Transmission Control System MIL Request Circuit High
Voltage on the transmission control system MIL request circuit is above the expected window. Wire shorted to B+ or driver open.
Affected components
- Mil request circuit
- Tcm
Common causes
- High likelihood: Wire shorted to B+
- Medium likelihood: Driver fault open
- Low likelihood: Connector pins corroded - high contact resistance
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.