EVAP Leak Detection Pump Circuit High
The P2440 code means the vehicle's onboard diagnostic system has detected: EVAP Leak Detection Pump Circuit High. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $100 - $400 (parts and labor)
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Common Symptoms
- Check Engine Light on
- EVAP leak test fails
- Gas cap warning light on
- Slight fuel odor
- Failed emissions test
Probable Causes (Ranked by Likelihood)
- Open circuit in LDP circuit Very High
- Corroded LDP connector High
- Damaged LDP wiring Moderate
- ECM LDP driver fault Low
Step-by-Step Diagnostic Procedure
-
Test EVAP leak detection pump operation with scan tool
-
Inspect LDP wiring and connector
-
Check LDP pump for mechanical operation
-
Verify ECM command to LDP
Common Fixes by Vehicle
What techs usually find when diagnosing P2440 on specific vehicles — tap your vehicle for the fix and the exact part:
2005-2012 Ford Mustang GT 4.6L 3V moderate DIY
P2440 = Secondary Air Injection Switching Valve Stuck Open Bank 1. On 4.6L Mustangs, the SAI valves are on each cylinder head. The valve diaphragm tears and stays open, pulling exhaust gas backward through the system. Replace with Motorcraft CX-2184. Also check the vacuum line to the valve -- cracked lines mimic the failure.
Labor: 1 hour2007-2014 Chevy Silverado/Tahoe 5.3L/6.0L moderate DIY
GM 5.3L/6.0L P2440 = bank 1 SAI switching valve stuck open. Water ingestion through the SAI intake (above the driver-side fender) corrodes the valve and pump. Replace the SAI valve and check the pump shaft for rust. GM TSB 14-06-04-002 covers the common failure. Relocate the intake higher as part of the fix.
Labor: 1-2 hours2004-2010 BMW X5/5-Series 4.4L/4.8L V8 moderate DIY
BMW V8 P2440 = bank 1 SAI valve stuck open. The SAI valves (one per bank) bolt to the cylinder head and are vacuum-controlled. Vacuum diaphragm failure is the root cause. Replace with OE Pierburg. While valves are out, check for carbon deposits in the head passage and clean.
Labor: 2-3 hoursFrequently Asked Questions
What does P2440 mean?
P2440 indicates: EVAP Leak Detection Pump Circuit High. The ECM detected an issue that needs diagnosis and repair.
Is P2440 urgent?
EVAP codes should be repaired but are not usually urgent unless you have an upcoming emissions test.
What should I check first?
Start with a visual inspection of the sensor wiring and connector. Use a scan tool to read live data. For DPF codes, check soot loading level. For EVAP codes, check the gas cap first.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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