Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with the sensor that checks the pressure of the fuel used to clean up the exhaust from your car. It's like a sensor that tells you if your garden hose has enough water pressure, but for your car's exhaust system.
The P20DD code is triggered when the Engine Control Module (ECM) detects a malfunction in the exhaust aftertreatment fuel pressure sensor circuit.
The exhaust aftertreatment system in diesel engines uses a fuel pressure sensor to monitor the pressure of fuel used in the system. This sensor ensures the proper amount of fuel is being used to reduce emissions. If the ECM detects an issue with the sensor's circuit, it will set the P20DD code.
• Check Engine Light is on
• Decreased fuel efficiency
• Failed emissions test
• Faulty exhaust aftertreatment fuel pressure sensor
• Damaged or corroded wiring or connectors
• Faulty ECM
ECM: Engine Control Module
OBD-II: On-Board Diagnostics, Second Generation
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the exhaust aftertreatment fuel pressure sensor.
• Replace the faulty exhaust aftertreatment fuel pressure sensor.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Chevrolet Silverado
• Ford F-250
• Ram 2500
• Regularly inspect and maintain the exhaust system.
• Use high-quality fuel to prevent sensor clogging.
• Keep the vehicle's software up to date.
Sensor Issue
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional if unsure.
• Regular maintenance can prevent this issue.
Check with your vehicle manufacturer, as emissions-related components may be covered under warranty.
This code has become more common with the increased use of diesel particulate filters and selective catalytic reduction systems in modern diesel engines.
Moderate – It should be addressed to ensure proper vehicle emissions and performance.
Driving with a malfunctioning emissions system may violate local emissions laws and can lead to fines.
• Engine running
• Vehicle at operating temperature
The exhaust aftertreatment fuel pressure sensor is typically located near the exhaust system, often close to the diesel particulate filter or selective catalytic reduction system.
Q: Can I drive with a P20DD code?
A: While you can drive with this code, it's not recommended as it may affect your vehicle's emissions and performance.
Q: How can I prevent a P20DD code?
A: Regular maintenance and using high-quality fuel can help prevent this issue.
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