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 filter that cleans the air before it comes out of the exhaust. Sometimes, this filter gets really hot, and this code means it's getting too hot when it's trying to clean itself.
The code P214D indicates that the temperature at the outlet of the Selective Catalytic Reduction (SCR) NOx catalyst is too high during the regeneration process of the Diesel Particulate Filter (DPF).
During the regeneration process, the Diesel Particulate Filter (DPF) burns off accumulated soot to clean itself. The SCR system, which reduces nitrogen oxides (NOx) emissions, monitors the temperature at its outlet. If this temperature exceeds the specified limit, the engine control module (ECM) sets the P214D code, indicating a potential issue with the regeneration process or the SCR system.
• Check Engine Light illuminated
• Reduced engine performance
• Increased fuel consumption
• Faulty temperature sensor
• Excessive soot accumulation in the DPF
• Malfunctioning SCR system
SCR: Selective Catalytic Reduction
DPF: Diesel Particulate Filter
NOx: Nitrogen Oxides
• Use an OBD-II scanner to verify the code.
• Inspect the temperature sensor and its wiring.
• Check for excessive soot in the DPF.
• Replace the faulty temperature sensor.
• Perform a forced regeneration of the DPF.
• Repair or replace faulty SCR components.
• OBD-II scanner
• Digital multimeter
• Infrared thermometer
$200 - $800
Moderate
• Ford F-250
• Chevrolet Silverado 2500
• Ram 2500
• Regularly service the DPF system.
• Use high-quality diesel fuel.
• Avoid short trips that prevent proper DPF regeneration.
Engine Performance
• Avoid driving the vehicle until the issue is resolved to prevent further damage.
• Consult a professional mechanic for accurate diagnosis and repair.
Check your vehicle's warranty coverage for emissions-related components.
This code has become more common with the increased use of SCR systems in diesel engines to meet emission standards.
High – Ignoring this issue can lead to more severe engine problems and increased emissions.
Driving with this code may result in failing emissions tests and could be illegal in some areas.
• Engine at operating temperature
• DPF regeneration process active
The SCR NOx catalyst is located in the exhaust system, downstream of the DPF.
Q: Can I drive with the P214D code?
A: It's not recommended as it may cause further damage and increase emissions.
Q: How often should the DPF be cleaned?
A: The DPF typically cleans itself during normal driving, but forced regeneration may be needed if the vehicle is frequently used for short trips.
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Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
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Fitment Required · Vehicle-fitment part
Relevant when catalyst-efficiency or emissions faults persist after proper diagnosis.
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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.