AutoCodes – Generic – P099A

P099A Code - Shift Solenoid 'G' Control Circuit Range/Performance

Quick Answer

The Transmission Control Module (TCM) monitors the Shift Solenoid signal. Common causes include Faulty Shift Solenoid 'G', Shift Solenoid 'G' harness is open or shorted, Shift Solenoid 'G' circuit poor electrical connection. 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: P099A indicates Shift Solenoid 'G' Control Circuit Range/Performance.
Common causes: Common causes include Faulty Shift Solenoid 'G', Shift Solenoid 'G' harness is open or shorted, Shift Solenoid 'G' circuit poor electrical connection.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 2,219

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 11, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P099A Description

The Transmission Control Module (TCM) monitors the Shift Solenoid signal. The TCM sets the OBDII code when the Shift Solenoid is not to factory specifications.

OBDII Code P099A - Shift Solenoid 'G' Control Circuit Range/Performance - AutoCodes.com — P099A Code - Shift Solenoid 'G' Control Circuit Range/Performance

What does this mean?

What are the Possible Causes of the DTC P099A?

Faulty Shift Solenoid 'G'
Shift Solenoid 'G' harness is open or shorted
Shift Solenoid 'G' circuit poor electrical connection

How to Fix the DTC P099A?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P099A code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P099A code?

Need more information on how to fix the P099A code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P099A code diagnosed by a professional: Find a repair shop in your area

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.