Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with the system that helps clean the exhaust in your car. It's like if the cleaning spray for your windshield wipers wasn't working right.
The P202F code indicates an issue with the circuit that controls the delivery of diesel exhaust fluid, which is used to reduce emissions in diesel engines.
The P202F code is triggered when the Engine Control Module (ECM) detects a range or performance problem in the reductant or regeneration supply control circuit. This circuit is responsible for managing the flow of diesel exhaust fluid (DEF) to the Selective Catalytic Reduction (SCR) system, which helps reduce nitrogen oxide emissions.
• Check engine light is on
• Reduced engine performance
• Increased emissions
• Faulty reductant pump
• Defective reductant injector
• Wiring issues in the reductant control circuit
Reductant: A substance used to reduce emissions in diesel engines, often diesel exhaust fluid.
SCR: Selective Catalytic Reduction, a system used to reduce nitrogen oxide emissions in diesel engines.
• Scan the vehicle for additional codes.
• Inspect the wiring and connectors in the reductant control circuit.
• Test the reductant pump and injector for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the faulty reductant pump.
• Replace the defective reductant injector.
• OBD-II scanner
• Multimeter
• Wrench set
$200 - $600
Moderate
• Ford F-250
• Chevrolet Silverado 2500
• Dodge Ram 2500
• Regularly check the DEF level.
• Perform routine maintenance on the exhaust system.
• Inspect wiring for any signs of wear or damage.
Sensor Issue
• Take the vehicle to a professional mechanic for a thorough diagnosis.
• Avoid ignoring the check engine light to prevent further damage.
Check with your vehicle manufacturer for warranty coverage on emissions-related components.
This code has become more common with the introduction of stricter emissions standards for diesel engines.
Moderate – It should be addressed soon to avoid increased emissions and potential engine performance issues.
Operating a vehicle with this issue may not meet emissions standards, which could lead to fines or penalties.
• Engine at operating temperature
• Vehicle running at idle
The reductant pump and injector are typically located near the diesel exhaust fluid tank, often at the rear of the vehicle.
Q: Can I drive my car with a P202F code?
A: You can drive for a short period, but it's best to fix it soon to avoid increased emissions and potential engine issues.
Q: What happens if I ignore the P202F code?
A: Ignoring the code can lead to higher emissions, reduced fuel efficiency, and potential damage to the exhaust system.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
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.
View on Amazon
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.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.