TCM Power Input Signal Intermittent
The TCM detects intermittent loss of main supply voltage above a threshold count. Often caused by loose connector or relay fault.
Affected components
- Tcm
- Tcm relay
- Wiring harness
Common causes
- High likelihood: TCM power relay intermittent
- Medium likelihood: Power connector loose
- Low likelihood: Connector with intermittent contact under vibration
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.