P0548
Exhaust Gas Temperature Sensor Circuit Low Bank 2 Sensor 1
Exhaust / EGT sensor
Generic OBD-II
Medium
What it means
P0548 means the ECM sees an abnormally low voltage from the exhaust gas temperature (EGT) sensor for bank 2, sensor 1. This sensor lets the computer monitor exhaust heat to protect the turbocharger and after-treatment. It's usually a wiring or sensor fault rather than an engine problem, so the car typically still drives normally.
Medium
Can I keep driving? Usually drivable — the engine runs normally, but on turbocharged or diesel vehicles the ECM may limit boost or regeneration to protect the exhaust, so repair it promptly.
Common symptoms
What you'll notice
- Check-engine light on
- No obvious driving symptoms in many cases
- Possible reduced power or limited boost on turbo/diesel engines
- Failed or incomplete diesel particulate filter regeneration (where fitted)
Common causes
Most likely first
- Faulty exhaust gas temperature sensor on bank 2Likely
- Damaged, chafed, or shorted wiring in the sensor circuitCommon
- Loose or corroded connector at the sensorCommon
- Failed engine control module (rare — check wiring first)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and inspect the bank 2, sensor 1 EGT sensor and its connector for heat damage or corrosion.
- Check the signal and ground wiring for shorts to ground or opens; a low signal often points to a shorted circuit or failed sensor.
- Compare the sensor's resistance/reading against the other EGT sensors when cold — a large mismatch confirms a bad sensor.
- Replace the EGT sensor if it reads out of range, then clear the code and re-test.
FAQ
Quick answers
Is it safe to drive with P0548?+
Generally yes for short trips, since it's a sensor-reporting fault. But the ECM uses exhaust temperature to protect the turbo and after-treatment, so don't ignore it on turbo or diesel vehicles.
Can I just clear P0548?+
You can clear it, but it will return until the sensor or its wiring is repaired, because the ECM continuously monitors the circuit.
Related codes
Often seen with P0548
Read & clear P0548 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