Rehlko

I/O MODULE COMMUNICATIONS LOST

UnclassifiedGeneral

What This Code Means

Service Required LED flashes; Communication to previously working I/O module is lost

Possible Causes

  • •An I/O module that was previously installed and working is lost
  • •Communication to I/O module lost

Suggested Actions

  1. 1Check diagnostic LED
  2. 2Check the I/O module connections
  3. 3Check the diagnostic LED

Related Rehlko Fault Codes

I/O MODULE NOT FOUNDINTERN ERROR SHUTDWNHWTL WTHIGH ENGINE TEMPERATURELED4HIGH BATTERY VOLTAGELFHETLO CRANK VLT WGROUND FAULT WARNINGLOCKED ROTOR SD
Browse all Rehlko fault codes

ASK RUDY ABOUT THIS FAULT

Get a diagnosis walkthrough for I/O MODULE COMMUNICATIONS LOST on your specific Rehlko unit — cited to the OEM manual, not a forum guess.

GET THE ANSWER

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