U0431moderate severityNetwork
Invalid Data Received From Body Control Module A
on 2017 Toyota Highlander 2.7L I4 · FWD
What this code means
The network is receiving invalid or implausible data from Body Control Module A. Since the BCM manages many body electronics, this can cause a range of odd electrical faults.
Symptoms
- Multiple electrical features malfunction
- Warning lights on dash
- Lights, locks, or windows act erratically
Common causes
- Faulty body control module
- Wiring or connector corrosion at BCM
- Low battery voltage or bad ground
- CAN bus communication fault
Diagnostic steps
- Scan all modules for related codes
- Check battery voltage and BCM grounds
- Inspect BCM wiring and connectors
- Test CAN bus signals to the BCM
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Other Network codes on this vehicle
U0001
High Speed CAN Communication Bus
U0002
High Speed CAN Communication Bus Performance
U0003
High Speed CAN Communication Bus (+) Open
U0004
High Speed CAN Communication Bus (+) Low
U0005
High Speed CAN Communication Bus (+) High
U0006
High Speed CAN Communication Bus (-) Open
U0007
High Speed CAN Communication Bus (-) Low
U0008
High Speed CAN Communication Bus (-) High
U0009
High Speed CAN Communication Bus Shorted Together
U0010
Medium Speed CAN Communication Bus