U0007
High Speed CAN Communication Bus (-) Low
2014-2021 Mazda Mazda6 2.5L I4
High SeverityNetworkGeneric (SAE)
Description
The CAN Low wire voltage is lower than expected, indicating a short to ground.
Symptoms
- Bus communication degraded
- Multiple DTCs stored
- Intermittent module dropouts
Common Causes
- CAN L shorted to ground
- Damaged wiring insulation
- Module fault pulling CAN L low
- Water damage
Diagnostic Steps
- Measure CAN L voltage
- Isolate modules to find fault source
- Inspect wiring for ground contact
- Check for water intrusion
Repair Notes
Repair the CAN L short to ground. Check for damaged wire insulation near metal brackets.
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
- U0008High Speed CAN Communication Bus (-) High
- U0009High Speed CAN Communication Bus Shorted Together
- U0010Medium Speed CAN Communication Bus
- U0028Vehicle Communication Bus A Performance
U0007 on Other Vehicles
Common Questions
What does code U0007 mean on a 2014-2021 Mazda Mazda6?
U0007 stands for "High Speed CAN Communication Bus (-) Low". The CAN Low wire voltage is lower than expected, indicating a short to ground.
What are the symptoms of U0007 on a Mazda Mazda6?
Common symptoms of U0007 include: Bus communication degraded, Multiple DTCs stored, Intermittent module dropouts.
What causes U0007 on a 2014-2021 Mazda Mazda6?
Common causes of U0007 include: CAN L shorted to ground, Damaged wiring insulation, Module fault pulling CAN L low, Water damage.