What it means
A fault is detected on the positive conductor of vehicle communication bus G; the code descriptor specifies an open circuit. Which functions are affected depends on the vehicle’s network design.
How it works
Bus G carries messages among its connected modules over positive and negative conductors. This code specifically reports an open electrical path on the bus G positive conductor, which can interrupt communication on that network.
Common causes
Most likely first.
- Open or damaged bus G positive wire
- Loose or corroded connector
- A module, gateway, or bus termination 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 for bus G communication codes and save freeze-frame data to identify which modules stopped responding and when.
- Use the vehicle network diagram to trace bus G's positive conductor, connectors, gateways, and connected modules.
- Inspect the positive wire and connectors for breaks, loose or backed-out terminals, corrosion, or harness damage.
- With power isolated as directed by the manufacturer, test continuity along the bus G positive conductor and check for unintended shorts.
- If the wire and connectors pass, use the manufacturer's procedure to check gateway connections, termination, and modules that could interrupt the positive path.
Common fixes
- Reconnect or clean a loose or corroded bus G positive connector.
- Repair an open or damaged section of the bus G positive wire.
- Repair a displaced terminal or damaged connector on the positive path.
- Repair a confirmed gateway, termination, or module fault interrupting bus G.
Can I keep driving?
If the vehicle remains controllable and only noncritical functions are affected, a short trip may be possible, but bus G functions may be unavailable. Do not drive if the affected network controls braking, steering, powertrain, or another safety-critical function.
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.