DTC U0013 – Medium Speed CAN Communication Bus High

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DTC U0013 – Medium Speed CAN Communication Bus High

What Does DTC U0013 Mean?

DTC U0013 indicates that the vehicle has detected an abnormal voltage condition on the Medium-Speed Controller Area Network (MS-CAN) High communication circuit. This usually points to a wiring fault, connector issue, or a control module affecting network communication. The exact definition may vary by manufacturer.

Severity

High. A CAN bus fault can interrupt communication between multiple control modules and may disable several electronic systems.

Can You Drive with U0013?

Yes, the vehicle is usually drivable, but some electronic functions may not operate correctly. The problem should be diagnosed and repaired as soon as possible.

Symptoms

  • Check Engine or communication warning light.
  • Multiple U-codes stored.
  • Loss of communication with one or more modules.
  • Instrument cluster warning messages.
  • Electrical accessories working intermittently.

Common Causes

  • CAN High wire shorted to battery voltage.
  • Open or damaged CAN wiring.
  • Loose or corroded connectors.
  • Faulty control module loading the CAN network.
  • Poor battery voltage or charging system problems.

How to Diagnose U0013

  1. Scan all control modules and record every communication DTC.
  2. Check battery voltage and charging system output.
  3. Inspect CAN High and CAN Low wiring for damage.
  4. Inspect connectors for corrosion or loose terminals.
  5. Measure CAN bus voltage and resistance according to the factory service manual.
  6. Disconnect suspected modules one at a time if necessary.
  7. Repair the fault, clear all codes, and verify proper communication.

Typical CAN Network Layout

         PCM
          │
          ▼
      CAN Bus
          │
          ▼
         BCM
          │
          ▼
         ABS
          │
          ▼
         TCM
          │
          ▼
 Instrument Cluster

Estimated Repair Cost

  • Battery or charging repair: $50–250
  • CAN wiring repair: $80–300
  • Connector replacement: $30–150
  • Control module replacement: $300–1,000

Related DTCs

  • U0010
  • U0011
  • U0012
  • U0014

Frequently Asked Questions

Can a short to voltage cause U0013?

Yes. A short to battery voltage on the CAN High circuit is one of the most common causes of this code.

Can one bad control module trigger U0013?

Yes. A failed control module can disrupt the CAN network and generate U0013 along with other communication codes.

Is U0013 the same on every vehicle?

No. The exact code definition and diagnostic procedures vary by manufacturer. Always refer to the factory service information for your specific vehicle.

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