P044C on 2019-2020 Lincoln Nautilus (Standard, Select, Reserve) — Exhaust Gas Recirculation Sensor "C" Circuit Low
1 vehicles · 1 makes · $600-$9,000 repair
Most Reported On
P044C is an OBD-II diagnostic trouble code meaning “Exhaust Gas Recirculation Sensor "C" Circuit Low.” A generic (SAE-defined) powertrain code that applies to 1996-and-newer vehicles of any make. The engine control module has detected a lower-than-expected voltage on the circuit for EGR sensor "C" — depending on the platform this is an EGR valve position or EGR temperature sensor. The EGR system recirculates a metered amount of exhaust back into the intake to lower combustion temperature and NOx, so a faulty feedback signal means the module cannot verify EGR flow. Expect a check engine light, possible rough idle, hesitation, or reduced fuel economy, and the vehicle will fail an OBD-II emissions test while the light is on. This code is most commonly reported on 2019-2020 Lincoln Nautilus (Standard, Select, Reserve), with repair costs ranging from $600 to $9,000.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
This is a powertrain code, so a basic OBD-II reader can read it. These read P044C.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple code reader for engine (P) codes on many compatible OBD-II vehicles. It does not support every vehicle or hybrid/EV application, and it does NOT read body, chassis or network codes; confirm exact-vehicle compatibility before buying.
- Read & clear engine (P) codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth scanner with a companion app that reads beyond the engine module — ABS, SRS and transmission — plus manufacturer-specific codes on many vehicles.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X V3.0 Elite OBD-II Scanner
by LAUNCH
Handheld scanner covering the four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level tablet with all-system coverage and bi-directional control, so you can command a module rather than only read it.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
What you can do yourself, and what needs a shop
Reading the code, clearing it, and watching whether it returns is a driveway job with the right scanner. These steps are not:
- Module programming or software updates — needs the manufacturer software or a J2534 pass-through with a paid subscription.
- Replacing a control module — most are VIN-programmed and immobilizer-registered, so a new one does nothing until it is coded to your car.
- Airbag/SRS component work — a stored fault can deploy a live device.
If the vehicle is still under warranty, check for an open recall or technical service bulletin before buying anything — the repair may already be covered.
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FAQ
What does P044C mean?
P044C stands for "Exhaust Gas Recirculation Sensor "C" Circuit Low." A generic (SAE-defined) powertrain code that applies to 1996-and-newer vehicles of any make. The engine control module has detected a lower-than-expected voltage on the circuit for EGR sensor "C" — depending on the platform this is an EGR valve position or EGR temperature sensor. The EGR system recirculates a metered amount of exhaust back into the intake to lower combustion temperature and NOx, so a faulty feedback signal means the module cannot verify EGR flow. Expect a check engine light, possible rough idle, hesitation, or reduced fuel economy, and the vehicle will fail an OBD-II emissions test while the light is on.
What are the most common causes of P044C?
The most common causes of P044C are: Failed EGR position or EGR temperature sensor providing incorrect feedback, Short to ground or open in the sensor signal or reference wiring, Corroded, damaged, or loose connector at the EGR sensor, Carbon buildup in the EGR valve, passages, or cooler causing the valve to stick, Faulty EGR valve assembly with an integrated sensor, Exhaust or intake leak near the EGR circuit skewing readings, Failed ECM/PCM (rare — verify sensor and wiring first). The specific cause varies by vehicle.
How much does it cost to fix P044C?
Repair costs for P044C range from $600 to $9,000, depending on the vehicle and root cause.
Which vehicles are affected by P044C?
Au7o has documented P044C across 1 vehicle models from 1 manufacturers: Lincoln.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.