Transmission Fluid Deteriorated
The TCM detects deteriorated transmission fluid based on temperature exposure history or sensor measurement. Fluid change recommended.
Affected components
- Transmission fluid
Common causes
- High likelihood: Service interval overdue
- Medium likelihood: Repeated thermal stress
Possible 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
Diagnostic notes
- The malfunction indicator lamp may illuminate
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.