Transmission Range Control Module Communication Circuit High
Range control module communication line reads stuck high — bus shorted to battery voltage or open at the bus terminator.
Affected components
- Range control module
- Communication bus
Common causes
- High likelihood: Bus shorted to battery voltage
- Low likelihood: Gateway module routing CAN messages incorrectly
- Low likelihood: CAN terminating resistor (120 Ω) drifted out of spec
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
Related codes
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.