P09A0: Shift Solenoid G Control Circuit/Open

Open circuit or general circuit fault in the drive of shift solenoid G. It is a late addition to J2012: older code lists still show P09A0 to P09FF as reserved. No manufacturer was found to document it. The known users of the G block send opens elsewhere: Mitsubishi's 2019 six-speed reports an open low-reverse brake shift solenoid as P099C, Nissan's RE0F11A CVT lists only P099B/P099C, and Hyundai/Genesis use P075A and P075D for their on/off solenoid G. Ford shows the usual split for solenoids A to E, with the open in the base code (P0750 and so on) and separate ground and power shorts. CARB requires every transmission output to be checked for circuit continuity. P099A to P099C are performance, low and high.

Symptoms

• Check engine light
• Limp mode or missing gears

Most likely causes

• Broken control wire or unplugged connector
• Open solenoid coil
• Pin backed out of the connector housing

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the fluid level and condition according to the manufacturer
2. Check the continuity of the wire between the component and the control module.
3. Check the transmission connector
4. Read the data with a transmission-compatible scanner
5. Measure the solenoid valve circuit
6. Leave opening the transmission to a specialized repair shop

Good to know

• Repair difficulty: hard
• It can trigger limp mode.
• It affects emissions.

What each character of P09A0 means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• 9: Transmission
• A0: Specific fault in that system

Frequently asked questions

Can I keep driving with code P09A0?

Drive as little as possible and gently. If the transmission slips or stays in one gear, go slowly to a repair shop or call for a tow truck.

What causes code P09A0?

The most common causes are: broken control wire or unplugged connector; open solenoid coil; pin backed out of the connector housing.

Related codes

• P099AShift Solenoid G Control Circuit Range/Performance
• P099BShift Solenoid G Control Circuit Low
• P099CShift Solenoid G Control Circuit High
• P09A1Shift Solenoid H Control Circuit/Open
• P097FShift Solenoid F Control Circuit/Open
• P075AShift Solenoid G

Sources

• law.cornell.edu: 13 CCR 1968.2
• mitsubishitechinfo.com: M123104210002100USA
• fordservicecontent.com: OBD Operations Summary Gasoline 2020 2023

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.