P0828Up and Down Shift Switch Circuit High
- 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. P0828 means the shared circuit voltage is too high – a short to positive, or on ground-switching switches with a pull-up also an open. No manufacturer document available to us uses it: Saab's 9-3 Sentronic reports this state as P0826 (above 6.7 V for more than 30 s), Saab's 9-4X as P0815 or P0816, and GM as P0826. Manual shifting would be disabled while automatic operation stays normal.
- What you may notice
- Tap or manual shifting not working
- Transmission warning in the cluster
- No effect on driving in automatic mode
- Likely causes
- LikelySignal wire shorted to positive
- PossibleSignal wire or selector ground open (pulled-up input)
- PossibleSelector assembly faulty
- RareControl module
- 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.