U0158low severityNetwork
Lost Communication with Head-Up Display Module
on 2004 Cadillac STS 4.6L V8 · RWD
What this code means
Cannot communicate with the head-up display (HUD) projector module.
Symptoms
- HUD not projecting
- HUD display blank
- HUD settings not accessible
- HUD warning message
Common causes
- HUD module failure
- CAN bus wiring
- Module power loss
- Fuse blown
- HUD projector lamp failure
Diagnostic steps
- Check HUD module fuse
- Test power and ground
- Check CAN wiring
- Inspect HUD projector unit
- Test with diagnostic tool
Repair notes
Check fuses. HUD projector units can fail from heat exposure on dash.
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