Code 55: Controller Fault
ABS module performs a self check for the following: ability of controller to execute valid instructions, Random Access Memory (RAM) integrity, Read Only Memory (ROM) integrity, and microprocessor wheel speed circuitry. If problem is detected, ABS operation will be disabled and ABS light will illuminate. See Fig 1 .
If Code 82 is also set, recalibrate ABS module. If only Code 55 is set, replace ABS module.