P2777Upshift Switch Circuit High
- Generic OBD-II code · Powertrain
- How the car detects it
- P2777 is the over-voltage counterpart for the upshift switch. GM's 2023 twin-clutch TCM watches the TAPUP input and counts up a timer once it exceeds 4.774 V; after 150 ms above that limit, with supply voltage in the 8.75–18 V band, the code is logged as Type C, so no MIL. Ford's July 2024 OBD summary lists P2777 as out-of-window-high on the TR9070 upshift paddle. Because the released paddle already rests near the top of the range, an open signal circuit, a missing switch ground or a disconnected steering wheel plug pushes the reading over the limit quickly. A short to battery voltage is less common. P2776 is the opposite case, P2775 the implausible but in-range one. The paddle does nothing until the circuit is repaired.
- What you may notice
- Upshift paddle without function
- Driver information message about manual shifting
- Likely causes
- LikelyOpen signal or ground circuit, steering wheel connector loose
- PossibleBroken track in the clock spring
- RareSignal wire shorted to a voltage source
- Repair
- Medium · Usually a job for a workshop.Typical cost: €40 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.