Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
Your car's exhaust system is getting too hot when it's trying to clean itself, like when an oven gets too hot during self-cleaning.
The code indicates that the temperature at the inlet of the Selective Catalytic Reduction (SCR) NOx catalyst is too high during the particulate filter regeneration process.
The SCR system is part of the vehicle's emissions control system designed to reduce NOx emissions. During the regeneration of the diesel particulate filter (DPF), the exhaust temperature is increased to burn off soot. If the temperature at the SCR catalyst inlet exceeds safe limits, it triggers the P214B code.
• Check engine light is on
• Reduced engine performance
• Increased emissions
• Faulty temperature sensor
• Malfunctioning SCR catalyst
• Issues with the exhaust system
SCR: Selective Catalytic Reduction
NOx: Nitrogen Oxides
DPF: Diesel Particulate Filter
• Check for additional codes
• Inspect the temperature sensor and wiring
• Verify the operation of the SCR system
• Replace faulty temperature sensor
• Repair or replace SCR catalyst
• Fix any exhaust system leaks
• OBD-II scanner
• Multimeter
• Infrared thermometer
$200 - $1000
Moderate
• Ford F-250
• Chevrolet Silverado
• Ram 2500
• Regular maintenance of the exhaust system
• Use of high-quality diesel fuel
• Timely replacement of filters
Sensor Issue
• Avoid driving with the check engine light on
• Schedule a diagnostic check with a professional
• Monitor vehicle performance for any changes
Check with your vehicle manufacturer for emissions-related warranties.
This code has become more common with the increased use of SCR systems in diesel engines.
Moderate – Should be addressed soon to prevent further damage.
Ignoring emissions-related issues can lead to legal penalties and increased pollution.
• Vehicle at operating temperature
• Particulate filter regeneration in progress
The SCR catalyst is located in the exhaust system, typically near the DPF.
Q: Can I drive with a P214B code?
A: It's not recommended as it may lead to further damage and increased emissions.
Q: How can I prevent this code?
A: Regular maintenance and using quality fuel can help prevent this issue.
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A wired color-screen reader with readiness hotkeys, live data, code definitions, and data logging.
Good for emissions-related codes because it exposes readiness monitors and live powertrain data.
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Specialty · Smoke machine
Helpful for finding EVAP and vacuum leaks that are hard to see with visual inspection alone.
Helpful for tracking down EVAP and vacuum leaks that can trigger emissions faults.
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Specialty · O2 sensor socket
Helpful when the code points toward exhaust or oxygen-sensor work and space is tight.
Useful when the diagnosis points toward oxygen-sensor removal or replacement.
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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.