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 is getting a low signal from a sensor that checks the pressure in the system that prevents gas fumes from escaping the fuel tank.
The EVAP system is designed to capture and recycle fuel vapors from the fuel tank. This code indicates that the pressure sensor or switch in the EVAP system is reporting a lower than expected voltage signal.
The EVAP (Evaporative Emission Control) system pressure sensor/switch C circuit is responsible for monitoring the pressure in the fuel vapor containment system. A 'circuit low' condition indicates that the voltage signal from the sensor is below the expected range, which could be due to a malfunctioning sensor, wiring issues, or a problem with the EVAP system itself.
• Check Engine Light is on
• Possible fuel odor
• Failed emissions test
• Faulty EVAP pressure sensor
• Wiring issues such as shorts or open circuits
• Faulty EVAP system components
EVAP: Evaporative Emission Control
OBD-II: On-Board Diagnostics, Second Generation
• Use an OBD-II scanner to confirm the code.
• Inspect the EVAP pressure sensor and related wiring for damage.
• Test the voltage and ground signals at the sensor.
• Replace the EVAP pressure sensor if faulty.
• Repair or replace damaged wiring or connectors.
• Inspect and repair other EVAP system components if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$100 - $300
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly inspect the EVAP system components.
• Ensure fuel cap is properly sealed.
• Perform routine vehicle maintenance.
Sensor Issue
• Have the vehicle inspected by a professional if the Check Engine Light is on.
• Avoid overfilling the fuel tank.
• Ensure the gas cap is tightly secured after refueling.
Check with your vehicle's manufacturer for warranty coverage on emissions-related components.
EVAP system codes have been common since the introduction of OBD-II systems, as emissions regulations have become stricter.
Moderate – While the vehicle may still operate, emissions could be higher than allowed, and it may fail an emissions test.
Driving with an illuminated Check Engine Light may result in failing emissions tests and could lead to increased emissions.
• Vehicle at operating temperature
• EVAP system pressure sensor circuit connected
The EVAP pressure sensor is typically located near the fuel tank or along the EVAP lines.
Q: Can I drive with a P2B7C code?
A: Yes, but it's recommended to have it checked soon to avoid potential emissions issues.
Q: Will a P2B7C code affect my car's performance?
A: It may not affect performance directly, but it could lead to increased emissions and fuel odor.
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Specialty · Smoke machine
Helpful for finding EVAP and vacuum leaks that are hard to see with visual inspection alone.
Helpful for tracking down EVAP and vacuum leaks that can trigger emissions faults.
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Specialty · O2 sensor socket
Helpful when the code points toward exhaust or oxygen-sensor work and space is tight.
Useful when the diagnosis points toward oxygen-sensor removal or replacement.
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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.