Question 1

What does John Deere fault code 102.02 mean?

Accepted Answer

102.02 (ECU): Low power; Black smoke; Turbo "fluttering" sound. Fix: Intake Manifold Pressure Data Erratic.

LOGIC: The MAP (Boost) sensor reading does not match the Barometric pressure or RPM mapping.

ACTION: 1. Inspect for cracked intercooler hoses. 
2. Check the sensor for oil/soot clogging. 
3. Verify turbo wastegate movement.

FIX: Replace Boost Pressure Sensor or repair leaking intake plumbing.

Question 2

What does John Deere fault code 110.00 / .16 mean?

Accepted Answer

110.00 / .16 (ECU): Overheat alarm; Engine power cut; Fan at max speed. Fix: Engine Coolant Temp High (Severe/Moderate).

LOGIC: Coolant temperature has exceeded the safety map in the ECU.

ACTION: 1. Clean the radiator/oil cooler "sandwich." 
2. Check coolant level. 
3. Check for a slipping fan belt.

FIX: Clean coolers; replace Thermostat; or replace Water Pump.

Question 3

What does John Deere fault code 1569.31 mean?

Accepted Answer

1569.31 (ECU): Significant power loss; Engine won't rev up; Turtle icon on dash. Fix: Engine Fuel Derate.

LOGIC: This is a "Condition" code, not a sensor fault. The ECU is protecting the engine because of another active fault (usually heat or emissions).

ACTION: 1. Check for other active ECU codes. 
2. Verify coolant and oil temperatures. 
3. Check for fuel restriction.

FIX: Address the primary fault code that triggered the derate.

Question 4

What does John Deere fault code 3216.2 mean?

Accepted Answer

3216.2 (ECU): Yellow CEL; Potential derate; DPF regens becoming frequent. Fix: Inlet NOx Sensor Drifted High.

LOGIC: The sensor signal is "out of bounds" for the current engine load/exhaust flow.

ACTION: 1. Check exhaust for leaks upstream of the sensor. 
2. Verify DEF dosing is occurring.

FIX: Replace the Inlet NOx Sensor.

Question 5

What does John Deere fault code 3719.16 mean?

Accepted Answer

3719.16 (ECU): DPF light on; Request for "Parked Regen." Fix: DPF Soot Load - High.

LOGIC: The pressure differential across the DPF shows it is nearly plugged with soot.

ACTION: 1. Perform a Parked Manual Regen. 
2. If it fails, check the "Doser" (7th injector) for clogging.

FIX: Perform Manual Regen; clean/replace DPF filter if it won't burn off.

Question 6

What does John Deere fault code 5246 mean?

Accepted Answer

5246 (ECU): 5 MPH LOCKOUT; Red Stop Lamp; Machine is effectively disabled. Fix: SCR Operator Inducement - Severity 3.

LOGIC: Final stage of emissions enforcement. An SCR fault has been ignored for too long.

ACTION: 1. Identify the root cause (NOx, DEF quality, or Level). 
2. Repair the hardware fault.

FIX: Repair primary SCR fault; perform "Service Recovery Regen" or "Inducement Reset" via Service Advisor software.

Question 7

What does John Deere fault code 639.13 mean?

Accepted Answer

639.13 (ECU): Dash display goes "blank" or shows "No Comm"; Machine may stay at idle. Fix: CAN Bus J1939 Data Link Error.

LOGIC: The ECU and ICU (Monitor) have lost communication with each other.

ACTION: 1. Check for 60 ohms between CAN High and CAN Low. 
2. Inspect the "Terminating Resistor." 
3. Check the harness at the cab-to-frame bulkhead.

FIX: Repair broken CAN bus wires; replace failed Terminating Resistor.

Question 8

What does John Deere fault code 97.03 / .04 mean?

Accepted Answer

97.03 / .04 (ECU): Alarm buzzer; Warning light; Possible engine shutdown. Fix: Water in Fuel Sensor High/Low.

LOGIC: The sensor in the primary fuel bowl detects conductivity (water) at the bottom of the filter.

ACTION: 1. Drain the fuel/water separator. 
2. Check the sensor plug for corrosion (false readings).

FIX: Drain water from fuel system; replace fuel filters; or replace the Water-In-Fuel sensor.

Question 9

What does John Deere fault code ECU 000097.03 mean?

Accepted Answer

ECU 000097.03: Water in Fuel. Fix: LOGIC: Water-in-fuel sensor detects high conductivity in the bowl.

ACTION: Drain the primary fuel filter separator immediately; check for tank contamination.

John Deere Fault Codes

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Code	System	Symptom	Full fix
102.02	ECU	Low power; Black smoke; Turbo "fluttering" sound.	View fix
110.00 / .16	ECU	Overheat alarm; Engine power cut; Fan at max speed.	View fix
1569.31	ECU	Significant power loss; Engine won't rev up; Turtle icon on dash.	View fix
3216.2	ECU	Yellow CEL; Potential derate; DPF regens becoming frequent.	View fix
3719.16	ECU	DPF light on; Request for "Parked Regen."	View fix
5246	ECU	5 MPH LOCKOUT; Red Stop Lamp; Machine is effectively disabled.	View fix
639.13	ECU	Dash display goes "blank" or shows "No Comm"; Machine may stay at idle.	View fix
97.03 / .04	ECU	Alarm buzzer; Warning light; Possible engine shutdown.	View fix
ECU 000097.03	—	Water in Fuel.	View fix