P044B
EGR Sensor C Circuit Range/Performance
EGR / emissions
Generic OBD-II
Medium
What it means
P044B means the EGR temperature sensor "C" is reading outside its expected range or not tracking valve operation the way the ECM expects. The EGR system routes exhaust back into the intake to cut emissions, and this sensor confirms it's flowing. It's usually carbon buildup or a failing sensor — annoying and bad for a smog test, but it won't strand you.
Medium
Can I keep driving? Yes — the car will run and start normally, but expect occasional pinging under load and a likely emissions-test failure until it's fixed.
Common symptoms
What you'll notice
- Check-engine light on
- Occasional pinging or knock under load or at higher speeds
- Minor hesitation or rough running at times
- Failed emissions test
Common causes
Most likely first
- Carbon buildup restricting the EGR passages or valve (affects the temperature reading)Likely
- Faulty EGR temperature sensorCommon
- Damaged wiring, corroded connector, or poor connection at the sensorCommon
- Sticking or stuck EGR valveLess often
- ECM fault (rare)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data to see when the fault set (hot, cold, load).
- Inspect and clean the EGR valve, tube, and passages — carbon buildup is the most common cause.
- Test the EGR temperature sensor's resistance and check its wiring and connector for damage or corrosion.
- Verify the EGR valve opens and closes freely; replace the sensor or valve if faulty.
- Clear the code and re-test with a drive cycle.
FAQ
Quick answers
Is it safe to drive with P044B?+
Generally yes — this is an emissions performance code, not a no-start. It's fine to drive short-term, but persistent EGR faults can cause pinging and a failed smog test.
Can I just clear P044B?+
You can, but it will return until the carbon buildup, sensor, or wiring is repaired.
Related codes
Often seen with P044B
Read & clear P044B 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