P2402 on 2010-2017 Jaguar XJ: EVAP Pump Circuit High Causes and Fixes

What's Unique About the 2010-2017 Jaguar XJ

The 2010-2017 Jaguar XJ (X351 generation) is uniquely prone to this code due to a design vulnerability. The EVAP leak detection pump and its components are located behind the rear wheel arch liner, where they are exposed to water, salt, and debris spray from the tires. Jaguar acknowledged this issue in Technical Service Bulletin (TSB) JTB00436NAS2, stating that water and ice can get into the system, causing corrosion and electrical failures that trigger P2402 and a host of related EVAP codes. The repair is notably difficult and expensive because the pump/canister assembly is mounted above the rear sub-frame, which often must be lowered or dropped for access.

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 on
• Failure to pass an emissions test
• In some cases, difficulty refueling the car (gas pump nozzle clicks off repeatedly).
• A blown fuse for the EVAP system circuit may be found in some instances.

Most Likely Causes

1. Water/Ice Intrusion Damaging the Leak Detection (DMTL) Pump 🔴 High Probability → Shop Evaporative Emissions System Leak Detection Pump As documented in TSB JTB00436NAS2, the pump is located in an area vulnerable to road spray from the rear wheels, leading to corrosion and electrical shorts. The water becomes trapped in the pump's filter, leading to internal failure and connector damage.
   How to confirm: Visually inspect the DMTL pump and its electrical connector, located behind the driver's side rear wheel arch liner, mounted to the charcoal canister above the sub-frame. Look for signs of water intrusion, green or white corrosion, or melted/burnt plastic on the connector. This is the primary failure point.
   Typical fix: The official TSB repair involves replacing the evaporative canister (which includes the pump), the fuel tank filler pipe, and adding a new protective foam shield (Part No. C2D49253) to prevent recurrence. Some owners have had success simply replacing the pump and cleaning the connector, but adding the foam block is critical to prevent a repeat failure.
   Est. part cost: $250-$500
2. Damaged Wiring or Corroded Connector 🟡 Medium Probability The same water intrusion that damages the pump also attacks the electrical connector and wiring harness, causing a short to power or high resistance that triggers the P2402 code. Forum users have reported the connector pins being completely corroded or burnt.
   How to confirm: After unplugging the pump, check the connector terminals for corrosion or burn marks. Perform a continuity test on the wires running from the ECM to the pump connector to check for shorts to power. A 'circuit high' code often means one of the pins is shorted to a power source.
   Typical fix: Clean the connector terminals with electrical contact cleaner. If the connector is melted or severely damaged, it needs to be replaced. Jaguar does not sell the pigtail separately, so sourcing a connector from a BMW (which uses the same Bosch pump) or a junkyard may be necessary. Applying dielectric grease during reassembly is crucial to prevent future corrosion.
   Est. part cost: $20-$75

Rare But Worth Checking

• Faulty Powertrain Control Module (PCM): → Shop Engine Control Module (ECM) This is very rare. Before suspecting the PCM, all other possibilities, especially the pump and wiring, should be exhaustively ruled out. A faulty driver circuit within the PCM can cause a 'circuit high' reading.

Diagnosis Steps

1. Read all diagnostic trouble codes with an OBD-II scanner. Note any other EVAP codes, as they are likely related per TSB JTB00436NAS2.
2. Safely lift and support the rear of the vehicle. A vehicle lift is highly recommended.
3. Remove the rear wheel (driver's side for LHD models) and the plastic wheel arch liner to access the EVAP components. This may require removing several 8mm or 10mm bolts and plastic clips.
4. Locate the charcoal canister and the attached DMTL pump. It is mounted high above the rear sub-frame, near the fuel filler neck area. Access is very tight.
5. Disconnect the electrical connector from the pump. Carefully inspect the pump's pins and the connector's terminals for corrosion (green/white powder), moisture, or burn marks. This is the most common failure point.
6. If corrosion is present, the pump is almost certainly faulty and the connector may need repair or replacement.
7. If no visible damage is found, use a multimeter to check for voltage at the connector. A 'circuit high' code suggests you may find a voltage that is shorted to a power source.
8. If wiring seems okay, the pump itself has likely failed internally. A professional scan tool can command the pump to activate to test its function, but given the difficulty of access, this is often skipped in favor of replacement based on the known TSB.
9. If the TSB repair is being followed, prepare to lower the rear sub-frame 🎬 Watch: This walkthrough shows the charcoal canister replacement process. to gain access to replace the canister/pump assembly, the fuel filler neck, and install the new protective foam piece.

Parts You'll Likely Need

• Evaporative Emission Canister / DMTL Pump Assembly (OEM #C2D40532) — This is the primary part that fails due to water intrusion. The DMTL pump is integrated with the canister. This part number is specified in the updated TSB repair.
  Trusted brands: Jaguar (OEM)
  OEM price range: $290-$400
• Protective Foam Shield (OEM #C2D49253) — This is a critical part of the official TSB fix. It's a specially designed foam block that shields the new canister and pump from road spray to prevent the problem from happening again.
  Trusted brands: Jaguar (OEM)
  OEM price range: $20-$50
• Fuel Tank Filler Pipe (OEM #C2D49256) — Jaguar's TSB also calls for replacing the fuel filler pipe as part of the complete repair procedure, possibly due to related vacuum issues or to ensure full system integrity. One forum user noted the TSB suggests it can collapse under vacuum.
  Trusted brands: Jaguar (OEM)
  OEM price range: $80-$120
• DMTL Pump (Bosch) (OEM #Bosch 0261222018 / WTR500030 (Land Rover)) — For those not replacing the entire canister, the pump itself is a Bosch unit shared with other brands like BMW and Land Rover. This may be a more cost-effective option if the canister itself is not cracked, but requires separating the old pump from the canister.
  Trusted brands: Bosch
  OEM price range: $75-$120

Related Codes That Often Appear With This One

• P2401 — This is the code for 'Pump Control Circuit Low'. Both P2401 and P2402 are listed in the same Jaguar TSB and point to the same water intrusion issue causing electrical faults in the DMTL pump.
• P043E — Also listed in TSB JTB00436NAS2, this code relates to the EVAP system leak detection reference orifice and is triggered by the same water/ice contamination problem.
• P240C — This code for the pump heater control circuit is also mentioned in the TSB and forum discussions as appearing alongside P2402 due to the same component failure.
• P2406 — This code for 'Pump Control Circuit Range/Performance' is also listed in the TSB and is caused by the same water ingress issue affecting the pump's operation.

Technical Service Bulletins (TSBs) & Recalls

• JTB00436NAS1
• JTB00436NAS2

Platform-Specific Known Issues

• Jaguar Technical Service Bulletin JTB00436NAS2 explicitly details the cause of P2402 and other EVAP codes as water/ice spray from the road contaminating the DMTL pump filter. The bulletin provides a detailed repair procedure that involves replacing multiple components and adding a protective foam shield to prevent recurrence.
• The labor is the most significant part of this repair. Multiple owners on JaguarForums.com confirm that dropping the rear sub-frame is necessary, making it a 5+ hour job. One owner reported a dealer bill of $2600.

Mechanic-Grade Diagnostic Values

• DMTL Pump Sense Line Voltage — expected: Approximately 5V DC with key on, engine off.. Failure: A reading significantly higher than 5V, or a short to battery voltage, would align with a 'Circuit High' fault.
• DMTL Pump Motor Winding Resistance — expected: A very low resistance, likely in the 1-4 Ohm range.. Failure: A very high resistance reading (e.g., 300 Ohms) indicates a failed or failing pump motor.

Scan Tool Commands That Help

• Jaguar SDD (Symptom Driven Diagnostics): Evaporative System Diagnostic Test — This function should be used to command the DMTL pump to activate and to have the system differentiate between an electrical/hardware fault (like P2402) and a physical system leak (like P0442). It is the definitive software-based test before physically accessing the components.

Wiring & Ground Locations

• DMTL Pump Connector — Attached to the DMTL pump, which is mounted on the charcoal canister located high above the rear sub-frame, behind the driver's side rear wheel arch liner.. This is the single most common failure point. Water intrusion from road spray directly attacks this connector, causing corrosion and short circuits that trigger P2402.
• G4D171AL / G4D171AR — These are ground points located in the rear left-hand quarter of the vehicle, near the EVAP system components.. A corroded or loose ground in this area can cause erratic voltage and current in the DMTL pump circuit, potentially leading to a 'Circuit High' code.
• C32-T / C32-M — These are main harness connectors located in the rear left-hand quarter panel area.. If the DMTL connector itself is clean, a fault could exist further up the harness. These connectors are the next logical place to check for corrosion or pin damage when tracing the circuit back to the PCM.

Real Owner Repair Stories

• JaguarForums.com user 'wombat' (2012 Jaguar XJ) — Check Engine Light with codes P2402 & P2406.
  ❌ Tried (didn't work) Initial hope that the code was a temporary glitch.
  ✅ What actually fixed it The full TSB procedure was required. The carbon canister, EVAP pump, and fuel filler neck were replaced. The user noted that the electrical connections were fine, but the canister itself was extremely corroded. The repair required dropping the entire rear sub-frame and took the shop 6 days.
• JaguarForums.com user 'SovietKitsch' (2011 Jaguar XJ, ~80,000 miles) — Check Engine Light with code P2402.
  ✅ What actually fixed it The canister itself was found to be cracked. The final repair involved replacing the canister with a used unit and installing a new pump. The repair required dropping the rear end.
• JaguarForums.com user 'wombat' (reporting another user's experience) (2012 Jaguar XJ 5.0 S/C) — Check Engine Light with codes P240c, P2402, P2406, and difficulty refueling (gas nozzle clicks off).
  ✅ What actually fixed it The main dealer performed the full TSB repair, replacing the carbon canister/pump unit and the fuel filler tube. The dealer confirmed the rear sub-frame had to be dropped for access, resulting in a total cost of just over $2600.

"I Checked Everything" — The Actual Cause

• A P2402 code indicates an electrical circuit fault ('Circuit High'), not a physical leak in the EVAP system. A Jaguar diagnostic bulletin explicitly advises technicians NOT to perform a smoke test or other leakage tests when an electrical, hardware, or module fault is detected by the SDD scan tool. A smoke test on a vehicle with only a P2402 code would come back clean, as there is no leak to be found, misleading the technician. The problem lies within the wiring, connector, or the pump's internal electronics, not the hoses or seals.

OEM Part Supersession History

• C2C26576, C2C35068, C2C39518 → C2D40532 — Component revision and consolidation for the Evaporative Emission Canister assembly.