P2438 low
EVAP Leak Detection Pump Circuit/Open
Can I Drive?
Yes, But Fix Soon
DIY Difficulty
moderate
Estimated Cost
$100 - $400 (parts and labor)
What does P2438 mean?
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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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
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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.