Code P0793 reports a missing signal from the transmission intermediate shaft speed sensor. On the Mercedes B-Class 180 CDI with 722.8/M169 automatic transmission it appears together with code P0896 and shows up as erratic gear changes and reduced performance.
- System
- Transmission
- Component
- Automatic transmission control unit
- Fault
- Erratic, jerky gear changes, reduced performance and an ‘automatic transmission fault’ message on the instrument cluster.
- Typical symptoms
-
- Erratic, jerky gear changes
- Reduced performance
- ‘Automatic transmission fault’ message on the instrument cluster display
- Vehicles affected
-
- Mercedes B-Class 180 CDI 16v — vehicles with 722.8/M169 automatic transmission
- Main code
-
- P0793 Intermediate shaft or transmission speed sensor 1, missing signal
- Related codes
-
- P0896 Gear engagement time, too long
On this fault the diagnostic tool often returns several codes together.
- Solution
-
See the repair procedure verified on Sema Repair.
The cause and the repair are on Sema Repair
On Sema Repair this code is linked to verified case studies, with the confirmed cause case by case, the job step by step, indicative times, the manufacturer's notes and a photograph of the component with the point of intervention highlighted.