Step 1: Clear the code. Drive the car for 10 minutes. Does it come back? If no, it was a voltage glitch.
Step 2: If it returns, perform a “hard reset.” Disconnect the negative battery terminal. Press the brake pedal for 30 seconds (this drains residual power). Reconnect. Drive again. nissan u1025-00
Step 3: If the code persists, inspect the battery terminals and ground cables. A $10 multimeter should show 12.4V+ engine off, 14.2V+ engine running. Step 1: Clear the code
Step 4: If everything looks clean, you likely need a professional scan tool (like a high-end Autel or Snap-on) to perform a “CAN bus integrity test.” If no, it was a voltage glitch
The CAN Bus wires are typically twisted pairs running under the vehicle or near the firewall. Exposure to road salt, water intrusion, or rodents chewing on wires can sever the connection between modules.
Rare, but a failing ECM or a shorted module (e.g., BCM, TCM) on the same CAN bus can corrupt the entire network, triggering multiple U-codes (U1000, U1010, U1025).