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 car's system that helps reduce pollution isn't getting the power it needs to work.
The reductant pump is part of the vehicle's emissions control system, which helps reduce harmful gases. This code indicates that the electrical circuit supplying power to the pump is not working properly.
The P05F2 code is triggered when the Engine Control Module (ECM) detects that the supply voltage to the reductant pump circuit is stuck in the 'off' position. This means the pump is not receiving the necessary power to function, which can lead to increased emissions.
• Check Engine Light illuminated
• Increased vehicle emissions
• Possible reduction in engine performance
• Blown fuse in the reductant pump circuit
• Faulty reductant pump relay
• Wiring issues or poor connections in the pump circuit
Reductant Pump: A component that pumps diesel exhaust fluid into the exhaust system to reduce emissions.
ECM: Engine Control Module, the computer that controls engine functions.
• Check the fuse for the reductant pump circuit and replace if necessary.
• Inspect the reductant pump relay for proper operation.
• Examine wiring and connections for damage or corrosion.
• Replace any blown fuses in the circuit.
• Replace or repair the reductant pump relay if faulty.
• Repair or replace damaged wiring or connectors.
• Multimeter
• OBD-II scanner
• Basic hand tools
$100 - $300
Moderate
• Chevrolet Silverado
• GMC Sierra
• Ford F-250
• Regularly inspect and maintain the vehicle's electrical system.
• Ensure all fuses and relays are in good condition.
• Keep wiring and connectors clean and free from corrosion.
Sensor Issue
• Have the vehicle inspected by a professional mechanic.
• Avoid driving the vehicle excessively until the issue is resolved.
Check with the vehicle manufacturer for warranty coverage on emissions-related components.
This code has been associated with issues in vehicles equipped with advanced emissions control systems, particularly in diesel engines.
Moderate – It is important to address this issue to maintain vehicle emissions compliance and performance.
Driving with this code may lead to increased emissions, which can be illegal in some areas.
• Engine running
• Vehicle at normal operating temperature
The reductant pump is typically located near the diesel exhaust fluid tank.
Q: Can I drive with a P05F2 code?
A: It's not recommended as it can lead to increased emissions and potential engine performance issues.
Q: How can I reset the P05F2 code?
A: After fixing the issue, you can use an OBD-II scanner to clear the code. If the problem persists, the code will return.
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.