ECU 001136.02 – Engine Control Unit, Temperature Invalid. John Deere System Advisory.

ECU 001136.02 (ECU 1136.02)

Code: 001136.02

Shortcode: 1136.02


This error code, ECU 001136.02, is set when the ECU detects that its internal temperature sensor signal is invalid. An invalid temperature signal can result from sensor malfunctions, wiring issues, or internal ECU faults.


The ECU may limit engine performance or initiate protective measures to prevent potential damage due to inaccurate temperature readings.


  • Inspect Temperature Sensor: Check the internal temperature sensor for signs of damage or malfunction. Ensure it is securely connected and functioning correctly.
  • Verify Wiring and Connections: Examine the wiring and connectors related to the temperature sensor for any signs of damage, corrosion, or loose connections that could affect signal integrity.
  • Test Sensor Signal: Use diagnostic tools to test the signal from the temperature sensor and verify its accuracy. Compare the readings to the expected values.
  • Replace Faulty Sensor: If the temperature sensor is found to be defective, replace it with a new one to restore accurate temperature monitoring.
  • Check for ECU Faults: If the sensor and wiring are in good condition, the issue may be internal to the ECU. Consider consulting with a specialist for potential ECU repairs or replacement.
  • Reset ECU and Verify Operation: After addressing the issue, reset the ECU to clear the error code and perform tests to ensure the temperature sensor operates correctly and no further errors are detected.


Accurate temperature monitoring is essential for ECU protection and reliable engine performance. Regular inspection and timely maintenance of the temperature sensor and related components can help prevent invalid signal issues.

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