Starter Relay B Stuck On
The second starter relay stays closed when commanded off. Starter motor B remains engaged after the engine is running, which can destroy the starter pinion or ring gear.
Affected components
- Starter relay b
- Starter motor b
Common causes
- High likelihood: Relay contacts welded shut by inrush current
- Medium likelihood: ECU output driver stuck on
- Low likelihood: Carbon or debris buildup preventing free movement
Diagnostic notes
- The malfunction indicator lamp may illuminate
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.