P044C on Lincoln: How to Diagnose & Fix
Exhaust Gas Recirculation Sensor "C" Circuit Low
1 Lincoln model · 1 documented issue · 1 critical
P044C on Lincoln by model: symptoms, diagnosis and fix
Some 2.0L EcoBoost Nautilus SUVs may show low coolant, white smoke from the tailpipe, an over-temperature warning, an external coolant leak and/or a check-engine light with stored codes. Ford attributes this to the exhaust gas recirculation (EGR) cooler and/or PCM software settings. It affects 2019–2020 Lincoln Nautilus with the 2.0L EcoBoost engine; bulletin 20-2234 also covers the 2019–2020 Ford Edge 2.0L.
Common Symptoms
- Low coolant level
- White smoke from the tailpipe
- Over-temperature warning
- External coolant leak
- Check-engine light
How to Fix
Have a dealer confirm the symptoms and codes. Bulletin 20-2234 has vehicles built on or before 9-Jul-2020 get the latest PCM software first, then a cooling-system pressure test and inspection of the EGR cooler for damage or internal leaks; if the EGR cooler leaks, the EGR cooler and EGR outlet tube are replaced. If the cooler does not leak, the technician follows standard workshop-manual diagnosis. Normal warranty rules apply; this is not a recall or a promise of free repair.
Sources for this issue (2)
P044C code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P044C mean on a Lincoln?
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. On Lincoln it is documented across 1 model: Nautilus.
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 on a Lincoln?
Repair costs vary widely with the root cause and Lincoln model; each issue on this page carries its own estimate where one is published.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.