TCM Power Input Signal Range/Performance
The power input signal to the Transmission Control Module is outside the calibrated tolerance. Supply or wake-up signal drift.
Affected components
- Tcm
- Wiring harness
Common causes
- High likelihood: Supply voltage drifted
- Medium likelihood: High-resistance contact
- Low likelihood: Sensor element aged beyond calibration window
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.