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 a part in the car that helps reduce pollution is not working because a valve is stuck closed.
The reductant injection valve is responsible for injecting a fluid that helps reduce emissions from the exhaust. If this valve is stuck closed, it cannot inject the fluid, leading to increased emissions.
The P208E code indicates that the Engine Control Module (ECM) has detected that the reductant injection valve for Bank 1 Unit 1 is not opening as it should. This valve is part of the Selective Catalytic Reduction (SCR) system, which reduces nitrogen oxide emissions by injecting a reductant, typically Diesel Exhaust Fluid (DEF), into the exhaust stream.
• Check Engine Light illuminated
• Increased exhaust emissions
• Possible reduction in engine performance
• Faulty reductant injection valve
• Electrical issues such as a short or open circuit in the valve wiring
• Build-up of deposits or clogging in the valve
Reductant: A substance used to reduce emissions, often Diesel Exhaust Fluid (DEF) in diesel engines.
SCR: Selective Catalytic Reduction, a technology used to reduce nitrogen oxide emissions.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for the reductant injection valve.
• Test the operation of the reductant injection valve.
• Clean or replace the reductant injection valve.
• Repair or replace damaged wiring or connectors.
• Replace the reductant injection valve if faulty.
• OBD-II scanner
• Multimeter
• Wrench set
$150 - $500
Moderate
• Ford F-250
• Chevrolet Silverado
• Ram 2500
• Regularly check and maintain the SCR system.
• Use high-quality Diesel Exhaust Fluid (DEF).
• Perform routine inspections for wiring and connectors.
Emission Control System
• Get the vehicle checked by a professional mechanic.
• Avoid ignoring the Check Engine Light as it may lead to more severe issues.
This issue may be covered under the vehicle's emissions warranty.
The P208E code has become more common with the increased use of SCR systems in diesel engines to meet stricter emissions standards.
Moderate – This issue should be addressed soon to prevent increased emissions and potential engine performance issues.
Driving with this code may lead to failing emissions tests and is not environmentally friendly.
• Engine running at operating temperature
• Vehicle in motion or under load
The reductant injection valve is typically located near the exhaust system, often near the catalytic converter.
Q: Can I drive with a P208E code?
A: It's possible to drive with this code, but it's not recommended as it can lead to increased emissions and potential engine performance issues.
Q: What happens if I ignore the P208E code?
A: Ignoring this code can lead to higher emissions, possible engine performance issues, and failing emissions tests.
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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.