U0113
NetworkEmission Controlmoderate severityLost Communication With Emissions Control Unit A
What U0113 Means
A module can no longer talk to the emissions control unit on the data network. Often caused by wiring problems or a failed emissions module.
Symptoms
- Check engine light on
- Emissions-related codes set
- Possible reduced performance
Common Causes
- Faulty bus wiring or connectors
- Poor ground connection
- Failed emissions control unit
- Fuse or power supply fault
Diagnostic Steps
- Scan for communication codes in all modules
- Verify power and ground to emissions unit
- Inspect CAN wiring and connectors
- Measure bus voltages for faults
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ANCEL AD410 →
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Serious DIY~$100
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Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
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