DTC U0015 – Medium Speed CAN Communication Bus Open

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DTC U0015 – Medium Speed CAN Communication Bus Open

What Does DTC U0015 Mean?

DTC U0015 indicates that the vehicle has detected an open circuit on the Medium-Speed Controller Area Network (MS-CAN). An open circuit prevents control modules from exchanging data correctly and may cause communication failures across multiple vehicle systems. The exact description can vary by manufacturer.

Severity

High. An open CAN bus circuit may disable communication between several control modules and affect important vehicle functions.

Can You Drive with U0015?

The vehicle may still be drivable, but several electronic systems may stop functioning correctly. The problem should be diagnosed and repaired as soon as possible.

Symptoms

  • Check Engine or communication warning light illuminated.
  • Multiple U-codes stored.
  • Loss of communication with one or more control modules.
  • Warning messages on the instrument cluster.
  • Electrical features may operate intermittently or stop working.

Common Causes

  • Open circuit in the CAN High or CAN Low wiring.
  • Broken or damaged wiring harness.
  • Loose or disconnected connectors.
  • Corroded CAN bus terminals.
  • Faulty control module interrupting communication.

How to Diagnose U0015

  1. Scan all control modules and record all communication DTCs.
  2. Check battery voltage and charging system.
  3. Inspect the CAN wiring harness for damage or disconnected wires.
  4. Inspect all CAN connectors for corrosion or loose terminals.
  5. Measure CAN bus resistance and voltage according to the factory service manual.
  6. Disconnect suspected modules one at a time if communication cannot be restored.
  7. Repair the fault, clear the codes, and verify network operation.

Typical CAN Network Layout

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

Estimated Repair Cost

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

Related DTCs

  • U0012
  • U0013
  • U0014
  • U0016

Frequently Asked Questions

Can a broken wire cause U0015?

Yes. A broken CAN High or CAN Low wire is one of the most common causes of this code.

Can a loose connector trigger U0015?

Yes. A loose or corroded connector can interrupt communication and store U0015.

Is U0015 the same on every vehicle?

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

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