U0037low severityNetwork
LIN Bus A Communication Performance
on 2021 Ford Mustang Mach-E Extended Range Dual Motor AWD · AWD
What this code means
Communication on LIN bus A is degraded. LIN buses connect lower-priority subsystems like seat modules, rain sensors, and mirror controls.
Symptoms
- Seat adjustment issues
- Rain sensor not responding
- Auto-dimming mirror malfunction
- Intermittent accessory faults
Common causes
- LIN bus wiring issue
- LIN master module fault
- LIN slave device failure
- Wiring resistance too high
Diagnostic steps
- Check LIN bus voltage (typically 0-12V)
- Test LIN master module
- Inspect LIN wiring for high resistance
- Check LIN slave device responses
Repair notes
LIN bus operates at lower speeds. Check wiring resistance and master module.
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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