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 computer has detected a problem with a sensor that checks the pressure in the fuel system. It's like when a balloon doesn't have enough air, and the sensor is telling the computer that something similar is happening in the car.
The P24D7 code indicates that the EVAP (Evaporative Emission Control System) pressure sensor or switch B is reporting a low voltage signal to the engine control module (ECM). This could mean the sensor is not working properly or there is an issue with the wiring.
The EVAP system is responsible for capturing and recycling fuel vapors from the fuel tank to prevent them from escaping into the atmosphere. The pressure sensor/switch B monitors the pressure within the system. A low circuit code suggests that the voltage signal from the sensor is below the expected range, which could be due to a faulty sensor, wiring issue, or a problem with the ECM.
• Check Engine Light is on
• Possible fuel odor
• Decreased fuel efficiency
• Faulty EVAP pressure sensor/switch
• Wiring issues such as a short or open circuit
• Defective ECM
EVAP: Evaporative Emission Control System
ECM: Engine Control Module
• Use an OBD-II scanner to verify the code.
• Inspect the EVAP pressure sensor and its wiring for damage.
• Test the sensor's voltage and ground connections.
• Replace the EVAP pressure sensor if faulty.
• Repair or replace damaged wiring.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Wiring diagram
$100 - $300
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly inspect and maintain the EVAP system.
• Ensure proper sealing of the fuel cap.
• Check for wiring issues periodically.
Sensor Issue
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional if unsure.
• Avoid overfilling the fuel tank.
Check with the vehicle manufacturer for warranty coverage on emissions-related components.
The P24D7 code has become more common with the increased complexity of modern EVAP systems and stricter emissions regulations.
Moderate – While not immediately dangerous, it should be addressed to prevent further emissions issues.
Driving with an emissions-related fault may result in a failed emissions test and is illegal in some areas.
• Vehicle at operating temperature
• Fuel tank between 15% and 85% full
The EVAP pressure sensor is typically located near the fuel tank or along the EVAP lines.
Q: Can I drive with a P24D7 code?
A: While you can drive with this code, it's not recommended for long periods due to potential emissions issues.
Q: Will a P24D7 code affect my fuel economy?
A: Yes, it can lead to decreased fuel efficiency due to improper fuel vapor management.
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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.