P2402 EVAP leak detection pump control circuit high

Evaporative Emission System Leak Detection Pump Control Circuit High

Monitor

KBB says drivability problems are uncommon and you can keep driving, but the EVAP leak check cannot run and the car will fail an emissions check, so do not ignore it.

Source: how we rate severity

P2402 in short

P2402 means the engine computer sees a higher voltage than expected on the control circuit of the EVAP leak detection pump, so it cannot run its fuel vapor leak test. A failed pump module is the usual cause, then wiring or water in the pump. It rarely affects driving, but the car will fail an emissions check.

Cars with a leak detection pump test the fuel tank and vapor system for leaks themselves, usually after the engine is switched off. The pump, often built into a module on or near the charcoal canister, pushes or pulls air through the system while a sensor watches the pressure.

P2402 sets when the computer sees the pump's control circuit sitting higher than it should, for example an open circuit or a pump that is not responding to its command. Without a working pump the leak test cannot run.

Different makers build this pump differently. Toyota's canister pump module includes the pump, a vent valve and a pressure sensor, and Toyota's own description of P2402 is the pump stuck on. Land Rover and Jaguar use a DMTL pump that can fail internally or get water and ice in its filter.

Most likely causes

  1. Failed leak detection pump or canister pump module

    Supported by vehicle data
    Why it ranks here
    KBB names a faulty pump module as the most likely cause. Land Rover says an internal DMTL pump failure is the likely cause on 2006–2014 Range Rover Sport and LR4 when other checks find nothing, and Toyota repair text lists the canister pump module first.
    What would change this
    Rises if the pump does not run or its voltage is wrong during a scan tool active test with good wiring. Falls if the pump runs and the circuit reads correctly.

  2. Water or ice in the pump or its filter

    Supported by vehicle data
    Why it ranks here
    Jaguar links P2402 and other EVAP codes on the 2010–2015 XJ to water or ice from tire spray trapped in the DMTL pump filter.
    What would change this
    Rises if the code follows wet or freezing weather, or water is found at the pump or filter. Falls if the pump and filter are dry.

  3. Damaged wiring or corroded connector between the pump and the engine computer

    Common general cause
    Why it ranks here
    KBB and Toyota's trouble-area list both include the harness and connectors. The pump sits under the car where road spray reaches it.
    What would change this
    Rises if the connector is corroded or a wire is open. Falls if the circuit tests good end to end.

  4. Engine computer or its software

    Possible — needs testing
    Why it ranks here
    KBB and Toyota's trouble-area list include the engine computer. Mazda reprogrammed the 2004 RX-8 computer under a special program covering several codes including P2402.
    What would change this
    Rises if a dealer finds a newer calibration or the computer does not drive the circuit with good wiring. Falls once the pump and wiring are proven good and the software is current.
    How to test the engine control module (ecm / pcm)

What to test first

Start at step 1. Each result tells you what it means and where to go next.

  1. Read all codes and freeze-frame data, and note whether other EVAP pump codes (P2401, P2419, P043E, P043F) or leak codes are stored too.

    Low riskTool: OBD-II scan tool

    • IfSeveral pump and EVAP codes set together after wet or icy weather

      It meansWater in the pump or its filter is likely.

      Go to step 3

    • IfP2402 is stored alone

      It meansCheck bulletins, then the pump circuit.

      Go to step 2

  2. Ask a dealer to check the VIN for engine computer updates and EVAP pump bulletins.

    Low riskTool: VIN lookup at a dealer

  3. With the engine off, find the leak detection pump (usually near the charcoal canister or fuel tank) and check its connector, wiring and filter for water, corrosion or damage.

    Use cautionTool: visual inspection, flashlight

    Warning:Only work under the car on level ground with the car properly supported on stands, never on a jack alone, and keep sparks and flames away from the fuel tank area.

  4. Have a shop run the leak detection pump with a scan tool active test and measure the voltage on the pump wires while it runs.

    Best left to a shopTool: scan tool with active tests, multimeter

    Warning:The pump sits near the fuel tank and canister; a shop should do this with the car safely supported and no sparks or flames nearby.

Symptoms

  • Check engine light on
  • EVAP readiness monitor not complete; fails an emissions check
  • Often sets with other EVAP pump codes after wet or icy driving

How to fix

  1. Ask a dealer whether an engine computer update or EVAP pump bulletin applies to your VIN.

  2. If you can see the pump connector safely, check that it is fully plugged in and free of water and corrosion.

Parts and cost context

  • EVAP charcoal canister:On some models the leak detection pump is part of a module on the charcoal canister and is sold as an assembly. Labor varies; get a quote.

Labor varies by vehicle and shop; get a quote before you approve a repair.

Compare used part prices on PartPriceGuide

On your vehicle

Land Rover

  • 2006–2013 · Range Rover Sport

    Supported by vehicle data

    Also 2010–2014 LR4: internal DMTL pump failure when other checks find nothing. Bulletin status not verified.

  • SSM71298Status unverified

    MIL with DMTL pump codes including P2402

    2006–2014range-rover-sport, lr4 · issued · NHTSA 10101264

    If no fault is found after the latest diagnostics, the DMTL pump may have failed internally.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Toyota

  • 2005 · Sequoia

    Supported by vehicle data

    Toyota bulletin for P2402 with other canister pump module codes. Toyota describes P2402 as the leak detection pump stuck on. Bulletin status not verified.

  • 01505Status unverified

    MIL on with P043E, P043F, P2401, P2402 and P2419

    2005sequoia · issued · NHTSA 10015869

    The flat-file summary gives no cause.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Mazda

  • 2004 · RX-8

    Supported by vehicle data

    Engine computer reprogramming under a special program covering P2402 and other codes. Bulletin status not verified.

  • 0102204Status unverified

    Special program MSP04: P2107, P2108, P2402 or P0420, PCM reflash

    2004rx-8 · issued · NHTSA 10008057

    Reprogram the engine computer.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • P0442EVAP system small leak detected

    Shares causes Supported by vehicle data

    Jaguar lists P0442 with P2402 on the 2010–2015 XJ, both from water or ice in the DMTL pump filter.

  • P0496EVAP purge flow when purge should be off

    Shares causes Supported by vehicle data

    The same Jaguar bulletin lists P0496 with P2402 from water or ice in the DMTL pump filter.

All EVAP (evaporative emissions) codes

P2402 questions

Is P2402 a fuel leak?

No. It means the pump the car uses to test for vapor leaks has a circuit problem, so the leak test cannot run. It does not by itself mean fuel is leaking.

Sources and review

  1. P2402 code: EVAP leak detection pump control circuit high — Kelley Blue Book (KBB Service Advisor, reviewed by Gary Hardesty)
  2. MIL with P2401, P2402, P2404, P2405, P2406, P240A–P240C, P2450 or P2451: internal DMTL pump failure (Land Rover SSM71298) — Jaguar Land Rover North America / NHTSA ,
  3. Toyota P2401 / P2402 leak detection pump stuck OFF / ON (forum post quoting Toyota repair information) — TacomaWorld
  4. MIL with EVAP and DMTL codes including P2402: water or ice in the DMTL pump filter (Jaguar JTB00436NAS1/NAS2) — Jaguar Land Rover North America / NHTSA ,
  5. Mazda special program MSP04: no start, lack of power, P2107, P2108, P2402 or P0420, PCM reflash (bulletin 0102204) — Mazda North American Operations / NHTSA ,
  6. MIL on with P043E, P043F, P2401, P2402 and P2419 (Toyota bulletin 01505) — Toyota Motor Sales / NHTSA ,
  7. Final Regulation Order: 13 CCR §1968.2, Malfunction and Diagnostic System Requirements (OBD II), 2004 and subsequent model-year passenger cars, light-duty trucks and medium-duty vehicles (2015 amendments) — California Air Resources Board
Last reviewed
Written by
Saurabh K.
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