P044C
EGR Sensor C Circuit Low
EGR system
Generic OBD-II
Medium
What it means
P044C sets when the ECM sees an abnormally low voltage from the EGR valve's position (feedback) sensor "C" circuit. That sensor tells the computer how far the EGR valve is open, so a low or lost signal usually points to a wiring short, a failed sensor, or a bad connection rather than an engine-destroying fault.
Medium
Can I keep driving? Usually drivable — the car runs but may hesitate or ping under load, and it can fail an emissions test until fixed.
Common symptoms
What you'll notice
- Check-engine light on
- Pinging or knocking under acceleration or load
- Occasional rough idle or hesitation
- Failed emissions test
Common causes
Most likely first
- Short to ground or open in the EGR position-sensor wiringLikely
- Faulty EGR valve position (feedback) sensorCommon
- Corroded or loose sensor connectorCommon
- Carbon buildup affecting the EGR valve the sensor reports onLess often
- ECM fault (rare)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and inspect the EGR sensor connector and wiring for damage, corrosion, or a short to ground.
- Back-probe the sensor signal circuit and compare the reading against the specification while actuating the valve.
- Replace the EGR position sensor if the wiring checks out but the signal stays low.
- Clean the EGR valve and passages if carbon buildup is affecting valve movement. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P044C?+
Short-term yes. It won't strand you, but persistent EGR faults can cause pinging under load and will fail emissions, so repair it before long trips.
Can I just clear P044C?+
It will return once the drive-cycle monitor runs again if the sensor or wiring fault is still present. Fix the circuit first.
Related codes
Often seen with P044C
Read & clear P044C 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