P0786Shift Timing Solenoid A Range/Performance
- 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). P0786 means the circuit is intact but the solenoid does not reach its target current. GM's 2006 Aisin-type five-speed flags a deviation of more than 80 mA for 2.75 s at a steady commanded current above 835 mA, with 11–16 V and fluid above 20 °C, and lights the MIL at once. Rough shifts and limp mode follow; low and high circuit faults are P0787/P0788.
- What you may notice
- Rough shifts
- Warning lamp
- Limp mode
- Likely causes
- LikelyValve worn or coil resistance drifting
- PossibleContact resistance at the connector
- RareUnstable system voltage
- 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.