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DTC Codes / Network

U0001 — High Speed CAN Communication Bus

Networkhigh

A module found a problem on the high-speed CAN data wires.

Symptoms

  • Many warning lights
  • Gauges dead or jumping
  • Scanner can't connect
  • Car may not start

Common causes

  • Broken or shorted CAN wire
  • Water in a connector
  • Faulty module pulling the bus down
  • Missing terminating resistor

How to fix

  1. Battery OFF: measure OBD pin 6 to 14 (≈ 60 Ω)
  2. Key ON: each CAN wire to ground ≈ 2–3 V
  3. Unplug modules one at a time

Can I keep driving?

Not recommended — many systems may stop working.

Related diagrams

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CAN Bus Basics — CAN-H, CAN-L and the 60 Ω Test

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OBD2 Port Pinout — All 16 Pins Explained

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These are the general meanings. Some companies use a code a little differently — confirm with a scanner and your car's service manual.