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 computer in your car has detected a problem with the sensor that tells it where the pump for the special fluid that cleans the exhaust is. It's like a game of hide and seek where the seeker can't find the hider because the hider is too far away.
The P2AD9 code is triggered when the Engine Control Module (ECM) detects a high voltage signal from the reductant pump motor position sensor circuit, indicating a potential issue with the sensor or its circuit.
The reductant pump motor position sensor monitors the position of the pump motor used in the Selective Catalytic Reduction (SCR) system. This system reduces harmful emissions by injecting a urea-based solution (DEF) into the exhaust. A high circuit signal could indicate an open circuit, faulty sensor, or wiring issues.
• Check Engine Light illuminated
• Possible reduction in engine performance
• Increased emissions
• Faulty reductant pump motor position sensor
• Open or shorted wiring in the sensor circuit
• Poor electrical connection at the sensor or ECM
ECM: Engine Control Module
SCR: Selective Catalytic Reduction
DEF: Diesel Exhaust Fluid
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the reductant pump motor position sensor for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the reductant pump motor position sensor.
• Clear the code and test drive the vehicle to ensure the issue is resolved.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Ford F-250
• Chevrolet Silverado
• Ram 2500
• Regularly inspect and maintain the SCR system.
• Ensure proper DEF fluid levels and quality.
• Check wiring and connectors for wear and tear.
Sensor Issue
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional if unsure.
• Regular maintenance can prevent such issues.
Check with your vehicle manufacturer for warranty coverage on emissions-related components.
The P2AD9 code is relatively uncommon but can occur in vehicles equipped with SCR systems, especially if maintenance is neglected.
Moderate – The vehicle can still be driven, but emissions may be higher than normal, and performance could be affected.
Driving with a malfunctioning emissions system may violate emissions laws and contribute to environmental pollution.
• Engine running
• Vehicle in closed-loop mode
The reductant pump motor position sensor is typically located near the DEF tank or the SCR system under the vehicle.
Q: Can I drive with a P2AD9 code?
A: Yes, but it's advisable to address the issue soon to avoid increased emissions and potential engine performance issues.
Q: What is the SCR system?
A: The Selective Catalytic Reduction (SCR) system reduces harmful emissions by injecting a urea-based solution into the exhaust stream.
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