P2794Gear Shift Direction Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2794 means the shift direction signal, which tells the controller whether a gear is being pushed in or pulled out along its lane, reads lower than the permitted minimum. The usual suspects are a signal line rubbed through to ground, a collapsed sensor supply shared with other sensors, or water in a connector creating a leakage path to ground. Because the same supply often feeds several gearbox sensors, other low-voltage codes stored at the same time point to the supply rather than this sensor. No manufacturer documents P2794 publicly with thresholds; the test is one of the range checks CARB 13 CCR 1968.2 sets for transmission inputs. P2793 covers a missing or invalid signal and P2795 the opposite limit. With this fault the gearbox normally freezes the gear in use.
- What you may notice
- Gearbox stays in the current gear
- Manual shift requests ignored
- Transmission warning lamp
- Likely causes
- LikelySignal line chafed through to ground
- PossibleShared sensor supply pulled down by another sensor or wiring
- PossibleMoisture or corrosion in the connector
- RareShift direction sensor failed low
- 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: €50 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.