P0815Upshift Switch Circuit
- Generic OBD-II code · Powertrain
- How the car detects it
- Tap-up and tap-down switches let the driver choose gears on an automatic (selector gate, buttons or paddles). GM, Ford and Saab all treat a shift request that appears where it is impossible – in park or neutral, at Ford also reverse – or that stays on implausibly long as a stuck switch. P0815 is the upshift switch. GM's 2019 and 2025 tables set it when 'tap up' stays on for more than 1 s in P or N, or permanently in a drive range; the 2018 hybrid table uses 2 s in P/N and 655 s in drive; type C without MIL. Ford's 6R80 and 6F35 SelectShift report a switch closed in P, R or N without MIL. On Saab's 9-4X with the 6T70 a Hall switch feeds a resistor network on one wire: a short to positive sets P0815 or P0816, a short to ground or an open sets P0826. Manual shifting is then disabled.
- What you may notice
- Manual up shifting not working
- Transmission stays in the normal automatic mode
- No check engine lamp
- Likely causes
- LikelyTap switch or paddle sticking or faulty
- PossibleSignal wire shorted to positive
- PossibleSelector assembly (Hall sensor, resistor network) faulty
- RareClockspring or steering wheel wiring (paddles)
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.