Lost Communication With Hybrid/EV Battery Interface Control Module E

Where it lives

For U01A4, start at the module the description names.

Check these first

• A software or calibration error in interface module E
• A failed hybrid battery interface control module E
• Corroded pins at the interface module E connector
• Interface module E losing power or ground
• Interface module E dropping off the CAN bus

What to do next

1. Check power and ground at interface module E first
2. Inspect the interface module E connector pins for corrosion
3. Confirm interface module E answers on the CAN bus
4. Reprogram the hybrid control module if calibration is the cause
5. Replace hybrid battery interface control module E if it stays offline
6. Clear the code and retest

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