OBD
U0442
Invalid Data Received From ECM/PCM B
What it means
U0442 means Invalid Data Received From ECM/PCM B.
Check these first
- A corroded or damaged ECM/PCM B connector
- Water intrusion or heat damage at the ECM/PCM B
- An open or short in the ECM/PCM B wiring
- Corroded or damaged pins at the ECM/PCM B connector
What to do next
- Scan every module and record the stored codes
- Check ECM/PCM B data on live data
- Inspect the ECM/PCM B connector for corrosion or backed out pins
- Replace the ECM/PCM B if the circuit and grounds test good
- Clear the code and retest
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Updated
Generic SAE J2012 definition. Last updated 2026-10-10.