OBD-II Generic Error Code P2403: How to Fix It

Q: Can I drive my car with a P2403 code?

Yes, in most cases you can drive your vehicle with a P2403 code. This code typically does not affect engine performance or drivability. However, your check engine light will remain on, and your vehicle will likely fail an emissions inspection. It is best to diagnose and repair the issue within a reasonable timeframe to prevent potential worsening of EVAP system components.

Q: What causes the P2403 code?

The P2403 code is most commonly caused by a failed or failing EVAP leak detection pump, a damaged or corroded electrical connector or wiring in the pump's sense circuit, a cracked or clogged charcoal canister, leaking EVAP hoses or connections, or a faulty fuel tank pressure sensor. In rarer cases, a failed engine control module (ECM) can also trigger this code.

Q: How much does it cost to fix a P2403 code?

The repair cost depends on the root cause. Replacing a damaged hose or repairing a wiring issue may cost $50–$150 in parts. A new EVAP leak detection pump typically costs $80–$250 for the part, with labor adding $100–$200 at a shop, bringing the total to $180–$450. A charcoal canister replacement can run $150–$400 with labor included. Getting a diagnostic scan at a shop typically costs $80–$150 and should be done first if you are not comfortable self-diagnosing.

Q: Will P2403 cause my car to fail an emissions test?

Yes. Any active check engine light code, including P2403, will cause your vehicle to fail an emissions inspection in most U.S. states and many countries. Even if the code is cleared just before the test, the EVAP readiness monitor must show 'complete' or 'ready' for the test to pass. The monitor will not reset until the vehicle completes a full drive cycle after repairs.

Q: Is P2403 the same as P0440 or other EVAP codes?

No, P2403 is specific to the leak detection pump sense circuit, meaning there is a problem with how the pump reports its status to the ECM. Codes like P0440 (EVAP system malfunction), P0442 (small leak detected), or P0455 (large leak detected) indicate actual fuel vapor leaks in the system, while P2403 points specifically to an electrical or mechanical failure of the pump itself. However, a failed pump can sometimes trigger both P2403 and other EVAP codes simultaneously.

Abstract

The P2403 error code means your vehicle's onboard diagnostic system has detected a fault in the EVAP (Evaporative Emission Control) leak detection pump sense circuit. This system is responsible for detecting fuel vapor leaks from your gas tank and fuel lines to prevent harmful emissions from escaping into the atmosphere. While this code won't usually leave you stranded, it can cause your car to fail an emissions test and should be addressed in a timely manner to avoid further damage to your EVAP system.