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 a sensor in your car that helps control pollution. It can't measure pressure correctly.
The P20DE code indicates that the sensor responsible for monitoring the fuel pressure in the exhaust aftertreatment system is not operating within its expected range.
The Exhaust Aftertreatment Fuel Pressure Sensor measures the pressure of the fuel used in the aftertreatment system. If the sensor's readings are outside the expected range, the engine control module (ECM) will trigger the P20DE code. This can affect the efficiency of the vehicle's emissions control system.
• Check Engine Light is on
• Decreased fuel efficiency
• Possible performance issues
• Faulty exhaust aftertreatment fuel pressure sensor
• Wiring issues or poor electrical connections
• 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 connections to the sensor.
• Test the sensor's voltage and resistance.
• Replace the faulty sensor.
• Repair or replace damaged wiring.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Ford F-250
• Chevrolet Silverado
• Ram 2500
• Regular maintenance of the exhaust system
• Ensure proper fuel quality
• Regularly check and clean electrical connections
Sensor Issue
• Have the vehicle inspected by a professional as soon as possible.
• Avoid driving long distances until the issue is resolved.
Check with your vehicle manufacturer for warranty coverage on emissions-related components.
This code has become more common with the increased use of advanced emissions control systems in modern vehicles.
Moderate – It should be addressed soon to prevent further emissions issues.
Driving with a malfunctioning emissions system can lead to increased pollution and may be illegal in some areas.
• Engine at operating temperature
• Vehicle in a safe, stationary position
The exhaust aftertreatment fuel pressure sensor is typically located near the exhaust system, often close to the catalytic converter or diesel particulate filter.
Q: Can I drive with a P20DE code?
A: It's not recommended to drive long distances as it may affect emissions and fuel efficiency.
Q: How can I reset the P20DE code?
A: You can use an OBD-II scanner to clear the code, but it's important to fix the underlying issue first.
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Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
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Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
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Fitment Required · Vehicle-fitment part
Relevant when catalyst-efficiency or emissions faults persist after proper diagnosis.
Catalyst-efficiency faults sometimes point toward converter problems after proper testing.
Catalytic converters are highly vehicle-specific and should not be purchased by code alone.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.