TCM Power Relay Sense Circuit Intermittent
The sense feedback from the TCM power relay drops out intermittently. Loose connector or oxidised relay contact.
Affected components
- Tcm power relay
- Wiring harness
- Tcm
Common causes
- High likelihood: Connector not seated
- Medium likelihood: Relay contact oxidised
- 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
- Reduced-power or limp mode may occur
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.