P2778Upshift Switch Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- How the car detects it
- P2778 is meant for an upshift switch signal that jumps around or drops out briefly instead of staying in one state. No manufacturer documents P2778 publicly. GM's 2023/2024 twin-clutch TCM and Ford's TR9070 split the same paddle input into low, high, implausible and stuck faults (P2775–P2777, P0815) but list no intermittent check, so on those cars a flickering contact will rather end up as one of these. CARB expects inputs to be watched for circuit and rationality faults, which is the frame this code fits. Practical causes are a clock spring with a cracked track that opens at certain wheel angles, a loose crimp in the column connector, or a worn paddle contact. Symptoms come and go: occasional ignored upshifts or unwanted gear requests.
- What you may notice
- Upshift requests occasionally ignored
- Occasional unwanted upshift requests
- Fault comes and goes, often depending on steering angle
- Likely causes
- LikelyClock spring track cracked, opening at certain steering angles
- PossibleLoose terminal or poor crimp in the column or wheel connector
- PossibleWorn or bouncing contact in the paddle
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.