Cab Control Unit (CAB) Diagnostic Trouble Codes

Although the diagnostic codes listed below are not a complete list of the diagnostic trouble codes, they do reflect codes which may be observed while operating the tractor and have corrective action that the operator can take. Many codes which appear may be corrected simply by cycling key switch or by following the solution on the CommandCenter™ page, then cycling key switch.

If corrective action cannot be taken after cycling power to the tractor or if there are any questions, contact your John Deere™ dealer.

Cab Control Unit (CAB) Diagnostic Trouble Codes
Diagnostic Trouble Code	Display	Solution
CAB 158.4	Electrical System Voltage Low	Reduce electrical load or increase engine RPM to attempt vehicle system recovery.
CAB 523841.3	Operator Controls	Cycle brake or restart engine to attempt vehicle system recovery.
CAB 523841.4	Operator Controls	Cycle brake or restart engine to attempt vehicle system recovery.
CAB 523908.2	Operator Controls	Cycle PTO switch or restart engine to attempt vehicle system recovery.
CAB 523922.31	Secondary Brake On	Disengage brake or return vehicle to Neutral or Park.
CAB 524016.4	Operator Controls	Reduce electrical load or increase engine RPM to attempt vehicle system recovery.
CAB 524020.31	Lever not in park	Return lever to Park or Neutral.
CAB 524021.31	Operator Controls	Return to Park. Restart engine to attempt vehicle system recovery.