Description:

This error code, ECU 001761.04, is set when the ECU detects that the voltage at the DEF tank fluid level sensor is too low, indicating a short to ground. This can lead to faulty DEF level readings and potentially affect the vehicle’s ability to meet emissions standards.

Reaction:

The ECU may disregard the sensor input due to the unreliable data, which can lead to incorrect management of the DEF system.

Recommendations:

• Inspect Sensor and Circuit: Check the DEF tank fluid level sensor and its circuit for any signs of damage or potential shorts to ground.
• Measure Sensor Voltage: Use a multimeter to measure the voltage at the sensor. Low voltage readings can confirm a short to ground.
• Identify and Repair Short Circuits: Locate and repair any shorts within the circuit, ensuring that all connections are secure.
• Replace Faulty Sensor if Necessary: If the sensor is damaged or continues to show faulty readings after wiring repairs, replace it.
• Reset ECU and Verify Sensor Operation: Reset the ECU to clear the error and perform tests to verify that the sensor now provides accurate readings.

Note:

Maintaining accurate DEF level readings is essential for the proper function of emissions control systems. Ensure all electrical connections and components in the DEF system are regularly inspected and maintained.