Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
Your car has a special part that helps clean the air by reducing pollution. This code means that part isn't working right.
The Selective Catalytic Reduction (SCR) system is responsible for reducing nitrogen oxide emissions in diesel engines. This code indicates that the catalyst within the SCR system is not functioning properly.
The P24FE code is triggered when the Engine Control Module (ECM) detects that the SCR catalyst is not performing as expected. This could be due to a malfunction within the catalyst itself, issues with the DEF (Diesel Exhaust Fluid) injection system, or problems with the sensors monitoring the SCR system.
• Check Engine Light is on
• Reduced engine performance
• Increased exhaust emissions
• Faulty SCR catalyst
• DEF fluid quality issues
• Malfunctioning NOx sensors
SCR: Selective Catalytic Reduction
DEF: Diesel Exhaust Fluid
NOx: Nitrogen Oxides
• Use an OBD-II scanner to confirm the code.
• Inspect the SCR catalyst for damage.
• Check the quality and level of DEF fluid.
• Replace the SCR catalyst if faulty.
• Refill or replace DEF fluid if necessary.
• Replace malfunctioning NOx sensors.
• OBD-II scanner
• Wrench set
• NOx sensor tester
$500 - $2000
Difficult
• Ford F-250
• Chevrolet Silverado 2500
• Dodge Ram 2500
• Regularly check and refill DEF fluid.
• Perform routine maintenance on the exhaust system.
• Use high-quality DEF fluid.
Emission Control System
• Do not ignore the Check Engine Light.
• Have your vehicle inspected by a professional mechanic.
• Keep up with regular maintenance to avoid future issues.
Check with your vehicle manufacturer for warranty coverage on emissions-related components.
The introduction of SCR systems in diesel vehicles was part of stricter emissions regulations, leading to the development of codes like P24FE to monitor these systems.
High – This issue can lead to increased emissions and potential engine damage if not addressed promptly.
Operating a vehicle with a malfunctioning emissions system may be illegal and harmful to the environment.
• Engine running at operating temperature
• Vehicle driven under normal conditions
The SCR catalyst is located in the exhaust system, typically near the rear of the vehicle.
Q: Can I drive with a P24FE code?
A: It's not recommended to drive with this code for extended periods as it can lead to increased emissions and potential damage.
Q: What is DEF fluid?
A: DEF stands for Diesel Exhaust Fluid, a solution used in SCR systems to reduce nitrogen oxide emissions.
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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.