What it means
A general circuit fault on the position feedback sensor of the EGR cooler bypass valve on bank 2. EGR mixes inert exhaust into intake to lower combustion peak temperature — too little raises NOx, too much causes misfires and rough running.
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 directs exhaust around or through the cooler, while its position sensor reports valve movement to the control module. This general circuit code indicates a fault in the Bank 2 position-sensor circuit; the exact electrical failure may need diagnosis before the valve or sensor is blamed.
Common causes
Most likely first.
- Faulty bypass position sensor
- Open or damaged sensor wiring
- Loose or corroded connector
- Bypass valve or actuator binding
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
- Read freeze-frame data and check whether Bank 2 bypass position feedback is missing, implausible, or not changing.
- Inspect the Bank 2 sensor, actuator, connector, and wiring for damage, corrosion, loose pins, or heat exposure.
- Compare the Bank 2 commanded and reported bypass positions in live data, if available, and note whether feedback responds to a command.
- Test the Bank 2 sensor signal, reference, ground, and wiring continuity against the manufacturer's specification.
- If the electrical circuit checks out, check whether the Bank 2 bypass valve or actuator binds or fails to move.
Common fixes
- Secure or clean a loose or corroded Bank 2 sensor connector.
- Repair damaged Bank 2 sensor wiring or a poor circuit connection.
- Free a sticking Bank 2 bypass valve if it can be serviced.
- Replace the Bank 2 position sensor or actuator only after testing identifies it as faulty.
Can I keep driving?
If the engine runs normally, drive gently and watch for pinging, hesitation, or rough idle; avoid heavy loads if those symptoms appear. The fault can impair EGR control, raise NOx emissions, and lead to an emissions test failure.
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.