Evaporative Emission System Leak Detection Pump Sense Circuit Open
The P2403 code means the vehicle's onboard diagnostic system has detected: Evaporative Emission System Leak Detection Pump Sense Circuit Open. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $100 - $450 (parts and labor)
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What Are the Symptoms of P2403?
- Check Engine Light illuminated
- Failed emissions test
- No drivability symptoms
- EVAP readiness monitor incomplete
- Diagnostic trouble codes related to EVAP leak testing
What Causes P2403? (Most Likely First)
- Failed pressure sense circuit in leak detection pump Very High
- Broken sense wire from pump to ECM High
- Corroded connector at pump sense circuit Moderate
- ECM sense input circuit fault Low
Can I Still Drive with P2403?
Yes, but fix soon. P2403 is rated low severity. It is not an immediate stop-driving fault, but it will not clear itself — book the repair rather than ignoring the light.
Frequently Asked Questions
Can I drive with code P2403?
Yes, safe to drive. This code only affects the EVAP leak testing capability and has no impact on engine operation.
What causes P2403?
Usually a failed pressure sensor inside the leak detection pump or a broken sense wire. The pump assembly typically needs replacement.
Is P2403 expensive to fix?
Typically $100 to $450. The leak detection pump assembly is the most common repair. Check wiring and connectors first.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P2403?
-
Check the leak detection pump connector for all pins making contact
-
Measure voltage on the sense circuit wire with key on
-
Inspect the sense wire from the pump to the ECM for breaks
-
Check connector corrosion at the pump and ECM ends
-
Test the pump pressure sensor output with a scan tool
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
Which Vehicles Commonly Get P2403?
- 2012-2020 Jeep Grand Cherokee
- 2013-2021 Ram 1500
- 2011-2019 Dodge Durango
- 2014-2022 Chrysler 300
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