New Holland 19055 – ECU: Urea pressure sensor in block (electric.) - high signal level

The engine control module (ECU) has detected a voltage signal from the urea (AdBlue/DEF) pressure sensor that is above the normal operating range. This indicates an electrical fault, such as a short circuit to a positive voltage source, an open circuit in the sensor's ground or signal return line, or a faulty sensor itself. This condition prevents accurate monitoring of urea pressure, leading to improper AdBlue dosing, increased emissions, and likely an engine derate state.

• T7 Series

1. 1

   Check for other active or stored fault codes related to sensor supply voltage or other SCR components

2. 2

   Visually inspect the wiring harness and connectors between the urea pressure sensor and the engine control module for chafing, corrosion, or loose connections

3. 3

   Verify sensor power supply by disconnecting the sensor and measuring voltage at the power supply pin with the ignition on (typically 5V or 12V)

4. 4

   Check the ground connection by measuring resistance between the ground pin in the sensor connector and a known good chassis ground (should be close to 0 ohms)

5. 5

   Inspect the signal circuit by measuring voltage on the signal wire with the sensor disconnected and ignition on (high voltage indicates a short to power)

6. 6

   Monitor live data for the urea pressure sensor; an abnormally high and static pressure reading with the engine off points to an electrical fault

1. 1

   Address related faults

   Diagnose and repair any other present fault codes first, as they may be the root cause of the pressure sensor fault.

2. 2

   Repair wiring and connectors

   If visual inspection reveals damage to the wiring harness or connectors, repair or replace the affected components and ensure all connections are clean and secure.

3. 3

   Test the sensor

   If wiring is confirmed good, substitute the urea pressure sensor with a known good part to definitively test for internal sensor failure.

4. 4

   Replace urea pressure sensor

   If the sensor is determined to be faulty, replace it. Note that it is typically located on the AdBlue pump module and may require replacing the entire module if integrated.

5. 5

   Clear fault codes

   Use a diagnostic tool to clear all fault codes from the ECU after completing repairs.

6. 6

   Perform system verification

   Start the engine and monitor live urea pressure data to verify readings are within normal range. Run any required system fault repair verification procedure or drive cycle to exit engine derate conditions.