What it means
The EGR cooler bypass valve on bank 2 - routes EGR around the cooler during cold-start to keep cabin and engine warm-up fast - has an open control circuit.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
The bank 2 EGR cooler bypass valve routes exhaust gas around the cooler when the engine is cold, supporting faster warm-up. The controller monitors the valve's control circuit, and this code sets when that circuit is open, such as from broken wiring, a backed-out connector pin, or a failed connection inside a component.
Common causes
Most likely first.
- Open in valve or wiring
- Pin pushed back out of connector body
- Cracked solder joint inside the module or sensor
Symptoms
- Check engine light on
- Pinging or knocking under load
- Power loss and hesitation
- Possible rough idle
- Failed emissions inspection (NOx)
How to diagnose it
- Save freeze-frame data and check for related EGR codes or live data showing whether the bank 2 bypass responds to commands.
- With the exhaust cool, inspect the bank 2 bypass valve connector and harness for disconnected plugs, pushed-back pins, heat damage, or broken wires.
- Check continuity through the valve control circuit and its connections to locate an open, using the wiring diagram to identify the correct terminals.
- Test the bank 2 bypass actuator or valve circuit against the manufacturer's specifications to distinguish a wiring break from an open component.
- If the external circuit and actuator pass, inspect the relevant controller connection for a damaged terminal or internal open.
Common fixes
- Reconnect the bank 2 bypass valve plug and secure its wiring.
- Repair an open or heat-damaged section of the control harness.
- Replace a backed-out or damaged connector terminal.
- Replace the bank 2 bypass valve or actuator if it has an open circuit.
Can I keep driving?
The vehicle may have reduced power, hesitation, rough idle, or knocking under load, and emissions can rise. Avoid heavy loads if it runs poorly, and stop driving if severe knocking or loss of power makes it unsafe.
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.