John Deere Error Code F13044 — What It Means and How to Fix It
Applies to: 6R Series, 7R Series, 8R Series, 9R Series
Check the connector at the sensor first — it may just be unplugged. If seated properly, measure resistance across the sensor terminals before buying parts.
Engine Coolant Temperature Sensor — Open Circuit
The ECU cannot detect the coolant temperature sensor signal — the circuit is open. Usually a disconnected plug or broken wire.
Repair difficulty
Experienced DIYRepair time
45 min
Dealer cost
$350-600
What to check first
- 1
Walk to the thermostat housing and check whether the sensor connector is fully seated — vibration can work it loose.
- 2
With the connector unplugged, measure resistance across the sensor terminals with a multimeter — should read 2–3 kΩ at room temperature.
- 3
Flex the wiring harness between the sensor and the cab while the engine runs — a break that comes and goes with movement confirms wire fatigue.
Likely causes
- 1
Disconnected or damaged sensor connector— Most likely
Check the connector at the sensor first. Vibration can work plugs loose over time, especially on high-hour machines.
- 2
Broken wire in harness— Possible
Flex the harness while watching for fault codes. A break that comes and goes with movement is a classic sign of internal wire fatigue.
- 3
Failed coolant temperature sensor (open element)— Possible
The sensor element itself can fail open. Measure resistance across the sensor terminals — should be 2–3 kΩ at room temperature for most JD sensors.
Parts needed
- Search for this part →
Coolant temperature sensor
OEM: RE522824$45
Tools needed
- multimeter
- wiring diagram
- 10mm socket
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