New Holland 14051 – ADIC or DIC: Fuel Tank Level Sender Open Circuit or Short to High Voltage

The instrument cluster has detected an open circuit or a short to high voltage in the fuel tank level sender circuit. An open circuit indicates a break in the wiring or an internal failure within the sender itself, while a short to high voltage means the signal wire has come into contact with a higher voltage source (such as 12V power). This fault prevents accurate fuel level measurement, resulting in an inoperative or incorrect fuel gauge reading, and could affect overall system operation.

• T5 Series
• T5.95
• T5.105
• T5.115
• T6000 Series
• T7000 Series
• Workmaster Series
• Workmaster 50
• MXM Series
• TM Series
• TG Series
• TG230

1. 1

   Visually inspect the wiring harness leading from the cab to the fuel tank for chafing, cuts, or melted insulation.

2. 2

   Inspect the fuel level sender electrical connector on top of the fuel tank for corrosion, dirt, or loose pins.

3. 3

   Disconnect the sender connector and test for power at the supply pin with the ignition ON (look for voltage, potentially an 8-volt reference from the instrument controller). If there is no voltage, the issue is likely in the wiring or the instrument cluster itself.

4. 4

   Test the ground connection on the harness side for continuity to a known good chassis ground (resistance should be less than 1 ohm).

5. 5

   Measure the fuel level sender's resistance across its signal and ground terminals. You can test the sender's functionality by removing it from the tank and manually moving the float arm. Resistance should change smoothly (approx. 73 ohms empty to 10 ohms full). Infinite resistance indicates an internal open circuit; zero ohms indicates a short.

1. 1

   Isolate the fault

   Based on the multimeter diagnostic checks, determine if the issue is located in the wiring harness or the fuel level sender unit itself.

2. 2

   Repair wiring harness

   If a break or short is found in the wiring, repair the damaged section using automotive-grade connectors and heat shrink tubing to ensure a durable and weather-resistant repair.

3. 3

   Replace fuel level sender

   If the sender fails the resistance test, drain or lower the fuel level. Clean the mounting flange area, disconnect wiring, remove retaining hardware, and extract the old sender noting the float arm orientation. Install the new sender with a new gasket, ensuring the float arm moves freely without hitting the tank sides. Secure the sender with its mounting hardware and reconnect the electrical connector.

4. 4

   Verify repair

   Reconnect the battery, turn the ignition to the ON position, and verify the fuel gauge provides a plausible reading. Clear the 14051 fault code with a diagnostic tool and add fuel to confirm the gauge updates correctly.