P0955
Auto Shift Manual Mode Circuit
Transmission
Generic OBD-II
Low
What it means
P0955 means the transmission control module sees a fault in the circuit for the manual (tiptronic/sport) shift mode — the feature that lets you select gears yourself. The automatic transmission still works normally; you simply lose manual gear selection until the switch or its wiring is repaired.
Low
Can I keep driving? Yes — the transmission still shifts automatically; you just lose manual/tiptronic gear selection until it's fixed.
Common symptoms
What you'll notice
- Manual (tiptronic/sport) shift mode won't engage or respond
- Gear-position or mode display reads incorrectly
- Check-engine light on
Common causes
Most likely first
- Faulty or worn auto-shift manual-mode selector switchLikely
- Open, shorted, or chafed wiring in the manual-mode circuitCommon
- Loose or corroded connector terminals at the switch or moduleCommon
- Failed transmission control module (TCM)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and confirm the fault is in the manual-mode circuit, not a broader transmission code.
- Inspect the manual-mode selector switch and its connector for damage, wear, or corrosion.
- Check the wiring between the switch and the TCM for opens, shorts, or chafing; repair as needed.
- If wiring and switch test good, have the TCM diagnosed and reprogrammed or replaced.
FAQ
Quick answers
Is it safe to drive with P0955?+
Yes. The transmission still shifts automatically; only the manual gear-select feature is affected.
Can I just clear P0955?+
You can, but it returns until the switch or wiring fault is repaired.
Related codes
Often seen with P0955
Read & clear P0955 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