OBD-II Code · Emissions
P2402
EVAP Leak Detection Pump Control Circuit High
Severity
low
Lowest on our scale. Fix it when convenient.
Can you drive it
Only if running normally
A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety.
Indicative cost (USD)
$150–$400
Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
EVAP leak detection pump high voltage.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then work the likely-causes list in the order shown.
That order is what a shop checks first for this code — wiring and connections before the component they run to, because a connector costs nothing to inspect and is a common answer.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Check engine light
Likely causes
- Failed pumpMost common
- Wiring
Read the full diagnostic procedureP2402 means the ECM is seeing the EVAP Leak Detection Pump control circuit stuck high — voltage on the control pin is sitting at battery voltage when…
P2402 means the ECM is seeing the EVAP Leak Detection Pump control circuit stuck high — voltage on the control pin is sitting at battery voltage when the driver should be pulling it down to ground for activation, indicating an open low-side driver, an open control wire between the ECM and the pump, or an internally-open solenoid that won't sink current. With the pump connector unplugged you should read battery voltage on the supply pin and the control pin should float (high-impedance) until the ECM commands the pump on; during a commanded scan-tool activation the control pin should drop to under 1.0V while the ECM sinks the 0.3-0.8A of solenoid drive current.
Cheapest-first ladder
- unplug the connector and ohm-check the solenoid coil (30-80 ohms = healthy, infinite = open winding), back-probe the control pin during activation and look for the expected voltage drop, then continuity-check the control wire from the ECM connector to the pump connector (more than 5 ohms end-to-end = harness fault).
- Expensive misdiagnosis caveat: VW/Audi/Chrysler LDP is mounted in a notorious water-collection point above the rear axle — corrosion at the connector is the #1 root cause; replace the pigtail before replacing the pump, because an oxidized control-pin contact reads as a high-circuit fault even though the pump itself is fine.
Vehicle-specific patterns1998-2009 VW/Audi (Jetta, Passat, Golf, A4, A6) throws P2402 from oxidized pin contacts inside the rear-axle LDP connector — the connector terminals…
- 1998-2009VW/Audi (Jetta, Passat, Golf, A4, A6) throws P2402 from oxidized pin contacts inside the rear-axle LDP connector — the connector terminals look mated but the contact resistance climbs past 50 ohms and the ECM sees the circuit as open.
- 1998-2008Chrysler/Jeep/Dodge (Sebring, Wrangler, Grand Cherokee) NVLD/LDP combination units commonly throw P2402 from an internally-open solenoid coil that breaks at the lead-out weld inside the housing.
- 1996-2005Mercedes-Benz (W202, W203, W211) throws P2402 from a failed EVAP relay in the rear SAM module that no longer supplies battery voltage to the pump on key-off. Common LDP repair pattern: replace pump + harness pigtail together; standalone pump replacement leaves the same root cause.
Estimated repair$180 to $700.
Look up another code
P2402 — frequently asked
What does a P2402 code mean?
EVAP leak detection pump high voltage.
What causes a P2402 code?
Common causes: Failed pump; Wiring.
What are the symptoms of a P2402 code?
Typical symptoms: Check engine light.
Is it safe to drive with a P2402 code?
Only if running normally. A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety. Estimated repair: $150-$400.
How do I diagnose a P2402 code?
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed. 1. Note every code that is set, not just this one. 2. Read the freeze frame — the conditions the fault was recorded under. 3. Confirm the fault is current rather than history. 4. Then work the likely-causes list in the order shown.
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