P0826Up and Down Shift Switch Circuit
- Generic OBD-II code · Powertrain
- How the car detects it
- Many selectors read tap-up and tap-down over one shared wire with voltage steps or a resistor network; P0826–P0828 cover this shared circuit, P0815/P0816 the single directions. P0826 is the general fault of the shared circuit. GM (6L80 in 2011, 2019, 2025, hybrids) sets it when the circuit shows an invalid voltage for at least 60 s with 8.6–32 V and 400–7500 rpm, without MIL. On Saab's 9-4X with the 6T70 a short to ground or an open sets P0826. Saab's 2003–04 9-3 Sentronic reports below 0.2 V or above 6.7 V for over 30 s under P0826 with a fault-type byte, lights 'Check gearbox' and locks the lever in P/N. Ram's 2025 heavy-duty trucks set it with P0827 and P085F and the MIL, fixed with transmission software. Manual shifting is then disabled.
- What you may notice
- Tap or manual shifting not working
- Transmission runs only in automatic mode
- Transmission warning; lever locked in P/N (Saab 9-3)
- Likely causes
- LikelyWire or connector between selector and module open or shorted
- LikelySelector assembly (Hall switch, resistor network, module) faulty
- PossibleTransmission module software (Ram)
- RareClockspring or steering wheel wiring (paddles)
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.