John Deere fault codes & repair guides
All 3,995 codes· 50 per page · page 2 of 80
| Code | Controller | Issue summary | Repair manual |
|---|---|---|---|
| 12 | — | Main gearcase filter issue detected when engine is not running | Full repair manual for code 12 |
| 13 | — | Precleaner Actuators Not Calibrated | Full repair manual for code 13 |
| 13 | — | Folding Unloading Auger Position Sensor Not Calibrated | Full repair manual for code 13 |
| 13 | — | Deck Plates Detected Without Calibration | Full repair manual for code 13 |
| 16 | — | Precleaner 1 and Precleaner 2 Actuators Not Synchronized | Full repair manual for code 16 |
| 16 | — | Folding Auger Position Calibration Voltage Out of Range High | Full repair manual for code 16 |
| 16 | — | Deck Plates Sensor Voltage Too High | Full repair manual for code 16 |
| 18 | — | Coolant Temperature Input Voltage too High | Full repair manual for code 18 |
| 18 | — | Deck Plates Sensor Voltage Too Low | Full repair manual for code 18 |
| 19 | — | Coolant Temperature Input Voltage too Low | Full repair manual for code 19 |
| 21 | — | Sensor Supply Voltage too High | Full repair manual for code 21 |
| 22 | — | Sensor Supply Voltage too Low | Full repair manual for code 22 |
| 25 | — | Manifold Air Temperature Input Resistance too High | Full repair manual for code 25 |
| 26 | — | Manifold Air Temperature Input Resistance too Low | Full repair manual for code 26 |
| 27 | — | EGR Valve Position Signal Fault | Full repair manual for code 27 |
| ECU000027.03 | ECU | EGR Sensor Circuit Fault | Full repair manual for code ECU000027.03, ECU |
| 27.03 | Engine Control Unit (ECU) | Engine EGR Valve Position Signal Out of Range High | Full repair manual for code 27.03, Engine Control Unit (ECU) |
| ECU000027.04 | ECU | EGR Sensor Circuit Fault | Full repair manual for code ECU000027.04, ECU |
| 27.04 | Engine Control Unit (ECU) | Engine EGR Valve Position Signal Too Low (ECU) / EGR Valve Position Signal Out of Range Low | Full repair manual for code 27.04, Engine Control Unit (ECU) |
| 27.07 | Engine Control Unit (ECU) | Engine EGR Valve Position Does Match The ECU Requested Position | Full repair manual for code 27.07, Engine Control Unit (ECU) |
| 28 | — | Digital Throttle Signal Fault | Full repair manual for code 28 |
| 28.............. | — | Throttle #3 Signal Out of Range High | Full repair manual for code 28.............. |
| 28.............. | — | Check Sensor and Wiring | Full repair manual for code 28.............. |
| 29 | — | Secondary Analog Throttle Signal Fault | Full repair manual for code 29 |
| 29.............. | — | Throttle #2 Signal Out of Range High | Full repair manual for code 29.............. |
| 29.............. | — | Check Sensor and Wiring | Full repair manual for code 29.............. |
| 000029.03 | — | Hand Throttle Signal Voltage Issue (ECU) | Full repair manual for code 000029.03 |
| 29.03 | Engine Control Unit (ECU) | Secondary Analog Throttle Signal Out of Range High | Full repair manual for code 29.03, Engine Control Unit (ECU) |
| 000029.04 | — | Hand Throttle Signal Voltage Issue (ECU) | Full repair manual for code 000029.04 |
| 29.04 | ECU | Secondary Throttle Signal Out of Range Low | Full repair manual for code 29.04, ECU |
| 29.14 | ECU | Hand Throttle Signal Voltage Issue Out Of Range | Full repair manual for code 29.14, ECU |
| 35 | — | Rack Position Voltage too High | Full repair manual for code 35 |
| 36 | — | Rack Position Voltage too Low | Full repair manual for code 36 |
| 37 | — | Fuel Temperature Input Voltage too High | Full repair manual for code 37 |
| 38 | — | Fuel Temperature Input Voltage too Low | Full repair manual for code 38 |
| 46 | — | Start Signal Always Active | Full repair manual for code 46 |
| 51 | — | Air Throttle Actuator Position Signal Fault | Full repair manual for code 51 |
| 000051.03 | — | Engine Air Throttle Valve Position Sensor Value Too High | Full repair manual for code 000051.03 |
| 51.03 | Engine Control Unit (ECU) | Air Throttle Actuator Position Signal Out of Range High | Full repair manual for code 51.03, Engine Control Unit (ECU) |
| ECU000051.04 | ECU | Air Throttle Valve Position Sensor Circuit Fault | Full repair manual for code ECU000051.04, ECU |
| 51.04 | Engine Control Unit (ECU) | Engine Air Throttle Valve Position Sensor value Too Low / Air Throttle Actuator Position Signal Out of Range Low | Full repair manual for code 51.04, Engine Control Unit (ECU) |
| 51.07 | Engine Control Unit (ECU) | Engine Air Throttle Position Does Match The ECU Requested Position | Full repair manual for code 51.07, Engine Control Unit (ECU) |
| 53 | — | Rack Instability Detected | Full repair manual for code 53 |
| 54 | — | Power Problem To ECU | Full repair manual for code 54 |
| 54 | — | Throttle Signal Fault | Full repair manual for code 54 |
| 61 | — | Coolant Level Low | Full repair manual for code 61 |
| 62 | — | Coolant Temperature Warning Threshold | Full repair manual for code 62 |
| 63 | — | Coolant Temperature Above Shutdown Threshold | Full repair manual for code 63 |
| 66 | — | Coolant Temperature Above Warning Threshold | Full repair manual for code 66 |
| 73 | — | Fuel Flow/Throttle Output Signal Stuck High | Full repair manual for code 73 |
