Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's special system that cleans the exhaust is getting too hot, which can be bad for the car and the environment.
The Selective Catalytic Reduction (SCR) system is designed to reduce nitrogen oxide emissions. This code indicates that the temperature at the outlet of the SCR NOx catalyst is higher than expected.
Code P214C is triggered when the Engine Control Module (ECM) detects that the temperature at the outlet of the SCR NOx catalyst has exceeded the maximum allowable threshold. This could be due to excessive exhaust flow, malfunctioning sensors, or issues with the SCR system itself.
• Check Engine Light is on
• Decreased fuel efficiency
• Possible engine performance issues
• Faulty NOx sensor
• Excessive exhaust flow
• Malfunctioning SCR system
SCR: Selective Catalytic Reduction
NOx: Nitrogen Oxides
• Use an OBD-II scanner to confirm the code.
• Inspect the NOx sensor for damage or faults.
• Check the SCR system for any blockages or damage.
• Replace the faulty NOx sensor.
• Repair or replace components of the SCR system.
• Clear the code and test drive to ensure the issue is resolved.
• OBD-II scanner
• Wrench set
• Multimeter
$200 - $800
Moderate
• Ford F-250
• Chevrolet Silverado
• Ram 2500
• Regular maintenance checks
• Use high-quality diesel exhaust fluid (DEF)
• Avoid excessive idling
Sensor Issue
• Have the vehicle inspected by a professional.
• Avoid long trips until the issue is resolved.
Check with manufacturer for emissions-related warranty coverage.
This code has become more common with the increased use of SCR systems in diesel vehicles to meet emissions standards.
Moderate – Addressing this issue promptly can prevent further damage to the SCR system.
Driving with this issue may lead to increased emissions, which can be illegal in some areas and harmful to the environment.
• Vehicle at operating temperature
• Consistent driving conditions
The SCR NOx catalyst is typically located in the exhaust system, downstream of the engine.
Q: What happens if I ignore this code?
A: Ignoring this code can lead to increased emissions and potential damage to the SCR system.
Q: Can I drive my car with a P214C code?
A: It's possible to drive short distances, but it's recommended to fix the issue as soon as possible to avoid further damage.
High-End · Full-system diagnostics
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Network faults often require full-system access instead of a generic code reader alone.
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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.