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DTC codes / Volkswagen codes / P1470

P1470 · VolkswagenEVAP Emission Control System LDP Circuit Electrical Malfunction

P1470 on Volkswagen vehicles indicates that the engine control module has detected an electrical fault in the Leak Detection Pump (LDP) circuit, which is part of the evaporative emission control system. The computer monitors the LDP's electrical circuit for expected voltage or current and flags this code when the signal is out of range, indicating an open, short, or component failure.

SystemPowertrain
Code typeVolkswagen specific
SeverityLow
Fix difficultyIntermediate
AreaAuxiliary emission controls

Symptoms you may notice

  • Illumination of the check engine light, often with no other noticeable symptoms.
  • A slight fuel odor may be present if the LDP fails to seal the EVAP system properly.
  • In some cases, a rough idle or hesitation may occur if the fault affects other circuits sharing the same harness.
  • The vehicle may fail an emissions inspection due to the stored code.
  • No drivability issues are typically observed, as the LDP only operates during specific self-test conditions.

Common causes, most likely first

  1. Faulty Leak Detection Pump (LDP) solenoid or internal electrical failure.
  2. Damaged or corroded wiring harness or connector at the LDP.
  3. Open or short circuit in the LDP power or ground circuit.
  4. Failed engine control module (ECM) driver for the LDP circuit, though rare.
  5. Corrosion or water intrusion in the LDP connector or pump housing.
  6. Blown fuse or relay supplying power to the LDP circuit.

How to diagnose and fix it

  1. Perform a visual inspection of the LDP, its connector, and wiring for damage, corrosion, or loose pins.
  2. Check the fuse and relay that supply power to the LDP circuit and replace if faulty.
  3. Use a scan tool to command the LDP on and off while listening for the pump to activate; no sound indicates a possible faulty pump or circuit.
  4. Measure resistance and voltage at the LDP connector according to the manufacturer's specifications to identify open or short circuits.
  5. Test the LDP solenoid directly by applying 12 volts and ground to confirm it operates; replace the pump if it does not.
  6. Inspect the wiring harness between the LDP and ECM for continuity and shorts to ground or power; repair as needed.
  7. If all electrical checks pass, suspect the ECM; however, verify all other possibilities before replacing the ECM.

LDP Circuit Faults Often Misdiagnosed

  • A common mistake is replacing the LDP without checking the wiring harness, as chafed or corroded wires near the pump are frequent causes of this code.
  • The LDP only runs during specific engine-off conditions, so a faulty pump may not show symptoms during a normal drive; a commanded activation test is essential.
  • This code can be set by a poor ground connection at the LDP mounting point, which is often overlooked during diagnosis.
  • Some technicians confuse P1470 with other EVAP codes like P0442 or P0455, but P1470 specifically points to an electrical fault in the LDP circuit, not a leak.
  • After repairs, the EVAP system may require several drive cycles for the code to clear and the monitor to run; immediate clearing may not be possible.

Can I keep driving with P1470?

The vehicle is safe to drive with this code because the LDP only affects emissions and does not impact engine performance. However, avoid ignoring the check engine light, as prolonged driving with a faulty EVAP system can lead to increased emissions and potential inspection failure.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for Volkswagen vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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