Central Control Unit (CCU) Service Codes

CODE CCU 1

Fuel level input open circuit or shorted to more than 12 volts

Have your John Deere Dealer repair

CODE CCU 4

Fuel flow signal missing (Warning)

Fill fuel tank (See Fuels, Lubricants, and Coolant Section)

Have your John Deere Dealer check injection system

CODE CCU 5

Engine oil pressure input sensor is out of range low

Have your John Deere Dealer repair

CODE CCU 7

ECU does not match tractor model

Have your John Deere Dealer repair

CODE CCU 9

Seat switch stuck closed

Have your John Deere Dealer repair

CODE CCU 10

Coolant temperature high (Warning)

Check coolant level, fan belt, and radiator and hoses for leaks

Clean grille, side screens, radiator and oil cooler

Reduce load or shift to lower gear

CODE CCU 11

Coolant temperature high
(STOP ENGINE)

Check coolant level, fan belt, and radiator and hoses for leaks

Clean grille, side screens, radiator and oil cooler

Reduce load or shift to lower gear

CODE CCU 12, 13

Coolant temperature input open circuit or shorted

Have your John Deere Dealer repair

CODE CCU 15

Hydraulic oil temperature high (Warning)

Check oil level and filter

Clean grille, side screens, radiator and oil cooler

CODE CCU 16

Hydraulic oil temperature high (STOP ENGINE)

Check oil level and filter

Clean grille, side screens, radiator and oil cooler

AG,RW24911,145 -19-30AUG00-1/4

CODE CCU 17, 18

Hydraulic oil temperature input open circuit or shorted

Have your John Deere Dealer repair

CODE CCU 19

Hydraulic oil temperature low (throttle speed limited)

Operate tractor at idle speed until oil warms up or warm transmission-hydraulic oil (See Transmission-Hydraulic System Warm-Up in the Operating the Tractor Section)

CODE CCU 20

Engine oil pressure low
(STOP ENGINE)

Check oil level

Incorrect type of oil

Drain, fill crankcase with correct oil (See Engine Oil in Fuels, Lubricants and Coolant Section)

CODE CCU 23

Engine speed signal missing

Have your John Deere Dealer repair

CODE CCU 24

Clean oil reservoir level switch open circuit

Have your John Deere Dealer repair

CODE CCU 26

Transmission oil pressure low (Warning)

Check transmission oil level and filter

CODE CCU 29

Axle lube pump pressure switch open circuit

Have your John Deere Dealer repair

CODE CCU 30

Engine air filter restricted (Warning)

Clean or replace filter (See Service Air Cleaner in the General Maintenance and Inspection Section)

CODE CCU 45, 46

Low voltage or excessive electrical load (Warning)

Check battery (See Service Batteries in the General Maintenance and Inspection Section)

Check belt tensioner (See Check Belt Tensioner in the General Maintenance and Inspection Section)

Reduce electrical load

Have your John Deere Dealer check charging system

AG,RW24911,145 -19-30AUG00-2/4

CODE CCU 47

High voltage (Warning)

Replace voltage regulator

Have your John Deere Dealer check charging system

CODE CCU 49

High voltage (STOP ENGINE)

Replace voltage regulator

Have your John Deere Dealer check charging system

CODE CCU 50

Hydraulic oil filter restricted (Warning)

Change transmission-hydraulic oil filter

CODE CCU 51

Transmission oil filter restricted (Warning)

Change transmission oil filter

CODE CCU 52

Axle lube filter restriction

Change axle oil filter

CODE CCU 53

Transmission Hi-Lo solenoid circuit (Warning)

If operating Hi-Lo in Lo, bump shift to Hi

CODE CCU 61

Hydraulic oil reservoir level low (STOP ENGINE)

Add transmission-hydraulic oil. (See Check Transmission and Hydraulic Oil Level the Lubrication Section)

CODE CCU 64

Axle lube pressure low (STOP ENGINE)

Add transmission-hydraulic oil. (See Check Axle Oil Level in the Lubrication Section)

CODE CCU 65

Axle lube pressure low (Warning)

Add transmission-hydraulic oil. (See Check Axle Oil Level in the Lubrication Section)

Operate engine with transmission in PARK/NEUTRAL at 2100 rpm at least 5 minutes to warm oil

CODE CCU 67

Electrical sensor or circuit

Check fuse F14 (See Load Center Fuses in the Maintenance-Electrical System Section)

Have your John Deere Dealer repair

AG,RW24911,145 -19-30AUG00-3/4

CODE CCU 70

Operator out of seat with PTO engaged (Warning)

If not stationary PTO use, return to seat or turn off PTO before leaving cab (See Operator Presence Sensor in the Operator Station Section)

CODE CCU 75

Clutch is slipping for excessive time or load

Avoid riding clutch pedal

CODE CCU 95

Hand throttle command missing

Check fuse F3

Have your John Deere Dealer repair as soon as possible

CODE CCU 101

Axle lube pressure switch failed closed

Have your John Deere Dealer repair

CODE CCU 120, 121, 122, 125

Controller fault

Have your John Deere Dealer repair

AG,RW24911,145 -19-30AUG00-4/4