P2407 — Evaporative Emission System Leak Detection Pump Sense Circuit #

Note: The exact wording of this code may vary depending on your vehicle’s manufacturer.

• P2407 – EVAP Leak Detection Pump Sense Circuit (Generic, All OEMs)
• P2407 – Leak Detection Pump Signal Circuit (BMW)
• P2407 – EVAP System Leak Detection Pump Sensor Circuit (Volkswagen/Audi)
• P2407 – EVAP System Leak Detection Pump Switch Signal (Toyota/Lexus)

Summary of Code P2407 #

The P2407 diagnostic trouble code (DTC) indicates an issue with the leak detection pump sense circuit in your vehicle’s Evaporative Emission Control System (EVAP). The EVAP system is designed to prevent fuel vapors from escaping into the atmosphere, protecting both the environment and your vehicle’s performance. When the engine control module (ECM) detects an abnormal signal or no signal at all from the leak detection pump’s sensor circuit, it sets this code. This can result from electrical problems, component failures, or even wiring issues. While not usually an emergency, ignoring this code can lead to increased emissions or future drivability concerns.

Common Symptoms for Code P2407 #

A P2407 code rarely triggers severe drivability issues by itself, but it is often the first sign that your EVAP system isn’t working as intended. You may experience:

• Check Engine Light (CEL) illuminated
• Noticeable fuel odor around the vehicle, especially near the fuel tank
• Potential failed emissions test (due to increased hydrocarbon output)
• Occasional rough idle (rarely)
• No noticeable symptom at all in some cases

Probable Causes for Code P2407 #

The most common causes for a P2407 code span from simple electrical interruptions to actual component failures. Here’s what typically triggers this DTC, listed from most to least likely:

1. Faulty leak detection pump (the pump that pressurizes the EVAP system to check for leaks)
2. Wiring issues (damaged, corroded, or loose connectors in the sense circuit)
3. Failed or contaminated leak detection pump sensor (the part monitoring pressure or vacuum changes)
4. Faulty or corroded ECM/PCM connection (the engine or powertrain control module not receiving the correct signal)
5. Blown fuse or open circuit related to the EVAP or leak detection pump
6. Aftermarket modifications (non-OEM parts or incorrect installations affecting the circuit)

Step-by-Step Diagnostic for Code P2407 #

Diagnosing a P2407 code requires a logical process. Think of it like tracing a river upstream: start at the obvious, then move toward the source. Here’s how a technician or a skilled DIYer would approach it:

• Check for additional codes (especially other EVAP or electrical DTCs)
• Visually inspect the leak detection pump and its wiring for obvious damage, corrosion, or loose connections
• Test for voltage and ground at the pump sense circuit connector with a multimeter
• Check the integrity of fuses related to the EVAP system
• Use a scan tool to command the leak detection pump on and off, and observe sensor feedback
• Test continuity of the sense circuit wiring back to the ECM/PCM
• Replace or test the leak detection pump sensor as specified by OEM procedures
• Clear codes and confirm repair by driving and rechecking with a scan tool

Possible Repairs for Code P2407 #

Once the root cause is identified, repair solutions for a P2407 code can range from simple to more involved. Each fix directly addresses a specific cause:

• Repair or replace damaged wiring/connectors in the leak detection pump sense circuit
• Replace the leak detection pump if it’s internally failed or sending erratic signals
• Replace the leak detection pump sensor if it’s malfunctioning or contaminated
• Clean or repair corroded ECM/PCM terminals and ensure proper pin fitment
• Replace blown fuses and repair any open circuits related to the EVAP system
• Correct improper aftermarket wiring or components that interfere with OEM circuit integrity

Can You Drive with Code P2407? #

Yes, but with limitations. While the P2407 code won’t typically leave you stranded or cause immediate drivability problems, it does signal that your vehicle’s emissions system isn’t fully functional. Prolonged driving with this code can increase environmental impact, may result in a failed inspection, and could eventually trigger other, more severe EVAP-related issues. If you notice a strong fuel smell or have other symptoms, address it as soon as possible for safety and compliance.

Vehicles Most Commonly Affected by P2407 #

While P2407 can appear across many makes and models, it’s most often reported in vehicles with sophisticated EVAP monitoring, including:

• BMW (particularly 3 Series and X Series, 2005–2014)
• Volkswagen/Audi (Jetta, Passat, A3, A4, 2006–2015)
• Toyota/Lexus (Camry, RAV4, ES, RX, 2007+)
• Ford (Escape, Focus, Fusion, various years)
• Chrysler/Jeep/Dodge (Grand Cherokee, Charger, Pacifica, 2007+)

However, any modern vehicle equipped with an EVAP leak detection pump could potentially set this code.

Common Mistakes & Best Practices for P2407 #

Misdiagnosing P2407 is easy if you skip steps or replace parts blindly. Here’s what to watch out for:

• Replacing the leak detection pump without checking wiring – wiring faults are often the real culprit
• Overlooking the connector condition – corrosion or bent pins can mimic sensor failure
• Ignoring OEM service information – always consult the specific wiring diagram and test procedures
• Clearing codes without fixing the cause – the code will return, sometimes with additional faults
• Using non-OEM parts – aftermarket sensors or pumps may not communicate properly with the ECM

Quick FAQ for Code P2407 #

Need fast answers? Here are a couple of common questions about P2407:

• Q: Will a P2407 code affect my gas mileage?
  A: Rarely, but if the EVAP system isn’t functioning, you might notice slight losses over time due to vapor leaks.
• Q: Can low fuel cause this code?
  A: Not directly, but running with low fuel frequently can stress the EVAP system and increase the chance of setting related codes.
• Q: Is it expensive to fix a P2407?
  A: Costs vary: simple wiring repairs are affordable, while replacing the leak detection pump or sensor can be pricier, especially with labor.