P2776Upshift Switch Circuit Low
- Generic OBD-II code · Powertrain
- How the car detects it
- P2776 means the upshift switch input has dropped below the lowest voltage the module accepts. In GM's 2023 twin-clutch TCM the TAPUP input is supposed to stay above 2.519 V even with the paddle pulled; a lower reading, held for at least 150 ms with battery voltage between 8.75 and 18 V and the engine not cranking, sets P2776 as Type C without MIL. Ford's 2024 TR9070 summary assigns P2776 to the out-of-window-low case of the upshift paddle. A low reading normally means the signal wire is touching ground, for example chafed at the clock spring, or the switch is shorted inside. Compared with P2775 the value is clearly outside the band, and P2777 is the mirror image. Tap upshifts stop working while normal automatic driving continues.
- What you may notice
- Upshift paddle or tip function inoperative
- Manual mode message, no check engine light on GM
- Likely causes
- LikelySignal wire shorted to ground, e.g. in the clock spring area
- PossiblePaddle switch shorted internally
- RareLiquid in switch or connector creating a leak path to ground
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.