P041C
EGR Temperature Sensor B Circuit Low
EGR / emissions
Generic OBD-II
Medium
What it means
P041C means the EGR temperature sensor "B" circuit is reading abnormally low — usually a short to ground or a signal below its normal range. This sensor reports the temperature of recirculated exhaust gas so the ECM can verify EGR operation. It's an electrical sensor-circuit fault; the engine runs normally, but EGR monitoring and emissions are affected.
Medium
Can I keep driving? Driveable — this is an emissions monitoring sensor, so the car runs normally; the main consequence is a warning light and a likely emissions-test failure.
Common symptoms
What you'll notice
- Check-engine light on
- Likely failed emissions test
- Little or no change in driveability
- Possible related EGR fault codes
Common causes
Most likely first
- Faulty EGR temperature sensor BLikely
- Short to ground in the sensor signal wiringCommon
- Loose or corroded sensor connectorCommon
- Faulty ECM (rare)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and note the reported temperature.
- Inspect the sensor connector and wiring for shorts to ground or damage.
- Measure the sensor's resistance against its temperature spec.
- Replace the EGR temperature sensor B if it reads out of range.
- If wiring and sensor check out, evaluate the ECM. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P041C?+
Yes — it's a sensor and emissions fault rather than a driveability hazard, but it will likely fail an emissions test until fixed.
Can I just clear P041C?+
It returns once the ECM rechecks the circuit; repair the sensor or wiring first.
Related codes
Often seen with P041C
Read & clear P041C 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