P099B — Shift Solenoid G Control Circuit Low

What Does P099B Mean?

P099B is a diagnostic trouble code indicating: Shift Solenoid G Control Circuit Low. This code relates to the transmission system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P099B

⚠️ Check Engine Light (MIL) illuminated
⚠️ Shift Solenoid G reading at zero or minimum value
⚠️ Related system not functioning or in fail-safe mode
⚠️ Harsh or delayed shifting

Common Causes

🔍 Open or broken wire in Shift Solenoid G circuit
🔍 Poor ground connection at Shift Solenoid G
🔍 Faulty Shift Solenoid G with no output signal
🔍 Disconnected or loose Shift Solenoid G connector
🔍 Blown fuse in related circuit

Frequently Asked Questions

What does P099B mean?

P099B indicates: Shift Solenoid G Control Circuit Low. The vehicle's computer has detected that the Shift Solenoid G is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P099B?

Only short distances if absolutely necessary. P099B affects a critical system and should be diagnosed within a few days to avoid further damage.

How much does it cost to fix P099B?

Repair costs for P099B typically range from $20 to $500, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Repair broken wire or restore ground in Shift Solenoid G circuit
🔧 Clean and secure Shift Solenoid G connector and ground points
🔧 Replace failed Shift Solenoid G

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P099B: Shift Solenoid G Control Circuit Low