OBD-II code · Powertrain (generic)
P0791 Intermediate Shaft Speed Sensor A Circuit
The TCM detects an electrical fault on the intermediate shaft speed sensor A circuit. Used to compute shift slip and torque converter behavior.
Is it safe to drive with P0791?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySpeed sensor failed
- PossibleWiring open or shorted
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
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Intermediate Shaft Speed Sensor, Wiring Harness
Related codes
- P2745Intermediate Shaft Speed Sensor B Circuit
- P2749Intermediate Shaft Speed Sensor C Circuit
- P078EShift Timing Solenoid B Intermittent
- P078FTransmission Mode Switch C Circuit
- P0790Normal/Performance Switch Circuit
- P0792Intermediate Shaft Speed Sensor A Circuit Range/Performance
- P0793Intermediate Shaft Speed Sensor A Circuit No Signal
- P0794Intermediate Shaft Speed Sensor A Circuit Intermittent
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.