P0615-81: Starter Relay Circuit - Invalid serial data received: Action
- Check engine control module for additional DTCs and refer to relevant DTC index. Rectify these first
- Refer to the applicable SYSTEM WIRING DIAGRAM(S) and check the power and ground connections to the module
- Using the manufacturer approved diagnostic system check and install latest relevant level of software to the engine control module
- Using the manufacturer approved diagnostic system clear all stored DTCs using the `Diagnosis Menu' tab and retest
- Check and install a new engine control module as required