P0718
Input or Turbine Shaft Speed Sensor A Circuit Intermittent
Input or Turbine Shaft Speed Sensor A Circuit Intermittent: the signal is intermittent or erratic. Often a loose connector or chafed wiring; a wiggle test often locates it.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Common causes
Ordered by how often each turns out to be the cause.
- Intermittent contact at connectorCommon
- Connector with intermittent contact under vibrationLess likely
- Harness routed against vibrating componentLess likely
Parts involved
- Input Turbine Speed Sensor A
P0718 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.