P2793Gear Shift Direction Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2793 covers the circuit that reports the shift direction, the fore-and-aft movement along a lane that actually engages or releases a gear, as opposed to the sideways lane choice monitored by P2790. Depending on the design, an automated manual reads it from a sensor on the shift actuator, while shift-by-wire systems may take it from the lever or a separate selector module. The controller stores the circuit fault when the signal is absent or not valid at all; signals that are present but too low or too high set P2794 or P2795. No manufacturer documents P2793 publicly with set conditions; CARB 13 CCR 1968.2 requires such inputs to be checked for circuit integrity. If the controller cannot tell which way the shift is going, it usually stops shifting, keeps the engaged gear and turns on the warning lamp.
- What you may notice
- No up- or downshifts, gearbox keeps the current gear
- Selector input ignored
- Warning lamp and transmission message
- Likely causes
- LikelyOpen circuit or poor contact at the shift direction sensor connector
- PossibleFailed shift direction sensor on the actuator
- PossibleFaulty shift lever or selector module where it sends the signal
- RareTransmission controller input fault
- 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 – €1,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.