From Ross-Tech Wiki

16989/P0605/001541 - Internal Control Module: ROM Error

Possible Symptoms

  • Malfunction Indicator Light (MIL) ON

Possible Causes

  • Control Module faulty
    • Internal Fault in Control Module/Processor

Possible Solutions

  • Check/Replace Control Module

Special Notes

  • Fault Codes like this can usually not be repaired since they are stored after the Control Module did not pass it's internal Self Test. Even though the official Repair Manuals suggest replacing the Control Module in such a case, there may be specialized Companies repairing Modules like this.