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 part of the car that checks if gas fumes are leaking out. It's like a smoke detector for gas leaks, and it's not working right.
The EVAP system is responsible for capturing fuel vapors from the gas tank and preventing them from escaping into the atmosphere. This code indicates a problem with the control circuit for the leak detection pump.
The P2DD9 code is triggered when the Engine Control Module (ECM) detects an issue with the performance of the control circuit for the EVAP system's leak detection pump. This pump is used to pressurize the EVAP system to check for leaks. A fault in the control circuit can prevent the system from performing this check properly.
• Check Engine Light is on
• Possible fuel odor
• Failed emissions test
• Faulty leak detection pump
• Damaged or corroded wiring or connectors
• Faulty ECM
EVAP: Evaporative Emission Control System, which prevents fuel vapors from escaping into the atmosphere.
ECM: Engine Control Module, the computer that controls the engine's functions.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the leak detection pump for proper operation.
• Replace the leak detection pump if faulty.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $500
Moderate
• Dodge Ram
• Jeep Grand Cherokee
• Chrysler 300
• Regularly inspect EVAP system components.
• Ensure gas cap is tightly sealed.
• Perform routine vehicle maintenance.
Sensor Issue
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional.
• Avoid overfilling the gas tank.
Check with your vehicle manufacturer, as some emissions-related components may be covered under warranty.
This code has been associated with issues in vehicles with aging EVAP systems, particularly in models known for EVAP-related problems.
Moderate – While not immediately critical, it should be addressed to prevent emissions issues and potential fuel vapor leaks.
Ignoring this code can lead to increased emissions and potential safety risks due to fuel vapor leaks.
• Vehicle must be at operating temperature.
• Perform tests in a well-ventilated area.
The leak detection pump is typically located near the fuel tank or within the EVAP canister assembly.
Q: What happens if I ignore this code?
A: Ignoring this code can lead to increased emissions and potential fuel vapor leaks, which can be a safety hazard.
Q: Can I drive my car with this code?
A: While the car may still be drivable, it's best to address the issue to avoid potential emissions problems and fuel vapor leaks.
High-End · Full-system diagnostics
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Network faults often require full-system access instead of a generic code reader alone.
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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.
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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 EVAP diagnosis points toward purge-flow or purge-control faults.
EVAP diagnosis often includes purge-flow and valve-control faults.
Confirm the failed valve and exact fitment before buying parts.
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.