P2477
Exhaust Gas Temperature Sensor Circuit Intermittent/Erratic Bank 2 Sensor 4
Auxiliary emissions / exhaust temperature
Generic OBD-II
Low
What it means
P2477 means the exhaust gas temperature sensor on bank 2, sensor position 4, is sending an intermittent or erratic signal. The ECM uses this sensor to protect the catalyst and particulate filter and to manage regeneration, so a dropping signal usually pauses those functions. Because the fault is intermittent, it most often traces to chafed wiring or a poor connector rather than the sensor itself.
Low
Can I keep driving? Safe to drive normally in the short term; the ECM may pause DPF regeneration or limit power until it trusts the reading again.
Common symptoms
What you'll notice
- Check-engine light on
- DPF regeneration disabled or incomplete
- Occasional reduced power
- Often no everyday driving symptom
Common causes
Most likely first
- Chafed or loose EGT sensor wiring or connector (most common with intermittent faults)Likely
- Corroded or poor connector contactsCommon
- Failing exhaust gas temperature sensorCommon
- Exhaust-heat damage to the sensor harnessLess often
How to diagnose & fix
Work through it in order
- Wiggle-test the sensor harness while watching EGT live data for dropouts.
- Inspect the connector and wiring near the exhaust for chafing or heat damage.
- Measure the sensor's resistance against specification.
- Clean or repair corroded connectors.
- Replace the EGT sensor if the signal keeps cutting out.
FAQ
Quick answers
Is it safe to drive with P2477?+
Yes for normal short-term driving. The main effect is on exhaust-temperature monitoring and DPF regeneration, not on running the engine.
Can I just clear P2477?+
It will come back the next time the signal glitches. Because it is intermittent, focus on the wiring and connector first.
Related codes
Often seen with P2477
Read & clear P2477 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