P2768
Input/Turbine Shaft Speed Sensor B Circuit Intermittent
The second input shaft speed sensor signal jumps or drops out intermittently. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Sensor connector not fully seatedCommon
- Harness chafed against transmission housingPossible
- Connector with intermittent contact under vibrationLess likely
Parts involved
- Input Shaft Speed Sensor B
- Wiring Harness
P2768 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.