Lost Communication With Emissions Critical Control Information
What does U0113 mean?
The U0113 code means the vehicle's onboard diagnostic system has detected: Lost Communication With Emissions Critical Control Information. This is a moderate severity code.
Common Symptoms
- Check Engine Light illuminated
- Failed emissions test or readiness monitors incomplete
- Poor fuel economy
- Rough idle or hesitation during acceleration
- Emissions control systems may not function properly
Probable Causes (Ranked by Likelihood)
- Failed ECM or PCM communication circuit Very High
- Damaged CAN bus wiring between emission modules High
- ECM software corruption or update needed Moderate
- Faulty emission control module connector Moderate
- Power supply issue to emission control module Low
Step-by-Step Diagnostic Procedure
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Scan for all DTCs across every module -- note any emission-related codes
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Check CAN bus wiring continuity between the PCM and emission modules
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Verify power supply and ground at the emission control module
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Check for available software updates or TSBs for the ECM/PCM
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Use oscilloscope to verify CAN communication signals
Frequently Asked Questions
Can I drive with code U0113?
You can drive short distances, but the emissions system may not function correctly. This could cause a failed emissions inspection and potentially increased pollutant output. Have it diagnosed soon.
What causes U0113?
The most common causes are a failed ECM communication circuit or damaged CAN bus wiring. Software issues and connector faults are also possible culprits.
Will U0113 cause me to fail emissions?
Yes. This code directly affects emissions control communication, and the vehicle will likely fail an emissions test with this code stored. The readiness monitors may also be incomplete.