P2401 on 2010-2015 Jaguar XJ: EVAP Pump Circuit Low - Water Intrusion, Causes, and Fixes

What's Unique About the 2010-2015 Jaguar XJ

The 2010-2015 Jaguar XJ (X351 generation) is uniquely susceptible to this code due to a specific design vulnerability. The DMTL pump and its filter are located in an area exposed to spray from the road tires. Jaguar issued a Technical Service Bulletin (JTB00436NAS2) acknowledging that water and ice can become trapped in the pump's filter, leading to corrosion and electrical failure of the pump and its connector. This makes water intrusion the primary suspect for P2401 on these specific vehicles, a detail not found in generic repair guides.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Symptoms You May Notice

• Check Engine Light is illuminated
• Failure to pass an emissions test.
• A faint fuel odor may be noticeable near the rear of the vehicle in some cases.

Most Likely Causes

1. Water/Ice Intrusion into DMTL Pump and Connector 🔴 High Probability → Shop Evaporative Emissions System Leak Detection Pump As per Jaguar TSB #JTB00436NAS2, road spray from the tires gets into the DMTL pump filter, causing corrosion, freezing, and electrical failure. The connector pins can also burn out due to the short circuit.
   How to confirm: Visually inspect the DMTL pump and its connector, located near the evaporative canister in the rear wheel well area. Look for signs of moisture, white or green corrosion, or burnt/melted plastic on the connector. A forum user documented this exact failure with photos showing a burnt connector.
   Typical fix: Follow the TSB procedure: Replace the evaporative emission canister (C2D40532), fuel tank filler pipe (C2D49256), and install the protective foam shield (C2D49253). The electrical connector may also need to be repaired or replaced if damaged, which can be difficult as it's part of the main body harness.
   Est. part cost: $250-$450 for the canister, filler pipe, and foam kit.
2. Failed EVAP Leak Detection Pump (DMTL Pump) 🟡 Medium Probability → Shop Vapor Canister The pump can fail internally from normal wear, but on this platform, it is almost always a direct result of the water intrusion issue causing an internal short or seizure.
   How to confirm: After confirming power and ground are present at the pump's connector, use a capable scan tool to command the pump 'on'. If it does not activate (no click or hum), and the wiring is good, the pump has failed. You can also bench test it with a 12V source.
   Typical fix: Replace the DMTL pump. On this vehicle, it is attached to the evaporative canister, which is typically replaced as an assembly per the TSB.
   Est. part cost: $150-$300 for the pump/canister assembly.
3. Damaged Wiring or Connector ⚪ Low Probability The wiring harness in the rear wheel well is exposed to the elements. The water intrusion that damages the pump can also corrode the connector pins and wiring, leading to a 'circuit low' condition.
   How to confirm: Perform a continuity test on the wires between the ECM and the DMTL pump connector. Check the connector pins for corrosion, damage, or being burnt, which is a known issue. A user on JaguarForums noted their connector was burnt and had to be replaced.
   Typical fix: Repair the broken or shorted wire. If the connector is corroded or burnt, it may need to be replaced. Jaguar does not sell the connector separately, so sourcing one from a junkyard or repairing the pins may be necessary.
   Est. part cost: $10-$75 for wiring repair supplies or a used connector pigtail.

Rare But Worth Checking

• Faulty Powertrain Control Module (PCM): → Shop Engine Control Module (ECM) This is extremely rare and should only be considered after all other possibilities, including the pump, connector, and the entire circuit, have been thoroughly tested and ruled out. A failed PCM driver can cause a persistent circuit low code.

Diagnosis Steps

1. Read the trouble codes with an OBD-II scanner. Note if P2401 is present with other related codes like P2402 or P240C.
2. Obtain and review Jaguar's Technical Service Bulletin JTB00436NAS2. This document is critical for understanding the specific failure mode on this vehicle.
3. Raise and safely support the rear of the vehicle. Remove the rear driver's side wheel and wheel arch liner to gain access.
4. Locate the DMTL pump and evaporative canister, positioned forward of the spare wheel well.
5. Visually inspect the pump, its electrical connector, and surrounding wiring. Pay close attention to signs of water damage, corrosion, or a burnt/melted connector, as documented by owners.
6. Using a multimeter, disconnect the pump and check for correct voltage and ground at the connector with the key on. A reading below 9V indicates a wiring or PCM issue.
7. If power and ground are present, use a high-level scan tool to command the DMTL pump to activate. Listen for a click or hum. If the pump is silent, it has likely failed.
8. If the pump does not activate and the connector is visibly damaged (burnt/corroded), both the pump and connector repair are necessary.
9. If the TSB applies, perform the complete recommended repair: replace the evaporative canister (C2D40532), fuel tank filler pipe (C2D49256), and add the protective foam shield (C2D49253).
10. After repairs, clear the DTCs using a scan tool.

Parts You'll Likely Need

• Evaporative Emission Canister (OEM #C2D40532) — Per TSB JTB00436NAS2, this part is replaced as part of the official fix. The DMTL pump is attached to it. This part number supersedes C2C39518, C2C35068, and C2C26576.
  Trusted brands: Jaguar (OEM)
  OEM price range: $290-$360
• Protective Foam Shield (OEM #C2D49253) — This is a critical part called for in TSB JTB00436NAS2 to prevent a recurrence of the water damage by shielding the new components. It comes with a zip tie for installation.
  Trusted brands: Jaguar (OEM)
  OEM price range: $20-$50
• Fuel Tank Filler Pipe (OEM #C2D49256) — Also listed as a required replacement part in the TSB and confirmed by an owner who completed the repair. The TSB from 2015-08-07 lists part number C2D30506.
  Trusted brands: Jaguar (OEM)
  OEM price range: $80-$120

Related Codes That Often Appear With This One

• P2402 — This code for 'Pump Control Circuit High' is the counterpart to P2401 and points to the same set of electrical components. A user on JaguarForums had P2401, P2402, and P240C simultaneously from the same burnt connector issue.
• P240C — Listed in TSB JTB00436NAS2 as a code that can be triggered by the same water/ice intrusion issue in the DMTL pump.
• P043E — All are listed in TSB JTB00436NAS2 as codes that can be triggered by the same water/ice intrusion issue in the DMTL pump.
• P0442 — All are listed in TSB JTB00436NAS2 as codes that can be triggered by the same water/ice intrusion issue in the DMTL pump.
• P240A — Listed in TSB JTB00436NAS2 as a code that can be triggered by the same water/ice intrusion issue in the DMTL pump.

Technical Service Bulletins (TSBs) & Recalls

• JTB00436NAS2: Details the issue of water/ice ingress into the DMTL pump from road tire spray. It lists affected VINs (V00001-V90865), a wide range of potential DTCs (including P2401), and provides a specific repair procedure involving replacing the canister, filler pipe, and adding the protective foam shield.

Platform-Specific Known Issues

• A known design flaw allows road spray to enter the DMTL pump filter, causing water/ice to become trapped. This leads to corrosion and electrical failure of the pump and its connector, triggering P2401 and other related EVAP codes. Jaguar addressed this with TSB JTB00436NAS2.
• A real-world repair documented on JaguarForums confirmed the TSB is the correct path. The user replaced the canister (C2D40532), filler pipe (C2D49256), and foam shield (C2D49253) to fix codes P2401, P2402, and P240C, noting it took five hours of labor.

Mechanic-Grade Diagnostic Values

• DMTL pump reference voltage — expected: ~12V (Battery Voltage) with ignition ON, engine OFF.. Failure: A reading below 9V indicates a problem in the circuit or PCM.
• DMTL pump circuit wiring continuity — expected: < 0.2 Ω. Failure: Resistance greater than 0.2 Ω indicates high resistance in the wiring.
• DMTL pump ground circuit resistance — expected: < 5.0 Ω. Failure: Values above 5 Ω indicate a poor ground path that must be repaired.

Scan Tool Commands That Help

• Jaguar SDD (Symptom Driven Diagnostics): Evaporative System Diagnostic Test — This is the official Jaguar diagnostic routine to test the entire EVAP system, including the DMTL pump. It can differentiate between a leak failure and an electrical/hardware failure, which is critical for a circuit code like P2401.
• Jaguar SDD (Symptom Driven Diagnostics): Vehicle Reset — After performing a repair, a 'vehicle reset' should be performed to reset the control modules.

Wiring & Ground Locations

• DMTL Pump Connector — Attached to the DMTL pump on the evaporative canister, located in the rear driver's side wheel well area, forward of the spare wheel well.. This connector is the primary failure point due to water intrusion and corrosion, as per TSB JTB00436NAS2. It is known to burn or melt, causing the P2401 circuit low code.
• Ground Points (General) — Jaguar uses a specific naming convention (e.g., G1D121CS, G2D116AL). The exact ground point for the DMTL pump circuit would need to be looked up in the vehicle's specific electrical guide.. A poor ground connection can cause a voltage drop and trigger a circuit low code. Generic diagnostic advice suggests checking for ground resistance above 5 Ω.

OEM Part Supersession History

• C2C26576, C2C35068, C2C39518 → C2D40532 — Part has been updated by the manufacturer. The TSB for the water intrusion issue specifies using the latest part number.
  Heads up: Using an older, superseded part number may re-introduce the original design vulnerability. It is critical to use C2D40532 along with the other parts in the TSB.

Model Year Variations Within This Range

• 2010-Onwards: TSB JTB00436NAS2 applies to VINs V00001 and onwards, covering the entire production range of the X351 XJ that is affected by the water intrusion issue.