High Speed CAN Communication Bus
2007-2012 Nissan Altima 2.5L I4
Description
General malfunction on the high-speed CAN bus network.
Symptoms
- Multiple warning lights
- Communication errors
- Some systems inoperative
- Scan tool communication issues
Common Causes
- CAN bus wiring damage
- Shorted CAN H or CAN L wire
- Missing termination resistor
- Module failure pulling down bus
- Aftermarket device interference
Diagnostic Steps
- Check for aftermarket devices on OBD port
- Measure CAN bus resistance (should be ~60 ohms)
- Scope CAN H and CAN L signals
- Check for damaged wiring
- Isolate modules one at a time
Repair Notes
CAN bus issues can be complex. Check wiring first. Remove aftermarket devices.
Related Codes
Other Network Codes
- U0002High Speed CAN Communication Bus Performance
- U0003High Speed CAN Communication Bus (+) Open
- U0004High Speed CAN Communication Bus (+) Low
- U0005High Speed CAN Communication Bus (+) High
- U0006High Speed CAN Communication Bus (-) Open
- U0007High Speed CAN Communication Bus (-) Low
- U0008High Speed CAN Communication Bus (-) High
- U0009High Speed CAN Communication Bus Shorted Together
- U0010Medium Speed CAN Communication Bus
- U0028Vehicle Communication Bus A Performance
U0001 on Other Vehicles
Nissan 200SX
1995-1998 1.6L I4 GA16DE
Nissan 200SX SE-R
1995-1998 2.0L I4 SR20DE
Nissan 240SX
1995-1998 2.4L I4 KA24DE
Nissan 300ZX
1990-1996 3.0L V6 VG30DE
Nissan 300ZX Twin Turbo
1990-1996 3.0L Twin-Turbo V6 VG30DETT
Nissan 350Z
2003-2006 3.5L V6 VQ35DE
Nissan 350Z
2007-2009 3.5L V6 VQ35HR
Nissan 370Z
2009-2020 3.7L V6 VQ37VHR
Common Questions
What does code U0001 mean on a 2007-2012 Nissan Altima?
U0001 stands for "High Speed CAN Communication Bus". General malfunction on the high-speed CAN bus network.
What are the symptoms of U0001 on a Nissan Altima?
Common symptoms of U0001 include: Multiple warning lights, Communication errors, Some systems inoperative, Scan tool communication issues.
What causes U0001 on a 2007-2012 Nissan Altima?
Common causes of U0001 include: CAN bus wiring damage, Shorted CAN H or CAN L wire, Missing termination resistor, Module failure pulling down bus, Aftermarket device interference.