U1039moderate severityNetwork
Vehicle Speed Signal Missing or Incorrect
on 1997 Ford Probe 2.5L V6 · FWD
What this code means
A module is not receiving a valid vehicle speed signal over the network. This can affect speed-related functions like the speedometer, cruise control, and transmission shifting.
Symptoms
- Speedometer erratic or dead
- Cruise control won't engage
- Harsh or delayed shifts
Common causes
- Faulty vehicle speed sensor
- Damaged wiring or connector
- Network communication fault
- Failed PCM or ABS module
Diagnostic steps
- Scan all modules for related codes
- Check VSS output with scan tool live data
- Inspect speed sensor wiring and connectors
- Test network bus for signal integrity
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ANCEL AD410 →
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Serious DIY~$100
BlueDriver Pro →
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Autel MaxiCOM MK808S →
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Autel MaxiSys MS906 Pro →
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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