DTC U0100-87: Lost Communication With ECM/PCM A - Missing message: Action
- Refer to the appropriate system wiring diagrams and check the powertrain control module power and ground circuits for open circuit, high resistance. Repair the wiring harness as necessary
- Refer to the appropriate system wiring diagrams and check the FlexRay bus circuit for short circuit to ground, short circuit to power, open circuit, high resistance. Repair the wiring harness as necessary
- Using the manufacturer approved diagnostic system, check the powertrain control module for related DTCs and refer to the relevant DTC index