P2407 on 2013-2016 Volkswagen CC: EVAP Leak Detection Pump Circuit Fixes

What's Unique About the 2013-2016 Volkswagen CC

For this generation of Volkswagen CC and its platform mates (like the Passat and Tiguan), the P2407 code is a known issue. The Leak Detection Pump is located underneath the rear of the vehicle, often behind the passenger-side wheel well liner, where its electrical connector is highly susceptible to corrosion from road salt, water, and debris. This exposure makes the connector a primary suspect for this 'intermittent circuit' fault. The internal reed switch in the pump is also a common point of failure from age and use.

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 inspection because the EVAP monitor will not reach 'Ready' status.
• In rare cases, a faint fuel odor may be noticeable near the rear of the vehicle.
• On some performance-tuned vehicles, owners have reported that related engine features (like exhaust pops and crackles) may disappear when this code is pending, as the ECU enters a different operating state.

Most Likely Causes

1. Corroded or Damaged LDP Electrical Connector 🔴 High Probability The LDP is mounted underneath the car near the rear axle, exposing its connector to water, road salt, and debris, which commonly causes corrosion ('green crusties') on the electrical pins.
   How to confirm: Visually inspect the LDP connector, which is often behind the rear passenger-side wheel well liner. Unplug it and look for any green or white powder, bent pins, or moisture inside the connector. Wiggling the harness while monitoring sensor voltage with a scan tool can also pinpoint an intermittent connection.
   Typical fix: Clean the connector terminals with an electrical contact cleaner and a small brush. Apply dielectric grease upon reassembly to prevent future moisture intrusion. If corrosion is severe, the connector pigtail may need to be replaced.
   Est. part cost: $5-$40
2. Faulty EVAP Leak Detection Pump (LDP) 🔴 High Probability The internal sensor (often a reed switch) within the pump assembly is a common failure point. Wear and tear from millions of cycles can cause it to send erratic signals back to the ECM.
   How to confirm: If the connector and wiring are confirmed to be good, the pump itself is the likely culprit. 🎬 Watch: A mechanic demonstrates how to replace the LDP on a Volkswagen. A bi-directional scan tool can command the pump to run while monitoring the sensor voltage; erratic readings or a voltage that drops to 0V confirm a bad pump.
   Typical fix: Replace the Leak Detection Pump. It is typically 🎬 Watch: This video shows how to replace the pump on a Passat. mounted on or near the charcoal canister with two or three nuts. The OEM part number is often 1K0 906 253 A or a similar variant.
   Est. part cost: $70-$150
3. Damaged Wiring Harness 🟡 Medium Probability The wiring harness running to the LDP can be damaged by road debris, improper jacking, rodents, or chafing against chassis components.
   How to confirm: Perform a continuity test on the wires between the LDP connector and the Engine Control Module (ECM) using a multimeter and a wiring diagram. Check for shorts to power or ground. A visual inspection may reveal obvious breaks or chafing.
   Typical fix: Repair or splice the damaged section of the wire. Ensure the repair is sealed with heat-shrink tubing to prevent moisture intrusion.
   Est. part cost: $1-$10

Rare But Worth Checking

• Faulty Powertrain Control Module (PCM/ECM): This is extremely rare. The PCM should only be considered after all other possibilities (pump, connector, wiring) have been exhaustively tested and ruled out. A faulty PCM input circuit can mimic a bad sensor.

Diagnosis Steps

1. Read the code with an OBD-II scanner and confirm P2407 is present. Note any other codes.
2. Locate the Leak Detection Pump (LDP) and charcoal canister. On the VW CC, this is typically found by removing the rear passenger-side wheel and the fender liner 🎬 See this walkthrough for accessing and replacing a faulty pump. to gain access.
3. Perform a thorough visual inspection of the LDP's electrical connector. Disconnect it and check for any signs of corrosion (green/white powder), moisture, or damaged pins.
4. If corrosion is found, clean the terminals on both the pump and the connector thoroughly with electrical contact cleaner and a small wire brush. Apply dielectric grease and reconnect. Clear the code and drive to see if it returns.
5. If the connector is clean, inspect the wiring harness leading to the pump for any visible damage, chafing, or breaks.
6. If a bi-directional scan tool is available, command the LDP to activate and monitor the sense circuit voltage in the live data stream. A stable voltage (typically 4.5-5.0V) indicates a good circuit, while a signal that jumps around, spikes, or drops to zero confirms an intermittent fault.
7. If the wiring and connector are good, but the pump fails the active test or the signal remains erratic, replace the Leak Detection Pump.
8. If the problem persists after replacing the pump, perform a continuity and resistance test on the wiring between the LDP connector and the ECM to rule out a hidden wire break or short circuit.

Parts You'll Likely Need

• EVAP Leak Detection Pump (OEM #1K0906253A (Verify with VIN)) — This is the most common part to fail for a P2407 code, as the internal sensor that provides the 'sense circuit' signal wears out or fails.
  Trusted brands: Bosch, URO Parts, Genuine Volkswagen
  OEM price range: $120-$180
  Aftermarket price range: $70-$150
• LDP Connector Pigtail (OEM #1J0973703 (Verify with VIN)) — If the connector itself is too corroded to be cleaned, replacing the pigtail is necessary to ensure a solid electrical connection.
  Trusted brands: Genuine Volkswagen, Dorman
  OEM price range: $25-$45
  Aftermarket price range: $15-$30
• Electrical Contact Cleaner — Often, the problem is simply corrosion on the LDP connector, and cleaning it can resolve the issue without replacing parts.
  Trusted brands: CRC, WD-40
  OEM price range: $8-$15
  Aftermarket price range: $8-$15

Technical Service Bulletins (TSBs) & Recalls

• VIN-4-A-PIN APRI (2016 FUEL SYSTEM, OTHER, dated 2016-04-21): Mentions MIL-ON due to fault P2407 in the ECM. This is a generic TSB acknowledging the code.
• VIN-4-A-PIN APRI (2015 AIR BAGS, dated 2016-04-13): Also lists MIL-ON with fault P2407 in the ECM. This is a generic TSB acknowledging the code.
• Audi TSB 2071770/5 (March 29, 2024): While for newer Audi models (Q3/Q5), this TSB addresses P2407 and indicates a fix via an ECM software update due to overly sensitive OBD diagnostics, showing that manufacturers sometimes address this logic-based fault with software rather than hardware.

Platform-Specific Known Issues

• Volkswagen has issued Technical Service Bulletins (TSBs) that include P2407 as a potential fault causing the Malfunction Indicator Lamp (MIL) to turn on for this vehicle range, confirming it is a recognized issue by the manufacturer.
• Owner experiences on forums frequently cite resolving P2407 by either thoroughly cleaning the green corrosion from the LDP connector or replacing the pump itself after finding the connector to be clean.

Mechanic-Grade Diagnostic Values

• LDP Sense Circuit Voltage (Live Data) — expected: Stable 4.5V - 5.0V when the pump is commanded on. Failure: Voltage jumps around, spikes, or drops to 0V, indicating an intermittent signal.
• LDP Ground Strap Resistance — expected: < 0.1 Ω (Ohms) between the ground strap and the chassis. Failure: A reading higher than 0.1 Ω indicates a poor ground, which can cause floating voltage and erratic signals.
• LDP Internal Sensor Resistance — expected: Typically 300–500 Ω (Ohms). Failure: A reading outside this range suggests the internal sensor in the pump has failed.

Scan Tool Commands That Help

• VCDS (Ross-Tech) or equivalent bi-directional scanner: Output Test (or Active Test) for the EVAP Leak Detection Pump — This function is crucial for diagnosing a P2407. It allows the technician to manually command the LDP to turn on while observing the sense circuit's voltage in live data. If the voltage is erratic while the pump is commanded on, it confirms an electrical fault in the circuit, connector, or pump itself, helping to isolate the problem without guesswork.

Wiring & Ground Locations

• Leak Detection Pump (LDP) — In the right rear wheel well, typically mounted to the charcoal canister.. This is the primary component for the P2407 code. Its location exposes its electrical connector to road spray and debris, making corrosion a very common cause of the erratic circuit fault.
• Engine Control Module (ECM) — In the center of the plenum chamber, at the base of the windshield under the hood.. The ECM is the destination for the LDP sense circuit signal. In very rare cases of persistent faults after replacing the pump and wiring, the ECM's input circuit could be the issue.
• Ground Point G639 — Located in the left kick panel area, inside the passenger cabin.. While not the direct ground for the LDP, it is a major ground point for the vehicle electrical system control module. A poor ground here can cause a variety of difficult-to-diagnose electrical issues. A more direct cause for P2407 is a poor ground at the pump itself due to corrosion.

Real Owner Repair Stories

• iCarsoft CR Ultra P Customer Review (Honda Civic (similar EVAP system design)) — P2407 code appeared intermittently, particularly after rainfall.
  ❌ Tried (didn't work) Initial code scanning without further diagnosis.
  ✅ What actually fixed it The LDP connector was found to be corroded. The final fix was cleaning the connector with electrical contact cleaner and clearing the code. The part did not need to be replaced.

OEM Part Supersession History

• 7L0906243 → 7L0-906-243-A — Part revision or manufacturer change. This is common for electronic components to improve reliability or change suppliers.
  Heads up: The new part number 7L0-906-243-A is a direct replacement for the older 7L0906243. While this specific part number may not be for the CC, it shows a common pattern for VW LDPs.