John Deere Diagnostic Trouble Codes Overview

BCU Control Unit – The BCU is responsible for controlling the basic functions of the tractor and the rear hitch.The control unit receives and processes data and then makes this information available to other electronic control units. The following systems are also controlled:
• Acoustic alarm
• Speed-dependent engagement and disengagement of frontwheel drive (with frontwheel drive switch in AUTO position)
• Engagement of frontwheel drive when brakes are applied (with frontwheel drive switch in off position)
• Speed-dependent engagement and disengagement of differential lock
• Control of the rear PTO
• Control of the front PTO
• Speed-dependent turn signal deactivation
• Headland Management System (HMS)
• Alternator control
• Measurement of wheel speed
• Ground speed measurement
• Engine speed
• Signal socket
• Configuration of present worklights
• Control of draft link stabilizer
• Activates the vehicle CAN Bus and required control units in some cases

BCU fault codes

– The BCU is responsible for controlling the basic functions of the tractor and the rear hitch
john deere bcu codes The control unit receives and processes data and then makes this information available to other electronic control units.

ATC fault codes

– Automatic Temperature Control Unit
john deere atc codes The ATC is responsible for controlling the ClimaTrak automatic air conditioning system.

BIF fault codes

– The BIF control unit controls the display, indicators and instruments.
john deere bif codes The basic informator (BIF) records data via the vehicle CAN BUS, processes this data and converts it into meaningful information that can be displayed by the instruments and indicator lights.

DSM fault codes

– The DSM receives commands from the driver via the selection wheel and the keyboard and sends them to the DTI via the CAN Bus.
john deere dsm codes Depending on the equipment of the tractor, the keys are: