P2400 OBD-II Trouble Code: EVAP Leak Detection Pump Control Circuit/Open

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P2400 code

P2400 is a diagnostic trouble code (DTC) for "EVAP Leak Detection Pump Control Circuit/Open". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $114.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.0 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford $114.99 $20.0
Toyota $114.99 $20.0
BMW $124.99 $20.0
SCHEDULE P2400 DIAGNOSTIC Get a fair and transparent estimate upfront

P2400 code definition

EVAP Leak Detection Pump Control Circuit/Open

What the P2400 code means

Trouble code P2400 is set when the Engine Control Module (ECM) detects a problem on the circuit that controls the evaporative emissions (EVAP) leak detection pump, or ECM is not seeing the expected result when the leak detection pump is activated.

What causes the P2400 code?

There are a few different reasons why P2400 would set:

  • The most obvious would be that the leak detection pump motor has failed. A failure of the pump motor could cause an open or short circuit in the leak detection pump control circuit.

  • Next would be a leak or damage to the hoses that connect the pump to the EVAP system. This would cause a condition where the pump control circuit would be good, but the computer does not see the right reaction from the system.

  • The final problem could be with the wiring or the ECM itself.

What are the symptoms of the P2400 code?

The main symptom for this code is that the Check Engine Light will come on. There are no drivability problems typically associated with this code.

How does a mechanic diagnose the P02400 code?

As with any diagnosis, I recommend a visual inspection of all the components involved in the system that is Malfunctioning. Many times this visual check can save you time and avoid unnecessary diagnostics.

  • Look for broken wires or wires that have rubbed through the insulation. Also look for damage to hoses connected to the leak detection pump.

  • If no visible damage is visible it may be necessary to check the integrity of the hoses in the EVAP system by using a smoke machine to find small cracks or leaking seals.

  • Next, I would use a test light that uses an incandescent headlight bulb to check the power and ground supply to the pump. Disconnect the electrical connector and plug the test light into the terminals of the connector with the appropriate probes. Using a scan tool, command the leak detection pump on. You should see the test light shining very brightly. If it is dim that means there is a fault in the wiring that needs to be located.

If no faults are found in the wiring it may be possible that the power supply from the ECM may be at fault.

Common mistakes when diagnosing the P2400 code

  • As always, the most common mistake is replacing components without performing the correct diagnostics.

  • The next most common mistake would be not identifying a leak in the EVAP hoses that lead to and from the pump.

How serious is the P2400 code?

The P2400 trouble code is not a very serious code. The only problem is that this code will most likely fail you for an emissions test.

What repairs can fix the P2400 code?

  • The most common repair for this trouble code is to replace a faulty leak detection pump.

  • Next would be to repair a broken or leaking hose leading to or from the leak detection pump.

  • Finally, after those repairs, the next most common fix is to repair the wiring leading to the leak detection pump.

Need help with a P2400 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

Check Engine Light
trouble codes
P2400

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P2400 code.

SCHEDULE P2400 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(7400)

Rating Summary
6879
249
58
41
173
6879
249
58
41
173
 at YourMechanic

David

13 years of experience
393 reviews
David
13 years of experience
Chevrolet Malibu L4-2.4L - Check Engine Light is on Inspection - Marietta, Georgia
He explained everything to me in detail on what I needed to know about my car. Definitely recommend him for getting the job done.
 at YourMechanic

Raymond

37 years of experience
402 reviews
Raymond
37 years of experience
Toyota Camry L4-2.2L - Check Engine Light is on - Las Vegas, Nevada
Raymond did a great job however I was charged for two hours labor and he was only here less than 45 minutes. should I expect this on future appointments with your mechanic ?
 at YourMechanic

Shane

17 years of experience
217 reviews
Shane
17 years of experience
Volkswagen EuroVan V6-2.8L - Check Engine Light is on Inspection - Austin, Texas
Arrived on time. Explained the issues he found and how he will fix it. I have parts on order and will schedule an appointment to have Shane install the parts when they arrive.
 at YourMechanic

Kanstantsin

19 years of experience
51 reviews
Kanstantsin
19 years of experience
Ford F-150 V8-4.6L - Check Engine Light is on Inspection - Littleton, Colorado
Kanstantsin arrived early. Was very courteous and professional. Will highly recommend to anyone. Thank you Kanstantsin.


More related articles

P0772 OBD-II Trouble Code: Shift Solenoid E Stuck On
P0772 means that a problem in the shift solenoid was detected, usually in the form of an incorrect gear ratio due to low or dirty transmission fluid.
B1203 OBD-II Trouble Code: Fuel Sender Circuit Short To Battery
B1203 means a circuit in the fuel tank sender has shorted. This is likely caused by a faulty wire, or the fuel tank sender could be defective.
B1212 OBD-II Trouble Code: EIC Switch-2 Assembly Circuit Short To Ground
B1212 means a short circuit has been detected in the dashboard EIC, possibly due to wiring issues or a blown fuse.

Related questions

Check engine light with P1717 error code
The code does pertain to the transmission selector range switch. This switch tells the transmission what gear you are selecting. This code can be induced if the battery voltage got below 11 volts. I would suggest having the code cleared;...
After sensor replacement, 2nd diagnostic revealed P0139
No, it is not the catalyst. The P0139 code (https://www.yourmechanic.com/article/p0139-obd-ii-trouble-code-o2-sensor-circuit-slow-response-bank-1-sensor-2) is for the O2 sensor before the catalyst. The code is illuminated when the engine control module is testing the O2 sensor and it cuts the fuel to see if...
My van is misfiring. Can I drive 400 miles before changing them? I'm traveling home now
Hi and thanks for contacting YourMechanic. If the Check Engine Light says that your vehicle has a misfire, then you will need to check the spark plugs (https://www.yourmechanic.com/services/spark-plugs-replacement) and wires (https://www.yourmechanic.com/services/ignition-cable-spark-plug-wires-replacement). I suggest replacing the spark plugs if they have...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com