What it means
Vehicle communication bus G is reporting a performance fault. The code does not identify the cause or which vehicle functions may be affected.
At a glance
- Usually lights the warning light of the system that lost communication
How it works
Bus G carries messages among the modules connected to that vehicle network. This performance code means the reporting module detects bus G communication that is not operating as expected, without identifying a specific conductor or short condition.
Common causes
Most likely first.
- Damaged, loose, or corroded bus wiring or connectors
- A control module disrupting bus communication
- Bus termination or gateway fault
Symptoms
- Communication faults in modules using bus G
- Warning lights or messages
- Functions relying on bus G may be unavailable
How to diagnose it
- Scan all modules and save freeze-frame data and related codes to see when bus G performance degraded and which modules were affected.
- Use the vehicle network diagram to identify bus G's connected modules, gateways, and termination points.
- Inspect accessible bus G wiring and connectors for intermittent contact, corrosion, moisture, or physical damage.
- Follow the manufacturer's network procedure to assess bus G signal and termination performance under the conditions recorded in freeze-frame data.
- If wiring and termination check out, isolate bus G modules as directed by the manufacturer to find a device or gateway disrupting communication.
Common fixes
- Clean and secure an intermittent or corroded bus G connector.
- Repair damaged bus G wiring or a poor connection at a splice.
- Correct a confirmed bus G termination or gateway fault.
- Repair or replace a module shown by testing to impair bus G performance.
Can I keep driving?
A short trip may be possible if the vehicle behaves normally and bus G serves only noncritical functions, but communication performance may deteriorate and disable features. Stop if warnings or behavior indicate that an essential driving system is affected.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.