John Deere 4120 Tractor Error Codes | JohnDeereErrorCode.com

John Deere 4120 Tractor Error Codes

Model : 4120

Common Engine Error Codes For 4120 JD Tractors


Types Of John Deere Faults

ACUArmrest Control Unit Diagnostic Trouble Codes
ASUActiveSeat Unit Diagnostic Trouble Codes
TECTractor Equipment Control Unit Diagnostic Trouble Codes
CDCClimaTrak Display Codes
BRCFront Brake Control Unit Diagnostic Trouble Codes
CABCab Control Unit Diagnostic Trouble Codes
CCUCentral Control Unit Diagnostic Trouble Codes
CLCCab Load Center Diagnostic Trouble Codes
ECUEngine Control Unit Diagnostic Trouble Codes
HCUHitch Control Unit Diagnostic Trouble Codes
ICUInstrument Control Unit Diagnostic Trouble Codes
PTFFront PTO Control Unit Diagnostic Trouble Codes
IVTIVT Transmission Control Unit Diagnostic Trouble Codes
PTQPowrQuad Plus Transmission Control Unit Diagnostic Trouble Codes
SCOOptional SCV Control Unit Diagnostic Trouble Codes
SCUSCV Control Unit Diagnostic Trouble Codes
SFATriple-Link Suspension Control Unit Diagnostic Trouble Codes
SSUAutoTrac Steering System Control Unit Diagnostic Trouble Codes
TECTractor Equipment Control Unit Diagnostic Trouble Codes
VLCVehicle Load Center Control Unit Diagnostic Trouble Codes
BCUJohn Deere BCU Fault Codes
EPCJohn Deere EPC Fault Codes
ETCJohn Deere ETC Fault Codes
HTCJohn Deere HTC Fault Codes
JDLJohn Deere JDL Fault Codes
PLCJohn Deere PLC Fault Codes

Customer access; recall, record, and clear diagnostic trouble codes:

Press and hold the roll mode switch for 5 seconds to begin diagnostic session. Upon entering diagnostics, any active or previously active codes automatically appear in a scrolling fashion with each one showing the control unit (3 letter abbreviation) and the code number (XXXXXX.XX). To view and/or clear diagnostic trouble codes for any given control unit, do the following:

  1. Use the right turn signal switch to scroll to the desired control unit.
  2. Press and release the roll mode switch to enter the diagnostic addresses for that desired control unit.
  3. Use the right turn signal switch to scroll to diagnostic address 001 for that desired control unit.
  4. If codes are present the word "codes" appears. If not, the word "none" appears.
  5. Press and release the roll mode switch to view all code details for this control unit.
  6. Any codes present in that control unit appears there in scrolling fashion for multiple codes.
  7. To access the option for clearing codes for this selected control unit, press and release the right turn signal switch.
  8. The question "CLR ?" appears.
  9. To clear the codes, press and release the roll mode switch.
  10. To go back to the entire control unit list, press and release the left turn signal switch.


John Deere Tractors And Error Codes

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