P097CShift Solenoid C 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 C. GM documents it for the Allison 1000 six-speed in its 2022 to 2025 heavy-duty tables as Shift Solenoid 3 Control Circuit Open, with the same intrusive low-side test as SS1 and SS2: three samples, 120 ms, battery 9 to 18 V, MIL after one trip. It is the youngest of three codes for this one fault on that gearbox: 2007 used P0978, only outside reverse trim, 5th and 6th gear, 2016 merged it into P0979 with a 200 kOhm limit. Ford reports an open SSC under P0760, and no other maker was found using P097C. A related pressure switch code may set too, because SS3 strokes the S3 valve that switch PS3 watches.
- What you may notice
- MIL on after one faulty trip
- Upper gears unavailable or fixed default gear
- Possible additional pressure switch code
- Likely causes
- LikelyOpen coil of shift solenoid 3/C
- LikelyLoose, wet or corroded pin in the transmission connector
- PossibleBroken wire between module and solenoid C
- 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.