What Does P044D Mean?
The EGR sensor 'C' circuit is reporting a voltage higher than the PCM's expected maximum threshold. This typically indicates an open ground wire, a signal wire shorted to the reference voltage, or a failed sensor. The PCM cannot accurately monitor EGR flow and will likely disable EGR function. The check engine light will illuminate.
Common Causes
30%
Open ground wire in the EGR sensor 'C' circuit
30%
Failed EGR sensor 'C' with open internal element pulling signal high
20%
Signal wire shorted to 5V reference wire in harness
15%
Corroded or disconnected connector at the sensor
5%
PCM sensor ground circuit issue
Diagnostic Steps
1
Check the EGR sensor 'C' signal voltage on live data. A high circuit code typically means the signal is above 4.5-4.9V.
2
Disconnect the EGR sensor connector. If the voltage drops to a mid-range value or fluctuates, the sensor has an open internal element and needs replacement.
3
If voltage remains high with the sensor disconnected, check for a short between the signal wire and the 5V reference wire in the harness. Measure resistance between these two wires at the harness connector—should be OL.
4
Verify the ground wire has continuity from the sensor connector back to the PCM ground pin. Resistance should be under 2 ohms. An open ground will pull the signal voltage high.
5
Check the sensor connector and PCM connector for backed-out pins, corrosion, or spread terminals that could cause an open circuit condition.
Estimated Repair Cost
$100 - $400
Parts + labor, varies by vehicle and location
The EGR sensor 'C' circuit is reporting a voltage higher than the PCM's expected maximum threshold. This typically indicates an open ground wire, a signal wire shorted to the reference voltage, or a failed sensor. The PCM cannot accurately monitor EGR flow and will likely disable EGR function. The c...
The most common cause of P044D (Exhaust Gas Recirculation Sensor "C" Circuit High) is: Open ground wire in the EGR sensor 'C' circuit
Typical repair costs for P044D range from $100 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive for short distances. Without proper EGR operation, NOx emissions increase. No immediate safety risk, but prolonged operation could elevate combustion temperatures. Schedule repair at your convenience.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P044D to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
EGR / Emissions System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
