Engine Control Unit (ECU) Service Codes

Symptom Problem Solution

CODE ECU 13, 14, 15

Throttle position communication between Chassis Control Unit (CCU) and ECU - No harm to engine

Have your John Deere Dealer repair

Engine will only idle

Have your John Deere Dealer repair

CODE ECU 25, 26

Engine coolant temperature sensor voltage out of range

Have your John Deere Dealer repair

ECU high coolant temperature engine protection feature disabled

Have your John Deere Dealer repair

Possible engine power changes, hard or smoky starting - No harm to engine

Have your John Deere Dealer repair

CODE ECU 27, 29

Fuel pressure sensor voltage out of range

Have your John Deere Dealer repair

ECU high and low fuel pressure engine protection feature disabled

Have your John Deere Dealer repair

CODE ECU 28

ECU error

Have your John Deere Dealer repair

CODE ECU 31, 91

Cylinder 1 Electronic Unit Injector (EUI) circuit fault

Have your John Deere Dealer repair

Engine misfire - Possible power changes

Have your John Deere Dealer repair

CODE ECU 32, 92

Cylinder 2 Electronic Unit Injector (EUI) circuit fault

Have your John Deere Dealer repair

Engine misfire - Possible power changes

Have your John Deere Dealer repair

CODE ECU 33, 93

Cylinder 3 Electronic Unit Injector (EUI) circuit fault

Have your John Deere Dealer repair

Engine misfire - Possible power changes

Have your John Deere Dealer repair

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Symptom Problem Solution

CODE ECU 34, 94

Cylinder 4 Electronic Unit Injector (EUI) circuit fault

Have your John Deere Dealer repair

Engine misfire - Possible power changes

Have your John Deere Dealer repair

CODE ECU 35, 95

Cylinder 5 Electronic Unit Injector (EUI) circuit fault

Have your John Deere Dealer repair

Engine misfire - Possible power changes

Have your John Deere Dealer repair

CODE ECU 36, 96

Cylinder 6 Electronic Unit Injector (EUI) circuit fault

Have your John Deere Dealer repair

Engine misfire - Possible power changes

Have your John Deere Dealer repair

CODE ECU 37, 38

Fuel temperature sensor voltage out of range

Have your John Deere Dealer repair

Possible engine power changes - Hard or smoky starting - No harm to engine

Have your John Deere Dealer repair

CODE ECU 41, 42, 43, 44, 45

Engine position sensor circuit fault

Have your John Deere Dealer repair

Erratic engine operation - Hard to start or will not start

Have your John Deere Dealer repair

CODE ECU 57

Fuel filter restricted

Change fuel filter

Fuel supply pressure lower than normal

Have your John Deere Dealer repair

CODE ECU 58

Fuel filter plugged

Change fuel filter

Fuel supply pressure extremely low - Engine damage possible

Have your John Deere Dealer repair

CODE ECU 59

Fuel supply pressure higher than normal

Have your John Deere Dealer repair

CODE ECU 62

Engine coolant temperature moderately high

Check for radiator air flow restriction, reduce engine load, have your John Deere Dealer repair

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Symptom Problem Solution

CODE ECU 63

Engine coolant temperature extremely high - Engine damage possible

Stop engine, have your John Deere Dealer repair

CODE ECU 75

Water in fuel detected - Engine damage possible

Drain water separator. If problem persists have your John Deere Dealer repair

CODE ECU 76

Water in fuel sensor voltage out of range

Have your John Deere Dealer repair

ECU water in fuel engine protection feature disabled

Have your John Deere Dealer repair

CODE ECU 84

Potential drain on vehicle battery

Have your John Deere Dealer repair

CODE ECU 97

Electronic Unit Injector (EUI) circuit fault

Have your John Deere Dealer repair

Engine misfire - Possible power changes - Hard to start or will not start

Have your John Deere Dealer repair

CODE ECU 98

Electronic Unit Injector (EUI) circuit fault

Have your John Deere Dealer repair

Engine misfire - Possible power changes - Hard to start - Excessive black or gray exhaust smoke

Have your John Deere Dealer repair

CODE ECU 99

Electronic Unit Injector (EUI) circuit fault

Have your John Deere Dealer repair

Engine misfire, erratic operation, possible power changes, hard to start or will not start, excessive black smoke

Have your John Deere Dealer repair

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