P2438 low

EVAP Leak Detection Pump Circuit/Open

The P2438 code means the vehicle's onboard diagnostic system has detected: EVAP Leak Detection Pump Circuit/Open. This is a low severity code.

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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)

Failed EVAP leak detection pump 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

Frequently Asked Questions

What does P2438 mean?

P2438 indicates: EVAP Leak Detection Pump Circuit/Open. The ECM detected an issue that needs diagnosis and repair.

Is P2438 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.