What it means
Same as P2495 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 Bank 2 EGR cooler bypass position sensor reports valve position to the control module. This code sets when its signal rises above the plausible circuit range, which can result from a signal shorted to supply or another circuit connection fault.
Common causes
Most likely first.
- Signal shorted to supply
- Connector pins corroded - high contact resistance
- Supply wire pinched against B+ source
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 inspect Bank 2 bypass sensor live data to confirm the signal is high when the code sets.
- Inspect the Bank 2 sensor connector and harness for pinched insulation or a signal wire touching a power supply.
- Check connector pins for corrosion, looseness, or poor contact that could distort the sensor circuit.
- Test the signal wire for a short to supply and verify the sensor reference and ground circuits against the manufacturer's specification.
- If the wiring checks pass, test Bank 2 sensor output against the manufacturer's specification before condemning the sensor.
Common fixes
- Secure or clean poor Bank 2 sensor connector contacts.
- Repair a pinched Bank 2 harness or signal wire shorted to supply.
- Repair a faulty sensor ground or reference connection.
- Replace the Bank 2 bypass position sensor if it produces an out-of-range signal with sound wiring.
Can I keep driving?
If the engine runs smoothly, a short, gentle drive is usually possible; avoid heavy loads if it pings, hesitates, or loses power. The fault can disrupt EGR control and increase NOx emissions.
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.