Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car has a special valve that helps clean the exhaust. This valve is stuck open, which means it can't do its job properly.
The P24DF code indicates that the Reductant Purge Control Valve B is stuck in the open position, preventing proper control of the exhaust cleaning process.
The Reductant Purge Control Valve B is part of the vehicle's selective catalytic reduction (SCR) system, which reduces nitrogen oxide emissions. When this valve is stuck open, it can lead to improper dosing of the reductant (usually urea-based) into the exhaust stream, causing emissions issues and potential engine performance problems.
• Check engine light illuminated
• Reduced fuel efficiency
• Increased exhaust emissions
• Faulty reductant purge control valve
• Electrical issues such as damaged wiring or connectors
• Blockage or contamination in the valve or related components
Reductant: A substance, often urea-based, used in SCR systems to reduce nitrogen oxides in exhaust gases.
SCR: Selective Catalytic Reduction, a technology used to reduce vehicle emissions.
• Perform a visual inspection of the valve and related wiring.
• Use a scan tool to confirm the P24DF code and check for other related codes.
• Test the valve's operation and electrical connections.
• Replace the reductant purge control valve if faulty.
• Repair or replace damaged wiring or connectors.
• Clean any blockages in the valve or related components.
• OBD-II scan tool
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Ford F-250
• Chevrolet Silverado
• Ram 2500
• Regular maintenance of the exhaust system
• Use high-quality fuel and additives
• Inspect wiring and connectors periodically
Exhaust Emissions Control
• Address the issue promptly to avoid further emissions problems.
• Consult a professional mechanic if unsure about the repair process.
Check with the vehicle manufacturer for emissions-related warranty coverage.
This code has become more common with the adoption of SCR systems in diesel vehicles to meet stricter emissions standards.
Moderate – While the vehicle may still be drivable, emissions compliance and fuel efficiency can be affected.
Driving with a faulty emissions system may not comply with local emissions regulations and can result in fines.
• Engine at operating temperature
• Vehicle in a safe, stationary position
The Reductant Purge Control Valve B is typically located near the SCR catalyst or along the exhaust system.
Q: Can I drive with a P24DF code?
A: While you may be able to drive, it's best to fix the issue soon to avoid emissions problems.
Q: How do I clear the P24DF code?
A: After repairs, use an OBD-II scan tool to clear the code. If the issue is resolved, it should not return.
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Universal · Digital multimeter
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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.