Service Codes on Transmission Control Unit (TCU)
Symptom Problem Solution

CODE 19

Fault at clutch pedal

See your John Deere dealer.

CODE 20

Fault in enable circuit

See your John Deere dealer.

CODE 24

Hydraulic oil temperature circuit defective

See your John Deere dealer.

CODES 32, 33

Fault at operating voltage of TCU

See your John Deere dealer.

CODE 34

Fault at clutch pedal

See your John Deere dealer.

CODE 40

Hydraulic oil temperature circuit defective

See your John Deere dealer.

CODE 48

Input speed sensor defective

See your John Deere dealer.

CODE 49

Output speed sensor defective

See your John Deere dealer.

CODE 50

Hydrostatic speed sensor defective

See your John Deere dealer.

CODE 51

Output speed sensor defective

See your John Deere dealer.

CODE 52

Hydrostatic speed sensor defective

See your John Deere dealer.

CODE 56

Input speed sensor defective

See your John Deere dealer.

CODE 57

Output speed sensor defective

See your John Deere dealer.

CODE 58

Hydrostatic speed sensor defective

See your John Deere dealer.

CODE 59

Output speed sensor defective

See your John Deere dealer.

CODE 60

Hydrostatic speed sensor defective

See your John Deere dealer.

CODE 64

Input speed sensor defective

See your John Deere dealer.

CODE 65

Output speed sensor defective

See your John Deere dealer.

CODE 66

Hydrostatic speed sensor defective

See your John Deere dealer.

CODE 67

Output speed sensor defective

See your John Deere dealer.

CODE 68

Hydrostatic speed sensor defective

See your John Deere dealer.

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Symptom Problem Solution

CODES 69, 70

Output speed sensor defective

See your John Deere dealer.

CODE 72

Input speed sensor defective

See your John Deere dealer.

CODE 73

Output speed sensor defective

See your John Deere dealer.

CODE 74

Hydrostatic speed sensor defective

See your John Deere dealer.

CODE 75

Output speed sensor defective

See your John Deere dealer.

CODE 76

Hydrostatic speed sensor defective

See your John Deere dealer.

CODES 77, 78

Clutch or speed sensor defective

See your John Deere dealer.

CODE 79

Speed sensor or hydrostatic unit defective

See your John Deere dealer.

CODE 80

Hydraulic oil indicator light circuit defective

See your John Deere dealer.

CODES 81 - 85

Solenoid valve defective

See your John Deere dealer.

CODE 86

Park lock solenoid valve defective

See your John Deere dealer.

CODES 88, 89

Defective solenoid valve at hydrostatic unit

See your John Deere dealer.

CODES 90, 91

Defective clutch solenoid valve

See your John Deere dealer.

CODES 97 - 101

Solenoid valve defective

See your John Deere dealer.

CODE 102

Park lock solenoid valve defective

See your John Deere dealer.

CODES 104, 105

Defective solenoid valve at hydrostatic unit

See your John Deere dealer.

CODES 106, 107

Defective clutch solenoid valve

See your John Deere dealer.

CODES 113 - 117

Solenoid valve defective

See your John Deere dealer.

CODE 118

Park lock solenoid valve defective

See your John Deere dealer.

CODES 120, 121

Defective solenoid valve at hydrostatic unit

See your John Deere dealer.

CODES 122, 123

Defective clutch solenoid valve

See your John Deere dealer.

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Symptom Problem Solution

CODES 128, 129

Fault at operating voltage of TCU

See your John Deere dealer.

CODES 130, 131

Fault at sensor voltage of TCU

See your John Deere dealer.

CODE 132

Fault at operating voltage of TCU

See your John Deere dealer.

CODES 136 - 138

Fault in transmission control unit

See your John Deere dealer.

CODE 139

TCU plugged in at wrong place

See your John Deere dealer.

CODE 146

Output speed sensor defective

See your John Deere dealer.

CODE 147

Park lock solenoid valve defective

See your John Deere dealer.

CODE 149

Park lock cannot be disengaged

See your John Deere dealer.

CODE 151

Output speed sensor defective

See your John Deere dealer.

CODE 152

STOP! Transmission oil temperature too high

Check oil level and filter.

CODE 153

TCU requires recalibration

See your John Deere dealer.

CODE 154

Input speed too high

Reduce speed.

CODE 155

Output speed too high

Reduce speed.

CODE 158

Engine speed too low

Increase speed.

CODE 160

ECU has stopped sending data

See your John Deere dealer.

CODE 161

UIC has stopped sending data

See your John Deere dealer.

CODE 166

PLC has stopped sending data

See your John Deere dealer.

CODE 176

Transmission oil filter blocked

Change filter.

CODE 177

STOP! Transmission oil pressure too low

Check oil level and filter.

CODES 178, 179

Circuit of transm. oil temp. sensor defective

See your John Deere dealer.

CODES 196, 197

TCU receiving false data from ECU

See your John Deere dealer.

CODES 200 - 217

TCU receiving false data from UIC

See your John Deere dealer.

CODES 228 - 237

TCU receiving false data from PLC

See your John Deere dealer.

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