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Nissan U1025-00 90%

Since this code involves the communication network, the symptoms can be widespread and sometimes frightening. You might experience:

If you’ve verified voltage, cleaned grounds, and disconnected accessories, one module may be “taking down the bus.” This usually requires a professional scan tool to isolate which module is corrupt. nissan u1025-00

While less common than wiring issues, a specific module (like the ABS actuator or the TCM) can internally fail. When the internal processor crashes, it stops communicating, flagging this code. Since this code involves the communication network, the

With the ignition OFF, disconnect the battery negative terminal. Measure resistance between CAN High and CAN Low at the ABS module connector (using the correct pins from the service manual). You should see 60 ohms (two 120-ohm terminating resistors in parallel). With ignition ON, measure CAN High to ground: ~2

With ignition ON, measure CAN High to ground: ~2.6V; CAN Low to ground: ~2.4V. Significant deviation indicates a short to power or ground.

  • CAN Bus:
  • Signal integrity:

    • This is the most common and overlooked cause. Modern automotive computers require a steady voltage supply (usually above 12.6V) to communicate properly. If your battery is weak or the alternator is failing, the voltage might drop low enough for the CAN bus to become unstable, causing modules to send garbage data.

    | Severity | Medium to High | |----------|----------------| | Drivability impact | Yes – limp mode | | Risk of damage | Low if driven briefly; prolonged driving may overheat transmission due to improper line pressure | | Estimated repair cost | $300–$800 (TCM replacement + reprogramming); $150–$300 if wiring repair |