Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the part of the car that helps reduce pollution isn't getting hot enough to work properly.
The Selective Catalytic Reduction (SCR) system uses a catalyst to reduce harmful nitrogen oxide (NOx) emissions. For it to work efficiently, the inlet temperature must be within a certain range. This code indicates that the temperature is too low.
The P22FF code is triggered when the Engine Control Module (ECM) detects that the temperature at the inlet of the SCR catalyst is below the required threshold for optimal operation. This can affect the efficiency of the NOx reduction process.
• Check Engine Light is on
• Reduced fuel efficiency
• Increased emissions
• Faulty temperature sensor
• Exhaust leaks
• Malfunctioning SCR system
SCR: Selective Catalytic Reduction
NOx: Nitrogen Oxides
ECM: Engine Control Module
• Use an OBD-II scanner to confirm the code
• Inspect the temperature sensor and wiring
• Check for exhaust leaks
• Replace or repair the temperature sensor
• Fix any exhaust leaks
• Ensure proper operation of the SCR system
• OBD-II scanner
• Multimeter
• Wrench set
$150 - $500
Moderate
• Ford F-250
• Chevrolet Silverado
• Dodge Ram 2500
• Regular maintenance of the exhaust system
• Timely replacement of sensors
• Use high-quality fuel
Sensor Issue
• Do not ignore the Check Engine Light
• Seek professional diagnosis if unsure
• Monitor fuel efficiency
Check with your vehicle manufacturer for warranty coverage on emissions-related components.
This code has become more common with the increasing use of SCR systems in diesel engines to meet emissions standards.
Moderate – It should be addressed soon to ensure emissions compliance and avoid further issues.
Operating a vehicle with increased emissions may violate environmental regulations.
• Engine at operating temperature
• Vehicle driven under normal conditions
The SCR catalyst is located in the exhaust system, usually near the rear of the vehicle.
Q: Can I drive with a P22FF code?
A: You can drive, but it's best to fix the issue soon to avoid increased emissions and potential engine damage.
Q: Will a P22FF code affect my vehicle's performance?
A: It may lead to reduced fuel efficiency and increased 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.