Fault Received from External Node
2002-2007 Buick Rendezvous 3.5L V6
Description
A control module has received a fault notification from another module on the network, indicating a dependent system has a problem.
Symptoms
- Warning light for secondary system
- Cascading DTCs across modules
- Feature limited due to external fault
- System in reduced functionality mode
Common Causes
- Primary fault exists in another module
- Dependent system has active DTC
- Communication issue causing fault propagation
- Software glitch sending false fault signal
Diagnostic Steps
- Scan all modules for DTCs
- Find the primary fault code
- Address the original fault first
- Clear codes after primary repair
- Retest all systems
Repair Notes
This is a cascading code. Find and fix the original DTC in the source module first.
Related Codes
Other Network Codes
- U0001High Speed CAN Communication Bus
- 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
U2023 on Other Vehicles
Common Questions
What does code U2023 mean on a 2002-2007 Buick Rendezvous?
U2023 stands for "Fault Received from External Node". A control module has received a fault notification from another module on the network, indicating a dependent system has a problem.
What are the symptoms of U2023 on a Buick Rendezvous?
Common symptoms of U2023 include: Warning light for secondary system, Cascading DTCs across modules, Feature limited due to external fault, System in reduced functionality mode.
What causes U2023 on a 2002-2007 Buick Rendezvous?
Common causes of U2023 include: Primary fault exists in another module, Dependent system has active DTC, Communication issue causing fault propagation, Software glitch sending false fault signal.