Nissan U1025-00 [ SECURE ✮ ]

: Incorrect voltage levels on the CAN High or CAN Low lines (should typically be around 2.5V each). Recommended Steps Inspect the Plug

Inspect all accessible wiring and connectors on the communication bus for:

The Diagnostic Trouble Code (DTC) indicates a communication breakdown between the Engine Control Unit (ECU) and the Electronic Turbo Actuator module , which commonly causes an immediate drop in engine power (limp mode) in diesel models like the Nissan Navara, Pathfinder, and NP300. The suffix "-00" represents a sub-type code signifying that there is no further specific sub-fault information available from the sensor, pointing to a blanket communication failure.

Insufficient power can cause modules to fail to communicate properly. nissan u1025-00

Look for green, white, or brown oxidation on the metal pins.

| Model | Common Context | | :--- | :--- | | | Most commonly reported, especially the 2.5L turbo diesel variant; often appears as "turbocharger boost communication line" | | Pathfinder R51 | Diesel models; code often appears alongside P102B during cold starts with severe power loss | | Murano | General communication errors | | Qashqai / Rogue | Especially diesel versions with turbocharging systems | | Juke, Note, Micra | Various models have reported the code |

If you are DIY-ing this, start by inspecting the directly on the turbocharger for signs of green corrosion or "pushed-back" pins. : Incorrect voltage levels on the CAN High

However, if you ignore it and the underlying issue is a failing BCM or TCM, you could eventually get stuck in “limp mode” (reduced power, no shifting above 2nd gear).

Check all vacuum lines from the pump, through the solenoid, to the actuator for cracks, splits, or blockages. 4. Clean or Replace the MAP Sensor

Engine RPM might be restricted, refusing to go over a certain limit (often 2000-2500 RPM). Insufficient power can cause modules to fail to

If a broken wire is found, it must be repaired or the wiring harness replaced.

An incorrect air-to-fuel ratio caused by failing boost management can produce unburnt diesel smoke. 🔍 Root Causes of the Communication Failure

She grabbed her oscilloscope and back-probed the high-speed CAN bus wires twisted together behind the dashboard. The波形 looked fine at first—clean 2.5-volt square waves. But as she watched, a tiny, nasty spike of noise appeared every 73 milliseconds.

If your Nissan is a 2013-2018 Rogue or Altima with this code and a dead battery, replace the battery first. I’ve seen this code clear itself after three complete drive cycles following a new battery install.

The high-speed CAN bus uses a twisted pair of wires (usually light green and light blue). A chaffed wire shorting to ground or battery voltage will kill all communication.