P0546
Exhaust Gas Temperature Sensor Circuit High Bank 1 Sensor 1
Exhaust gas temperature
Generic OBD-II
Medium
What it means
P0546 means the exhaust gas temperature (EGT) sensor for bank 1, sensor 1 is sending an abnormally high signal, usually from a short-to-voltage, an open circuit, or a failing sensor. The EGT sensor protects the exhaust and, on diesels, manages particulate-filter regeneration. The engine keeps running, but power may be limited until the wiring or sensor is repaired.
Medium
Can I keep driving? Usually drivable — the engine runs, but the ECM loses accurate exhaust-temperature data, so some vehicles limit power or DPF regen; get it checked before long or heavy driving.
Common symptoms
What you'll notice
- Check-engine light on
- Reduced engine power or a limp mode on some vehicles
- Worse fuel economy
- On diesels, disabled or abnormal DPF regeneration
Common causes
Most likely first
- Short-to-voltage or open in the exhaust gas temperature (EGT) sensor circuitLikely
- Faulty EGT sensor reading high (bank 1, sensor 1)Common
- Loose or corroded sensor connectorCommon
- Harness chafed or melted against the hot exhaustLess often
- Rarely, a failed ECMLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and check the EGT sensor's reported temperature against actual exhaust temp on a scan tool.
- Inspect the sensor connector and wiring for a short-to-voltage or open circuit.
- Check the harness routing near the exhaust for melted or chafed insulation.
- Compare the sensor's resistance to spec; replace the EGT sensor if it reads out of range.
- If wiring and sensor are good, evaluate the ECM. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0546?+
Short-term usually, but some vehicles cut power or disable diesel particulate filter regeneration, and the ECM can't monitor exhaust temperature. Have it diagnosed soon.
Can I just clear P0546?+
It will return until the high-signal circuit fault or failed EGT sensor is repaired, since the ECM continuously monitors the exhaust temperature signal.
Related codes
Often seen with P0546
Read & clear P0546 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