What it means
The EGR cooler bypass valve on bank 2 is stuck in the closed position. EGR gas always passes through the cooler, slowing engine warm-up and degrading cold-start emissions.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
The EGR cooler bypass valve on bank 2 routes exhaust gas either through the cooler or around it, depending on operating conditions. The control module monitors the valve's position or response and sets this code when the bank 2 valve remains closed when it is expected to move, leaving EGR gas routed through the cooler.
Common causes
Most likely first.
- Valve flap seized closed by soot
- Actuator linkage jammed in closed position
- Carbon or debris buildup preventing free movement
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
- Record freeze-frame data and check live data for the bank 2 bypass command and reported position to see when the valve fails to move.
- Locate the bank 2 EGR cooler bypass and inspect its connector and wiring for damage, looseness, or corrosion.
- With the engine cool, inspect the bank 2 valve linkage and flap for soot, carbon, or debris that could hold it closed.
- Use the manufacturer's scan-tool procedure to command the bank 2 bypass and observe whether the actuator and linkage move.
- If the valve is free but does not follow commands, test its actuator and position feedback circuit to the manufacturer's specification.
Common fixes
- Remove carbon or debris preventing the bank 2 bypass flap from moving.
- Repair a jammed or damaged bank 2 actuator linkage.
- Replace the bank 2 bypass valve or actuator if it remains seized closed.
Can I keep driving?
You may be able to drive gently if the engine runs normally and no temperature warning appears, but avoid heavy loads if it pings, hesitates, or loses power. The stuck bank 2 bypass can affect warm-up and emissions, and persistent knocking under load should be checked promptly.
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.