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 there is a problem with the part of the car that helps clean the exhaust. It's like when a fan in your room stops working and can't blow air anymore.
The P2059 code indicates an issue with the electrical circuit that controls the air pump used in the reductant injection system, which is part of the vehicle's emissions control system.
The reductant injection air pump is part of the Selective Catalytic Reduction (SCR) system, which reduces nitrogen oxide emissions. This code is triggered when the Engine Control Module (ECM) detects an open or malfunction in the control circuit of the air pump responsible for injecting air into the reductant system.
• Check Engine Light illuminated
• Possible decrease in fuel efficiency
• Increased emissions
• Faulty reductant injection air pump
• Open or shorted wiring in the air pump circuit
• Faulty ECM
Reductant: A substance used to reduce pollutants in the emissions system.
SCR: Selective Catalytic Reduction, a system used to reduce nitrogen oxide emissions.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the air pump for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the reductant injection air pump if faulty.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $500
Moderate
• Ford F-250
• Chevrolet Silverado 2500
• Dodge Ram 2500
• Regular maintenance of the emissions system
• Check wiring and connectors periodically
• Use quality fuel to reduce emissions system strain
Sensor Issue
• Have the emissions system checked regularly.
• Address Check Engine Light issues promptly.
Emissions-related components may be covered under the vehicle's emissions warranty.
P2059 is a relatively common code in vehicles equipped with SCR systems, particularly in diesel engines.
Moderate – Should be addressed soon to prevent increased emissions and potential damage to the emissions system.
Driving with increased emissions may violate local emissions laws and contribute to air pollution.
• Engine running
• Vehicle at operating temperature
The reductant injection air pump is typically located near the SCR catalyst or along the exhaust system.
Q: Can I drive with a P2059 code?
A: You can drive short distances, but it's best to fix it soon to avoid increased emissions and potential damage.
Q: Will a P2059 code affect my vehicle's performance?
A: It may lead to increased emissions and decreased fuel efficiency, but it might not immediately affect performance.
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.
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.