes from the vehicle's computer system and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P099B
The typical repair costs for addressing a Shift Solenoid 'G' Control Circuit Low code can vary depending on the specific cause of the issue and the extent of the repairs needed. On average, expect to pay between $200 and $500 for parts and labor. However, it is important to note that diagnostic time and labor rates can vary between different auto repair shops. It is recommended to obtain quotes from multiple shops in your area to get a more accurate estimate for your specific vehicle.
Need more information about the P099B code?
Need more information on how to fix the P099B code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P099B code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P099B Code
No Frequently Asked Questions about P099B Code found.
Discuss the causes and fixes for P099B OBDII Code
Code P099B comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.