P2776
Upshift Switch Circuit Low
Transmission
Generic OBD-II
Low
What it means
P2776 means the transmission controller sees an abnormally low voltage on the driver-operated upshift switch circuit — the button or lever used to request a manual upshift. It usually points to a short to ground, an open, or a failed switch. The car keeps driving and shifting automatically; the main effect is losing the manual upshift request.
Low
Can I keep driving? Yes — the car still drives normally; you may just lose the driver-operated upshift request until it's fixed.
Common symptoms
What you'll notice
- Check-engine light on
- Manual upshift requests are ignored or delayed
- Transmission stays in a lower gear or reverts to automatic mode
- Occasional unexpected or harsh shift
Common causes
Most likely first
- Short to ground or open in the upshift switch wiringLikely
- Failed or stuck upshift (tap-shift) switchCommon
- Corroded or damaged connector at the switchCommon
- Moisture or spilled liquid intrusion at the switchLess often
- TCM input fault (rare)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and wiggle-test the switch connector while watching the signal.
- Inspect the upshift switch and wiring for shorts to ground, corrosion, or moisture.
- Measure the switch signal voltage across its range against spec.
- Repair damaged wiring or the connector.
- Replace the upshift switch if it fails the range test, then clear and retest.
FAQ
Quick answers
Is it safe to drive with P2776?+
Generally yes — the transmission still shifts on its own. You mainly lose the manual upshift request until the switch or wiring is repaired.
Can I just clear P2776?+
You can, but it returns as soon as the switch is used again unless the circuit fault is fixed.
Related codes
Often seen with P2776
Read & clear P2776 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