Case IH 19052 – Engine Control Unit (ECU): Upstream NOx sensor internal failure (Heater Short Circuit Error)

The upstream NOx sensor relies on an internal heating element to quickly reach operating temperature. Fault code 19052 indicates that the system has detected a short circuit specifically within this internal heater circuit, preventing the sensor from reaching the correct temperature and rendering its emissions data unreliable.

• Tier 4b
• 240 Series Axial-Flow (7240, 8240, 9240)
• 5130
• 6130
• 7130
• 7230
• 8230
• 9230
• 5140
• 6140
• 7140
• Magnum 180
• Magnum 190
• Magnum 200
• Magnum 210
• Magnum 220
• Magnum 225
• Magnum 235
• Magnum 240
• Magnum 250
• Magnum 260
• Magnum 280
• Magnum 290
• Magnum 310
• Magnum 315
• Magnum 340
• Magnum 370
• Magnum 380
• Puma 150
• Puma 165
• Puma 185
• Puma 200
• Puma 220
• Steiger / Quadtrac 350
• Steiger / Quadtrac 370
• Steiger / Quadtrac 400
• Steiger / Quadtrac 420
• Steiger / Quadtrac 450
• Steiger / Quadtrac 470
• Steiger / Quadtrac 500
• Steiger / Quadtrac 540
• Steiger / Quadtrac 550
• Steiger / Quadtrac 580
• Steiger / Quadtrac 600
• Steiger / Quadtrac 620
• Maxxum 115
• Maxxum 125
• Maxxum 135
• Maxxum 145
• Maxxum 150
• Farmall 100A
• Farmall 110A
• Farmall 120A
• Farmall 130A
• Farmall 140A
• Farmall 150A
• Farmall 170A
• Patriot 2250
• Patriot 3240
• Patriot 3340
• Patriot 4440
• Titan 3030
• Titan 3040
• Titan 3530
• Titan 3540
• Titan 4030
• Titan 4040
• Titan 4530
• Titan 4540

1. 1

   Visual Inspection: Locate the upstream NOx sensor (before the DOC) and trace its wiring back to the 5-cavity female wire connector. Look for melted wires, chafing against the exhaust, or water intrusion in the connector.

2. 2

   Circuit Testing: Disconnect the sensor and check the machine-side harness for a short to ground or a short to power on the heater circuit pins.

3. 3

   Check for Accompanying Codes: Look for other CAN timeout codes (e.g., 19060) or open circuit codes (e.g., 19054). If multiple sensor codes are present, the issue is likely a damaged harness. If 19052 is isolated and the harness tests fine, the sensor's internal heater has failed.

1. 1

   Safety First

   Turn off the engine, disconnect the battery, and allow the exhaust system to cool completely to avoid severe burns.

2. 2

   Locate the Sensor

   Find the upstream NOx sensor mounted in the exhaust pipe just before the Diesel Oxidation Catalyst (DOC).

3. 3

   Disconnect Wiring

   Unplug the 5-pin electrical connector linking the sensor to the engine harness.

4. 4

   Remove the Sensor

   Using a specialized NOx/O2 sensor socket or a wrench, carefully unscrew the sensor from the exhaust pipe. (If seized, apply penetrating oil and allow it to soak).

5. 5

   Prepare the New Sensor

   Ensure the threads of the new sensor have anti-seize compound applied. Caution: Do not get any anti-seize on the sensor probe tip, as this will contaminate it.

6. 6

   Install the New Sensor

   Thread the new sensor into the exhaust pipe and tighten it to the manufacturer's torque specification.

7. 7

   Reconnect

   Plug the 5-pin connector back into the machine's harness and reconnect the battery.

8. 8

   Clear Codes

   Connect the Case IH Electronic Service Tool (EST) to the diagnostic port to clear the 19052 fault code from the ECU. Run the engine to operating temperature to ensure the code does not return.