What it means
Same as P242D on bank 2 sensor 5. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Bank 2 sensor 5 measures exhaust gas temperature and sends a signal on a circuit monitored by the control module. P2487 sets when the signal is higher than expected, which can happen if the signal circuit is shorted to a supply; it describes a high signal, not a low one.
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
How to diagnose it
- Record freeze-frame data and compare bank 2 sensor 5 live data with other available exhaust-temperature readings to confirm whether its signal is implausibly high.
- Inspect the bank 2 sensor 5 connector for corrosion, loose contact, or displaced terminals.
- Trace the bank 2 sensor 5 wiring for pinching, melted insulation, or contact with a power feed near the exhaust or moving parts.
- Using the manufacturer's wiring information, check the signal circuit for a short to supply and inspect the related connections.
- If the circuit is intact, test bank 2 sensor 5 against the manufacturer's specification before replacing it.
Common fixes
- Secure the bank 2 sensor 5 connector and correct poor terminal contact.
- Repair pinched or melted wiring that is shorting the signal to a supply.
- Replace damaged connector terminals or repair the affected circuit connections.
- Replace bank 2 sensor 5 if it fails the specified tests after wiring faults are ruled out.
Can I keep driving?
If the vehicle drives normally and the check-engine light is steady, a short, gentle drive is usually reasonable while you arrange diagnosis. Avoid heavy loads if power changes because the control module may be relying on an unreliable exhaust-temperature signal.
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.