What Does P044A Mean?
The PCM has detected a general circuit fault with the exhaust gas recirculation (EGR) sensor 'C'. This third EGR sensor (typically a temperature or pressure sensor downstream in the EGR system) is providing a signal the PCM cannot interpret correctly. EGR system malfunction may cause increased NOx emissions and the check engine light will illuminate.
Common Causes
35%
Failed EGR sensor 'C' (open or shorted internally)
25%
Open or damaged wiring in the EGR sensor 'C' circuit
20%
Corroded or loose connector at the EGR sensor
15%
Excessive carbon buildup affecting sensor reading accuracy
5%
PCM sensor input circuit failure
Diagnostic Steps
1
With the key on engine off, check the EGR sensor 'C' voltage reading on the scan tool live data. A normal reading varies by type but is typically 0.5-4.5V for a pressure sensor or within a defined resistance range for a temperature sensor.
2
Disconnect the EGR sensor connector and measure the sensor resistance or voltage output (depending on sensor type). Compare to manufacturer specifications for the current ambient temperature.
3
Verify the 5V reference voltage is present at the harness connector (if applicable). Also check the signal ground wire for continuity back to the PCM.
4
Inspect the wiring harness for heat damage near the exhaust, chafing, or broken wires. EGR sensors are in high-heat areas prone to insulation degradation.
5
If the sensor is a temperature type, use a heat gun to warm it gradually while monitoring resistance changes—it should change smoothly and proportionally.
Estimated Repair Cost
$100 - $450
Parts + labor, varies by vehicle and location
The PCM has detected a general circuit fault with the exhaust gas recirculation (EGR) sensor 'C'. This third EGR sensor (typically a temperature or pressure sensor downstream in the EGR system) is providing a signal the PCM cannot interpret correctly. EGR system malfunction may cause increased NOx e...
The most common cause of P044A (Exhaust Gas Recirculation Sensor "C" Circuit) is: Failed EGR sensor 'C' (open or shorted internally)
Typical repair costs for P044A range from $100 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Generally safe to drive for short distances. EGR system faults increase NOx emissions and may cause slight engine performance changes. Prolonged driving without repair could lead to increased combustion temperatures and potential catalytic converter damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P044A to identify the root cause.
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Quick Info
Category
Powertrain
System
EGR / Emissions System
Difficulty
Type
Generic (SAE)
Recommended Tools
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