P07F1
Input/Turbine Shaft Speed Sensor C Circuit
General electrical fault on input/turbine speed sensor C — third input speed sensor in heavy-duty or hybrid-coupled transmissions.
- 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.
- Open or shorted wiringCommon
Parts involved
- Input Shaft Speed Sensor C
- Sensor Wiring
P07F1 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.