General Motors Powertrain

556-RTI 3

UnclassifiedFuel

What This Code Means

MIL on until code is cleared by technician; Adaptive disabled for the remainder of the key-on cycle; Power Derate (level 2 enforced); Maximum throttle position restricted to 20%; ECM resets itself

Possible Causes

  • •Internal microprocessor error
  • •Loss of ECM microprocessor RAM

Suggested Actions

  1. 1Erase code after diagnosis by removing battery power
  2. 2Manually clear fault code

Related General Motors Powertrain Fault Codes

633652515DTC 412514-RTI 1DTC 425DTC 433P0300P0336611632
Browse all General Motors Powertrain fault codes

ASK RUDY ABOUT THIS FAULT

Get a diagnosis walkthrough for 556-RTI 3 on your specific General Motors Powertrain unit — cited to the OEM manual, not a forum guess.

GET THE ANSWER

Free account required — we'll bring your question with you.