P0905
Gate Select Position Circuit A Range/Performance
Transmission controls
Generic OBD-II
Medium
What it means
P0905 flags an out-of-range or implausible signal from the gate-select position sensor, used on automated-manual and dual-clutch transmissions to track which gear gate is selected. A bad reading can cause poor gear selection or limp mode. Wiring, the sensor, or the selection mechanism are the usual suspects. The engine starts and runs normally.
Medium
Can I keep driving? Sometimes reduced — the transmission may struggle to select gears or enter limp mode, so get it checked soon.
Common symptoms
What you'll notice
- Check-engine light on
- Difficulty selecting or engaging gears
- Erratic or inaccurate gear-position readout
- Transmission may enter limp mode
Common causes
Most likely first
- Faulty gate select position sensorLikely
- Wiring or connector fault in the gate-select circuitCommon
- Mechanical issue in the gear-selection mechanism or actuatorCommon
- Poor electrical connection or groundLess often
- Faulty transmission control module (TCM) — least likelyLess often
How to diagnose & fix
Work through it in order
- Confirm the code and inspect the gate select sensor and connector.
- Check the circuit wiring and ground for damage or corrosion.
- Compare the sensor's signal to actual selector position against spec.
- Verify the selection actuator/mechanism moves freely.
- Replace the sensor if confirmed faulty. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0905?+
The engine runs, but on automated transmissions gear selection can become unreliable or drop into limp mode. Get it checked soon, especially if gears are hard to engage.
Can I just clear P0905?+
It returns until the sensor, wiring, or selection mechanism is repaired.
Related codes
Often seen with P0905
Read & clear P0905 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX