🚜 John Deere ECU 551763 – Coolant Temperature Sensor Input Repair

his is a professional repair service for the John Deere ECU (Part No. 551763) commonly affected by coolant temperature sensor input faults. A failure in this circuit can result in erratic temperature readings, warning messages, or engine derating.

We’ve developed a proven, repeatable repair procedure specifically for this fault. The repair is carried out at the component level, targeting the input section circuitry responsible for reading the coolant temperature signal.

Common Symptoms:

• Fault codes relating to coolant temperature

• Engine running in limp or derate mode

• No or incorrect temperature display

What We Do:

• Confirm and isolate the fault

• Repair/replace affected input circuit components

• Bench test the ECU to confirm full function