P2450 on 2010-2014 Land Rover LR4: EVAP Switching Valve and DMTL Pump Guide

What's Unique About the 2010-2014 Land Rover LR4

While P2450 is a generic code, on the LR4 and its platform mates, it is frequently tied to the Bosch-made DMTL pump (Land Rover P/N WTR500030). A key document, Technical Service Bulletin (TSB) SSM71298, notes that if no obvious wiring or component fault is found after following the standard diagnostic path in TOPIx, the cause may be an internal failure of the diagnostic module itself, which is an unusual and specific point of failure for this platform.

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.
• Possible faint fuel smell near the rear of the vehicle, especially after refueling.
• Failure to pass a state emissions inspection.
• Audible buzzing or pump running noise from the rear passenger side of the vehicle for an extended period (2-3 minutes) after the engine is shut off.

Most Likely Causes

1. Failed EVAP Leak Detection (DMTL) Pump 🔴 High Probability The Bosch DMTL pump is a known high-failure item across multiple Land Rover models. Land Rover's own diagnostic charts often lead directly to replacing the pump for this code.
   How to confirm: After checking wiring for power and ground, the pump is the most likely culprit. A specialized scan tool can command the pump to activate (bi-directional control), but if it fails to respond despite having power, it has failed. Some owners notice the pump running continuously for several minutes after shutdown, which can be a sign of it failing to build adequate pressure. A definitive failure is when it makes no noise at all when commanded on.
   Typical fix: Replace the DMTL pump. The OEM part is made by Bosch and is widely available.
   Est. part cost: $150 - $250
2. Damaged Wiring or Connectors 🟡 Medium Probability The pump is located under the vehicle near the rear passenger wheel, exposing its wiring to road debris, moisture, and corrosion. The harness can chafe or the connector pins can corrode, leading to an open or short circuit.
   How to confirm: Visually inspect the wiring harness leading to the DMTL pump for any breaks, corrosion, or loose connections. Use a multimeter to check for 12V power and a good ground at the connector with the key on. Trace the harness from the pump towards the front of the vehicle, paying attention to any areas where it might rub against the frame or suspension components.
   Typical fix: Repair the damaged section of the wiring harness or clean/replace the connector. In some cases, a new pigtail connector may need to be spliced in.
   Est. part cost: $10 - $60
3. Internal Diagnostic Module Fault ⚪ Low Probability A specific Land Rover TSB (SSM71298) states that if no other fault is found after following diagnostic procedures, the cause may be an internal issue within the diagnostic module, which is likely the Engine Control Module (ECM/PCM).
   How to confirm: This is a diagnosis of exclusion. If the DMTL pump, wiring, and fuses are all confirmed to be good, the module itself is suspect. This requires a dealer or specialist with advanced diagnostic tools like SDD or Pathfinder to confirm, as it may involve checking for software updates or module replacement.
   Typical fix: Reprogramming or replacement of the Powertrain Control Module (PCM).
   Est. part cost: $200 - $1000+
4. Blown Fuse ⚪ Low Probability An electrical short in the pump or wiring can cause the associated fuse to blow.
   How to confirm: Check the fuse boxes for any blown fuses. The primary fuse box is located behind the glove compartment. The engine compartment fuse box may also contain relevant fuses. Check for 5-amp fuses labeled for the EVAP system, such as FUSE 19P or FUSE 27E in the Central Junction Box.
   Typical fix: Replace the blown fuse. If the fuse blows again immediately, it indicates a persistent short circuit in the wiring or the DMTL pump itself that must be found and repaired.
   Est. part cost: $1 - $10

Rare But Worth Checking

• Cracked Fuel Tank Flange: A known issue covered by NHTSA Safety Recall N623 can cause EVAP leak codes. While this typically sets small leak codes (P0442, P0456) rather than a circuit code like P2450, the symptoms can be similar. It's crucial to check if this recall applies to your VIN and has been completed, as a large leak could potentially cause the DMTL pump to run excessively and trigger a performance fault.

Diagnosis Steps

1. Read the code with an OBD-II scanner and confirm it is P2450. Note any other codes present.
2. Check the fuse box behind the glove compartment for any blown fuses related to the emissions or EVAP system, specifically 5A fuses like F19P or F27E. Also check the engine bay fuse box.
3. Raise the vehicle safely. Setting the air suspension to 'Off-Road Height' can provide extra clearance. Locate the DMTL pump, which is situated above the spare tire, near the passenger-side rear wheel.
4. Visually inspect the electrical connector (C1339) and wiring going to the DMTL pump for any signs of damage, corrosion, chafing, or breaks.
5. With the ignition on, use a multimeter to test for 12V power and a good ground at the pump's electrical connector. A wiring diagram is recommended to identify the correct pins.
6. If power and ground are good, the DMTL pump itself is the most likely cause of failure. A DIY replacement takes 1-2 hours.
🎬 Watch this step-by-step guide to replacing the DMTL pump.
7. If power or ground is missing, trace the wiring back towards the PCM to find the open or short circuit. Pay close attention to areas where the harness is routed near the frame and check for ground points in the luggage compartment area.
8. If the pump and wiring are confirmed good, the issue may lie with the Powertrain Control Module (PCM), as noted in TSB SSM71298. This step requires professional diagnosis with Land Rover-specific software like SDD to run the 'Evaporative System Diagnostic Test'.

Parts You'll Likely Need

• EVAP Leak Detection Pump (DMTL) (OEM #WTR500030) — This is the component that most frequently fails, causing the P2450 code on this specific vehicle.
  Trusted brands: Bosch (OEM), Land Rover (Genuine), Dorman
  OEM price range: $200-$250
  Aftermarket price range: $150-$200

Related Codes That Often Appear With This One

• P2402 — This code indicates a high circuit condition for the same leak detection pump, suggesting a related electrical fault, such as a short to power or a failed pump motor.
• P0442 or P0456 — These codes indicate small and very small EVAP leaks. If the DMTL pump is failing mechanically and cannot build sufficient pressure, it may intermittently set leak codes before a hard circuit fault like P2450 appears.
• P2451 — This code indicates the EVAP switching valve is stuck closed, which is the opposite but mechanically related failure mode to P2450's 'stuck open' or performance issue.

Technical Service Bulletins (TSBs) & Recalls

• SSM71298: Notes that after following standard diagnostics, an internal module fault could be the cause for code P2450 and other related DMTL codes.

Platform-Specific Known Issues

• TSB SSM71298 indicates that if standard diagnostics do not reveal a fault with the pump or wiring, the cause may be an internal failure of a diagnostic module.
• The location of the pump above the spare tire makes its wiring susceptible to damage from road debris and corrosion.
• Some owners on forums report difficulty accessing the mounting bolts for the pump without moving the adjacent charcoal canister for clearance.

Mechanic-Grade Diagnostic Values

• DMTL Pump Resistance — expected: No official value published, but a known-good pump should have consistent resistance readings across its pins.. Failure: A user with a related code reported readings of ~30 Ohms on two pins and 100 Ohms on another from the ground pin on their failed pump, indicating internal circuit failure. An open circuit (infinite resistance) or short (zero resistance) would also indicate failure.
• DMTL Pump Connector Voltage — expected: 12V power at one pin with the ignition on.. Failure: Absence of 12V power indicates a wiring or fuse issue upstream of the pump.

Hidden / Shadow Codes Worth Checking

• P2450-00: The '-00' suffix is a Failure Type Code (FTC) or symptom byte. For this code, '-00' typically indicates a general component failure with no more specific information available from the self-test. It confirms the fault is with the component or its direct circuit rather than a related system. (see via Most comprehensive OBD-II scanners, including the Land Rover specific GAP IIDTool, will display this suffix.)

Scan Tool Commands That Help

• Land Rover SDD (Symptom Driven Diagnostics): 'Evaporative System Diagnostic Test' — Use this dealer-level function when basic checks on the pump and wiring are inconclusive. According to TSB LTB01007NAS1, this test can differentiate between a physical leak failure and an electrical/hardware failure, which is critical for diagnosing a P2450 circuit code.

Wiring & Ground Locations

• C1339 — The main electrical connector for the DMTL pump, located on the pump body above the spare tire.. This is the primary connector to test for power, ground, and signal, and to inspect for corrosion or damage.
• FUSE 19P / FUSE 27E — Located in the Central Junction Box (CJB), which is behind the glove compartment.. These 5-amp fuses are listed in wiring diagrams as being part of the EVAP system circuit. A blown fuse here would cut power to the DMTL pump and cause a circuit code.
• Luggage Compartment Ground Point — Behind the access panel for the taillights on the left (driver's) side of the luggage compartment.. This ground point serves the fuel pump and fuel level sensor. Given its proximity and relation to the fuel system, it is a highly probable ground location for the DMTL pump circuit and should be checked for corrosion or looseness.

Real Owner Repair Stories

• Land Rover Forums thread P2402-00 (2011 Land Rover LR4 5.0L V8) — Check Engine Light and a 'burping' sound from the gas tank.
  ❌ Tried (didn't work) The owner had an independent shop replace the DMTL pump, but the Check Engine Light and symptoms persisted.
  ✅ What actually fixed it The shop's next diagnostic step was to recommend replacing the purge valve, suspecting it was causing an intermittent fault that the ECU was misinterpreting as a DMTL pump issue. While the original poster did not confirm the final fix, this diagnostic path highlights a real-world scenario where simply replacing the DMTL pump is not the solution.

OEM Part Supersession History

• WTR500030 → LR174757 — Standard part number update by Land Rover. The parts are functionally identical.
• Bosch 0261222019 → N/A — This is the OEM part number from Bosch, who manufactures the pump for Land Rover. It is a direct cross-reference to Land Rover's WTR500030.
  Heads up: This part is identical to the genuine Land Rover part and is often sold at a lower price. It is also used on some Volvo and Jaguar models.

Model Year Variations Within This Range

• 2010-2013: Within the 5.0L V8 generation relevant to this article, there are no significant documented changes to the EVAP system or the DMTL pump (WTR500030) that would alter the diagnosis or repair of code P2450. The major powertrain change occurred in the 2014 model year with the introduction of the 3.0L V6.