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 at earliest convenience

CODE CCU 5

Engine oil pressure input sensor is out of range low.

Have your John Deere Dealer repair at earliest convenience

CODE CCU 7

ECU does not match tractor model

Have your John Deere Dealer repair as soon as possible

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 at earliest convenience

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

CODE CCU 17, 18

Hydraulic oil temperature input open circuit or shorted

Have your John Deere Dealer repair as soon as possible

AG,RX15494,2907 -19-07FEB00-1/5

CODE CCU 19

Hydraulic oil temperature low (throttle speed limited)

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

CODE CCU 20, 21

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 22

Engine oil pressure switch open circuit

Have your John Deere Dealer repair as soon as possible

CODE CCU 23

Engine speed signal missing

Have your John Deere Dealer repair at earliest convenience

CODE CCU 24

Clean oil reservoir level switch open circuit

Have your John Deere Dealer repair as soon as possible

CODE CCU 26

Transmission oil pressure low (Warning)

Check transmission oil level and filter

CODE CCU 27

Park brake pressure switch open circuit

Have your John Deere Dealer repair at earliest convenience

CODE CCU 30

Engine air filter restricted (Warning)

Clean or replace filter (See Clean and Inspect Primary Engine Air Filter in General Maintenance and Inspection Section)

AG,RX15494,2907 -19-07FEB00-2/5

CODE CCU 45, 46

Low voltage or excessive electrical load (Warning)

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

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

Reduce electrical load

Have your John Deere Dealer check charging system

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 as soon as possible

CODE CCU 50

Hydraulic oil filter restricted (Warning)

Change transmission-hydraulic oil filter

CODE CCU 59

Ground-driven pump pressure low

Have your John Deere Dealer repair as soon as possible

CODE CCU 62

Clean oil reservoir level low (Warning)

Add transmission-hydraulic oil (See Check Transmission-Hydraulic Oil Level in Lubrication Section)

CODE CCU 63

Clean oil reservoir level low
(STOP ENGINE)

Add transmission-hydraulic oil (See Check Transmission-Hydraulic Oil Level in Lubrication Section)

CODE CCU 67

Electrical sensor or circuit

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

Have your John Deere Dealer repair as soon as possible

AG,RX15494,2907 -19-07FEB00-3/5

CODE CCU 68

PTO overspeed (Warning)

Reduce engine speed (See PTO operating recommendations in Drawbar and PTO Section)

CODE CCU 69

PTO disabled in 4R

Shift to 3R, switch off PTO and then back on

CODE CCU 70

Operator out of seat with PTO engaged (Warning)

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

CODE CCU 71

PTO disabled if switch on at start-up

Switch off PTO and back on (See Operating PTO in Drawbar and PTO Section)

CODE CCU 72, 73

PTO disabled, PTO circuit failure

Have your John Deere Dealer repair at earliest convenience

CODE CCU 75

PTO disabled, PTO slipping or speed sensor failure

Reduce load (See Operating the PTO in Drawbar and PTO Section)

Switch off PTO and back on

Have your John Deere Dealer repair at earliest convenience

CODE CCU 76

PTO calibration error

Have your John Deere Dealer calibrate as soon as possible

CODE CCU 80

Differential lock on at start-up

Operate switch (See Using Differential Lock in Operating the Tractor Section)

Have your John Deere Dealer repair at earliest convenience, if light remains on

CODE CCU 81

Differential lock disabled, circuit failure

Have your John Deere Dealer repair at earliest convenience

CODE CCU 85, 86

MFWD circuit failure

Have your John Deere Dealer repair at earliest convenience

CODE CCU 88

Intake manifold temperature high (Warning)

Clean grille, side screens and radiator

AG,RX15494,2907 -19-07FEB00-4/5

CODE CCU 89, 92

Intake manifold air temperature high (STOP ENGINE)

Clean grille, side screens and radiator

CODE CCU 90, 91

Intake manifold air temperature open circuit or shorted

Have your John Deere Dealer repair as soon as possible

CODE CCU 95

Hand throttle command missing

Check fuse F3

Have your John Deere Dealer repair as soon as possible

CODE CCU 96, 97

Foot throttle input open circuit or shorted

Have your John Deere Dealer repair at earliest convenience

CODE CCU 98

Engine oil pressure switch failed closed with engine OFF

Have your John Deere Dealer repair as soon as possible

CODE CCU 100

Park brake pressure switch failed closed

Have your John Deere Dealer repair as soon as possible, if not in tow mode

Transmission in tow mode with park brake pumped off

Normal in tow mode (See Towing Tractor in Transport Section)

CODE CCU 125

Both turn signal switches active at same time

Have your John Deere Dealer repair as soon as possible

AG,RX15494,2907 -19-07FEB00-5/5