Communication System Diagnostics

Before proceeding to communication DTC tables to diagnose a communication DTC:

• Review vehicle equipment level.
• Make note of modules and systems vehicle is equipped with.
• Ensure DTC being diagnosed is referencing a module or system vehicle is equipped with.
• New Generation Star (NGS) scan tester may produce a communication DTC for no communication if vehicle is not equipped with suspect module or system.
• New Generation Star (NGS) scan tester will interpret a not equipped module as a communication failure.
• If a DTC is retrieved for a module or system vehicle is not equipped with, disregard this DTC.
• If the only communication DTC retrieved is for a module or system vehicle is not equipped with, self-test is considered passed.