Transmission Range Control Module Communication Circuit
General fault on the communication line between the TCM and a separate transmission range control module (used on systems where the rotary/push-button selector lives in its own intelligent module that talks to the TCM via CAN or LIN).
Affected components
- Range control module
- Communication bus
Common causes
- High likelihood: Bus fault between modules
- Medium likelihood: Failed range control module
- Low likelihood: Gateway module routing CAN messages incorrectly
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.