P2489
Exhaust Gas Temperature Sensor Circuit Intermittent/Erratic Bank 2 Sensor 5
Auxiliary emissions (exhaust temperature)
Generic OBD-II
Medium
What it means
P2489 means the exhaust gas temperature sensor on bank 2, position 5, is producing an intermittent or erratic signal — the reading cuts out or jumps unexpectedly. It usually traces to a loose or corroded connector or a chafed harness near the hot exhaust, and it can briefly disrupt the ECM's control of DPF regeneration.
Medium
Can I keep driving? Usually drivable, but the exhaust temperature signal is dropping out or jumping around — track down the loose connection before it disrupts DPF regeneration.
Common symptoms
What you'll notice
- Check-engine light on (sometimes intermittently)
- Occasional disabled or incomplete DPF regeneration
- Possible intermittent reduced power on some diesels
- Frequently no drivability change between events
Common causes
Most likely first
- Intermittent open in the exhaust gas temperature sensor wiring (bank 2, sensor 5)Likely
- Loose, corroded, or backed-out sensor connectorCommon
- Chafed harness shorting intermittently near the hot exhaustCommon
- Failing sensor with an internal intermittent faultLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and note the conditions when the fault sets.
- Wiggle-test the sensor connector and harness while watching live data for dropouts.
- Inspect the connector for corrosion, spread pins, or heat damage.
- Repair or reseat wiring and connectors as needed.
- Replace the sensor if the intermittent originates inside it, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2489?+
Short term usually yes, but intermittent readings can interrupt regeneration and, on some diesels, trigger brief power reduction. Fix the loose connection before it worsens.
Can I just clear P2489?+
You can, but an intermittent fault will set it again as soon as the wiring drops out — the connection or sensor still needs repair.
Related codes
Often seen with P2489
Read & clear P2489 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX