Lost Communication with Diagnostic Gateway Module
2007-2007 Cadillac CTS 3.2L V6
The 2007 Cadillac CTS is equipped with a 3.2L V6 engine. Below you'll find detailed u0064 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
Cannot communicate with the diagnostic gateway that routes scan tool communication to vehicle buses.
Symptoms
- Scan tool cannot connect
- OBD port no communication
- Cannot read any DTCs
- Cannot perform diagnostics
Common Causes
- Gateway module power failure
- Gateway module failure
- CAN bus issue to gateway
- OBD port wiring damage
- Fuse blown
Diagnostic Steps
- Check gateway module fuse
- Test power and ground at gateway
- Check OBD port pin connections
- Test CAN wiring from OBD port to gateway
- Verify gateway module operation
Repair Notes
Check OBD port wiring and gateway module power supply. Common on VW/Audi vehicles.
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
U0064 on Other Vehicles
Common Questions
What does code U0064 mean on a 2007-2007 Cadillac CTS?
U0064 stands for "Lost Communication with Diagnostic Gateway Module". Cannot communicate with the diagnostic gateway that routes scan tool communication to vehicle buses.
What are the symptoms of U0064 on a Cadillac CTS?
Common symptoms of U0064 include: Scan tool cannot connect, OBD port no communication, Cannot read any DTCs, Cannot perform diagnostics.
What causes U0064 on a 2007-2007 Cadillac CTS?
Common causes of U0064 include: Gateway module power failure, Gateway module failure, CAN bus issue to gateway, OBD port wiring damage, Fuse blown.
Last updated: March 2026