P0793
Intermediate Shaft Speed Sensor A Circuit No Signal
Intermediate shaft speed sensor A is connected and powered, but no rotation pulses arrive while the transmission is in motion. Either the sensor reluctor wheel is damaged, the sensor air gap is wrong, or the element has failed open.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
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.
- Failed sensor element (open)Common
- Damaged reluctor wheelPossible
Parts involved
- Intermediate Shaft Speed Sensor A
- Reluctor Wheel
P0793 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.