U1025-00 — Nissan

In Nissan vehicles, specifically those equipped with the YD25 diesel engine (found in the Navara D40, Pathfinder R51, and NP300), the fault code U1025-00 indicates a Turbocharger Boost Communication Line failure.

When code U1025-00 appears, it means one of these modules sent a message that another module didn't understand, or the message never arrived at all. The ECM is essentially saying, "I received a signal from another computer, but the data looks corrupt, incomplete, or totally wrong." nissan u1025-00

Check Engine Light (MIL): The dashboard will display a warning light. In Nissan vehicles, specifically those equipped with the

• With ignition ON (engine off), measure key power to TCM pin(s) per schematic. Expect battery voltage at Vcc pin.
• Check ground continuity TCM-to-chassis (<1Ω ideally).

Preventing Recurrence of U1025-00

After repair, take these steps to avoid future CAN faults: With ignition ON (engine off), measure key power

Actuator Replacement: If the wiring is intact and the vanes move freely, the electronic actuator unit itself likely requires replacement or professional refurbishment.

The Resolution