U1131moderate severityNetwork
Fuel System Data Fault
on 2004 Ford Thunderbird 3.8L V6 · FWD
What this code means
A module received invalid or missing fuel system data over the network. This can cause running issues or incorrect fuel gauge and system readings.
Symptoms
- Fuel gauge inaccurate
- Poor engine performance
- Warning lamp illuminated
Common causes
- Faulty fuel sender or sensor
- Network communication error
- Damaged wiring or connector
- Failed PCM or fuel module
Diagnostic steps
- Scan all modules for fuel-related codes
- Check fuel data values in live data
- Inspect fuel sensor wiring and connectors
- Verify network bus communication
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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