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 your car's computer has detected a problem with the part that injects a special liquid into the exhaust to help reduce pollution. It's like a squirt gun that's not working right.
The P2052 code indicates that the voltage in the circuit controlling the reductant injection valve is higher than expected, which can affect how the vehicle reduces emissions.
The reductant injection valve is part of the Selective Catalytic Reduction (SCR) system, which injects a urea-based fluid (DEF) into the exhaust stream to reduce NOx emissions. A high circuit condition means the electrical resistance is too high, possibly due to an open circuit or faulty component.
• Check Engine Light is on
• Reduced engine performance
• Increased emissions
• Faulty reductant injection valve
• Open or shorted wiring in the reductant injection valve circuit
• Faulty Engine Control Module (ECM)
SCR: Selective Catalytic Reduction, a system used to reduce emissions in diesel engines.
DEF: Diesel Exhaust Fluid, a fluid used in SCR systems to reduce emissions.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the reductant injection valve for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the reductant injection valve 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
• Ram 2500
• Regularly inspect and maintain the SCR system.
• Use high-quality DEF fluid.
• Avoid driving with a low DEF level.
Sensor Issue
• Address the issue promptly to avoid increased emissions.
• Consult a professional mechanic if unsure about the repair.
Check with the vehicle manufacturer for warranty coverage on emission-related components.
This code has become more common with the increased use of SCR systems in diesel vehicles.
Moderate – It should be addressed soon to ensure proper vehicle operation and emissions control.
Ignoring this code may result in failing emissions tests and contribute to environmental pollution.
• Engine at operating temperature
• Vehicle in closed-loop operation
The reductant injection valve is typically located near the exhaust system, often close to the SCR catalyst.
Q: Can I drive with a P2052 code?
A: While you can drive with this code, it's best to fix it soon to avoid increased emissions and potential damage to the SCR system.
Q: What is DEF fluid?
A: DEF (Diesel Exhaust Fluid) is a urea-based solution used in SCR systems to reduce NOx emissions from diesel engines.
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Universal · Digital multimeter
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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.