Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's computer is having trouble getting a steady reading from a sensor that checks the temperature of the exhaust gases. It's like when a thermometer keeps changing its reading even though the temperature is the same.
The P04D2 code indicates that the Engine Control Module (ECM) has detected an intermittent or erratic signal from the Exhaust Gas Recirculation (EGR) Temperature Sensor C.
The EGR system helps reduce emissions by recirculating a portion of the exhaust gases back into the engine cylinders. The temperature sensor monitors the temperature of these gases to ensure proper functioning. An intermittent or erratic signal suggests that the sensor is not providing consistent data, which can affect engine performance and emissions.
• Check Engine Light is on
• Poor engine performance
• Increased emissions
• Faulty EGR temperature sensor
• Wiring issues such as frayed wires or poor connections
• Corrosion or damage at the sensor connector
EGR: Exhaust Gas Recirculation
ECM: Engine Control Module
• Use an OBD-II scanner to confirm the code
• Visually inspect the EGR temperature sensor and its wiring
• Test the sensor's resistance and compare it to specifications
• Replace the faulty EGR temperature sensor
• Repair or replace damaged wiring or connectors
• Clear the code and test drive the vehicle to ensure the issue is resolved
• OBD-II scanner
• Multimeter
• Basic hand tools (screwdrivers, wrenches)
$100 - $300
Moderate
• Ford F-150
• Chevrolet Silverado
• Dodge Ram
• Regular maintenance and inspection of the EGR system
• Ensure proper connections and clean contacts
• Use quality fuel to reduce carbon buildup
Sensor Issue
• Address the issue promptly to avoid engine performance problems
• Consult a professional mechanic if unsure about repairs
Check with your vehicle manufacturer; emissions-related components may have extended warranties.
This code has become more common with vehicles that have advanced emissions systems and sensors.
Moderate – While the vehicle may still be drivable, addressing this issue promptly is important to maintain engine performance and emissions standards.
Ignoring emissions-related codes can lead to failing emissions tests and increased pollution.
• Engine at operating temperature
• Vehicle running in closed-loop mode
The EGR temperature sensor is typically located near the EGR valve or in the exhaust manifold.
Q: Can I drive with a P04D2 code?
A: You can drive with this code, but it's advisable to fix it soon to avoid potential damage or increased emissions.
Q: What happens if I ignore the P04D2 code?
A: Ignoring the code can lead to poor engine performance, increased emissions, and potential damage to the EGR system.
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