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Definition only
Lights the check engine lamp
U01A5: Lost Communication With Hybrid/EV Battery Interface Control Module F
Standardized SAE J2012 code · U01xx — Lost communication with modules
What does U01A5 mean?
ECU lost CAN communication with hybrid/EV HV battery interface module F (BMS slave or cell-monitoring submodule).
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Common causes
- High Module unpowered
- Low Gateway module routing CAN messages incorrectly
- Low CAN terminating resistor (120 Ω) drifted out of spec
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of U01A5 on the same make and model first.
U01A5 in the community
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Describe your U01A5 problemRelated codes
- U01A0 Lost Communication With Hybrid/EV Battery Interface Control Module A
- U01A1 Lost Communication With Hybrid/EV Battery Interface Control Module B
- U01A2 Lost Communication With Hybrid/EV Battery Interface Control Module C
- U01A3 Lost Communication With Hybrid/EV Battery Interface Control Module D
- U01A4 Lost Communication With Hybrid/EV Battery Interface Control Module E
- U01A6 Lost Communication With Hybrid/EV Battery Interface Control Module G
- U01A7 Lost Communication With Hybrid/EV Battery Interface Control Module H
- U01A8 Lost Communication With Hybrid/EV Battery Interface Control Module I
- U01A9 Lost Communication With Hybrid/EV Battery Interface Control Module J
- U01AA Lost Communication With Hybrid/EV Battery Interface Control Module K
- U01AB Lost Communication With Hybrid/EV Battery Interface Control Module L
- U01AC Lost Communication With Hybrid/EV Battery Interface Control Module M