U0015moderate severityNetwork
Control Module Communication Bus A Open
on 2017 Toyota Highlander 2.7L I4 · FWD
What this code means
An open circuit in communication bus A breaks the data link between modules. Affected modules cannot send or receive information.
Symptoms
- Lost communication
- Warning lights on
- Inoperative systems
Common causes
- Broken bus A wire
- Loose or disconnected connector
- Faulty control module
- Corroded terminals
Diagnostic steps
- Scan all modules
- Check bus A wiring continuity
- Inspect connectors for damage
- Verify module power and ground
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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