P0855Drive Switch Input Circuit High
- Generic OBD-II code · Powertrain
- Can trigger limp mode
- How the car detects it
- The drive switch input reports to the engine or gearbox module that range D is selected, usually through its own contact in the range switch or selector next to the park/neutral contact. No maker documents these codes; GM's tables up to 2025, Ford's summaries and Saab service data were searched. The description follows California's rule for inputs, circuit and plausibility checks, and the documented park/neutral input, which is checked against the gearbox module's range. P0855 means the D signal stays at a high level: an open wire with the pull-up lifting the input, a short to voltage or a contact that no longer closes.
- What you may notice
- Fault stored, MIL depending on maker
- Gear indicator wrong
- Cruise control not working
- Likely causes
- LikelySignal or ground wire open
- PossibleContact worn or misadjusted, does not close
- RareShort to voltage
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.