AIC 521133.31 – CommandQuad™ Range Switches Conflict. John Deere AIC System Alert.

AIC 521133.31 (AIC )

Code: 521133.31



This error code, AIC 521133.31, occurs when there is a conflict involving the CommandQuad™ range switch B, which is mistakenly detected as being pressed along with one or more other range switches. This simultaneous activation can lead to ambiguous or incorrect gear selection signals within the transmission system, potentially causing operational hazards.


To mitigate potential risks and prevent transmission damage, the control unit has automatically engaged a recoverable PARK position, temporarily disabling movement until the conflict is resolved.


  • Thoroughly inspect range switch B and adjacent range switches for mechanical faults that could cause them to stick in the pressed position. Look for physical obstructions, excessive dirt, or wear that could affect switch operation.
  • Use diagnostic equipment to individually test the functionality of each implicated switch. Ensure that they are correctly registering pressed and unpressed states without interference.
  • Examine the electrical wiring and connectors for each switch involved in the conflict for potential shorts or disconnections that could lead to erroneous signals.
  • Replace any faulty switches or repair any identified issues within the electrical circuit to ensure accurate communication between the switches and the transmission control unit.
  • Once the necessary repairs are made, recalibrate the affected switches and perform a comprehensive system check to ensure all transmission functions are operating correctly and that the vehicle can safely exit the PARK position.


Regular checks and prompt attention to any issues with transmission range switches are vital for the safe and efficient operation of machinery. Addressing such conflicts quickly helps maintain operational reliability and prevents the occurrence of more serious mechanical issues.