What Does P041D Mean?
The PCM has detected that the exhaust gas recirculation temperature sensor B circuit voltage is above the maximum expected threshold. This typically indicates an open circuit in the sensor, its wiring, or its connector — causing the PCM to see a pulled-high voltage on the signal line. The driver will see the check engine light and EGR operation may be limited or disabled by the PCM.
Common Causes
35%
Open circuit in the EGR temperature sensor B or its connector (disconnected or broken wire)
30%
Failed EGR temperature sensor B with open thermistor element
20%
Corroded or spread terminal pins causing intermittent open connection
10%
Open ground circuit for the sensor preventing current flow
5%
Signal wire open due to heat damage near the exhaust
Diagnostic Steps
1
Check the scan tool EGR temperature sensor B voltage PID. A reading at or near 5V (or showing -40°F/-40°C) confirms a high/open circuit condition.
2
Inspect the sensor connector — ensure it is fully seated and latched. Check for spread or receded terminal pins that could prevent contact.
3
Disconnect the sensor and measure thermistor resistance. At room temperature, expect 50K-100K ohms. An infinite (OL) reading confirms an open thermistor — replace the sensor.
4
If the sensor resistance is within spec, check continuity of the signal wire from the sensor connector to the PCM connector pin. Also verify the ground wire has continuity to the PCM ground.
5
Inspect the wiring harness in areas exposed to exhaust heat. An open wire due to heat-damaged insulation and subsequent corrosion is common on sensors located near the exhaust manifold.
Estimated Repair Cost
$75 - $300
Parts + labor, varies by vehicle and location
The PCM has detected that the exhaust gas recirculation temperature sensor B circuit voltage is above the maximum expected threshold. This typically indicates an open circuit in the sensor, its wiring, or its connector — causing the PCM to see a pulled-high voltage on the signal line. The driver wil...
The most common cause of P041D (Exhaust Gas Recirculation Temperature Sensor "B" Circuit High) is: Open circuit in the EGR temperature sensor B or its connector (disconnected or broken wire)
Typical repair costs for P041D range from $75 to $300, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive for short trips. The PCM will disable or limit EGR operation, which increases NOx emissions. On some vehicles, this may result in a slight increase in combustion temperatures and possible light detonation under heavy load.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P041D to identify the root cause.
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Quick Info
Category
Powertrain
System
Exhaust Gas Recirculation (EGR) System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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