P0785Shift Timing Solenoid A
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 'Shift timing solenoid' means different parts: on GM's 4L60-E the 3-2 downshift solenoid that times the band apply on that downshift, on Aisin five-speeds (GM, Saab) the linear valve SLS that sets clutch pressure during the shift, and on the 2017–18 Genesis G80/G90 with shift-by-wire the on/off solenoids that engage drive (A) and reverse (B). P0785 is the general circuit code for solenoid A. GM's 2006 tables use it for the 3-2 downshift solenoid circuit (more than 43 of 50 failed counts, after one trip); Saab's 2002 Aisin box for an open or short in the SLS circuit with warning lamp and limp mode; Hyundai's Genesis bulletins for the drive solenoid, replacing valve and electronic module and then the module if it returns. Limp mode, harsh 3-2 downshifts or – on the Genesis – no drive follow.
- What you may notice
- Warning lamp
- Limp mode
- Harsh 3-2 downshift (GM) or rough shifts (Aisin)
- Genesis shift-by-wire: drive cannot be engaged
- Likely causes
- LikelySolenoid coil open or shorted
- PossibleConnector or wire at the transmission (oil, corrosion)
- PossibleElectronic module or transmission module driver
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €150 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.