P097AShift Solenoid A Control Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Open-circuit fault in the drive circuit of shift solenoid A, a code that later J2012 editions added; older lists still show P097A as reserved. GM is the only maker found that documents it: the 2022 to 2025 tables for the Allison 1000 six-speed in its heavy-duty trucks call it Shift Solenoid 1 Control Circuit Open. After one hardware fault the module flags pending, and after three samples it opens the low-side driver as a test; three more open readings at 9 to 18 V set the code (120 ms, MIL after one trip). The same gearbox once used P0972 for this and P0973 in 2016. Ford reports an open SSA as P0750, GM six-speeds as P0974, and Genesis folds all electrical faults of A into P0753.
- What you may notice
- MIL on after one faulty trip
- Transmission in a fixed default gear
- Shifts involving solenoid A missing
- Likely causes
- LikelyOpen coil of shift solenoid 1/A
- LikelyUnplugged, corroded or pushed-out pin at the transmission connector
- PossibleBroken wire in the internal or external transmission harness
- RareFaulty low-side driver in the control module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.