Failed leak diagnostic pump assembly, specifically a stuck or worn reed switch inside the pump.; Corroded, broken, or shorted wiring in the pump's electrical connector or harness.; A blown fuse or relay that supplies power to the leak diagnostic pump.; Engine control module (ECM) software or internal driver fault that fails to recognize the reed switch signal.; Mechanical binding of the pump's internal vane, preventing rotation and reed switch closure.; Water or debris intrusion into the pump housing, causing the reed switch to stick open.

DTC codes / BMW codes / P1475

P1475 · BMWLeakage Diagnostic Pump Reed Switch Did Not Close

Q: What does code P1475 mean?

Leakage Diagnostic Pump Reed Switch Did Not Close. P1475 on BMW vehicles means the engine control module commanded the leak diagnostic pump to run, but the reed switch inside the pump did not close as expected. The reed switch is a magnetic contact that confirms the pump's internal vane is rotating, so the module sets this code when it sees no closure signal during the self-test.

P1475 on BMW vehicles means the engine control module commanded the leak diagnostic pump to run, but the reed switch inside the pump did not close as expected. The reed switch is a magnetic contact that confirms the pump's internal vane is rotating, so the module sets this code when it sees no closure signal during the self-test.

SystemPowertrain

Code typeBMW specific

SeverityLow

Fix difficultyIntermediate

AreaAuxiliary emission controls

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms.
A pending fault that returns after each drive cycle once the leak test runs.
In rare cases, a slight fuel odor or hiss if the pump housing or its seal is compromised.
No change in engine performance, fuel economy, or drivability in most cases.
Other evaporative emission (EVAP) codes stored alongside P1475 if the pump cannot complete its test.

Common causes, most likely first

Failed leak diagnostic pump assembly, specifically a stuck or worn reed switch inside the pump.
Corroded, broken, or shorted wiring in the pump's electrical connector or harness.
A blown fuse or relay that supplies power to the leak diagnostic pump.
Engine control module (ECM) software or internal driver fault that fails to recognize the reed switch signal.
Mechanical binding of the pump's internal vane, preventing rotation and reed switch closure.
Water or debris intrusion into the pump housing, causing the reed switch to stick open.

How to diagnose and fix it

Scan all modules and record freeze-frame data to confirm P1475 is the primary fault and not a secondary code.
Inspect the leak diagnostic pump connector and harness for corrosion, chafing, or loose pins, and repair as needed.
Check the fuse and relay that feed the leak diagnostic pump circuit, replacing any failed component.
Command the leak diagnostic pump on with a scan tool and listen for pump operation while monitoring reed switch status.
Measure resistance and continuity of the reed switch circuit at the pump connector to verify switch closure.
If the reed switch does not close during activation, replace the leak diagnostic pump assembly.
Clear codes and run the EVAP monitor to completion to confirm the repair.

Reed switch failures that mimic pump faults

A reed switch that sticks open is far more common than a completely dead pump motor, so technicians who replace only the motor miss the actual fault.
Corrosion inside the pump connector can imitate a failed reed switch because the module never sees the switch close even though the pump runs.
A weak or failing battery can cause erratic leak pump operation and set P1475 without any permanent pump defect.
After replacing the pump, the EVAP monitor must complete a full leak test before the code can be considered repaired, which may require a specific fuel level and cold soak.
This code does not always mean the pump is bad; a pinched or shorted wire in the harness can hold the reed switch signal low and trigger the same fault.

Can I keep driving with P1475?

The vehicle remains safe to drive because P1475 affects only the evaporative emission self-test and does not alter engine operation. Avoid topping off the fuel tank past the first click and schedule diagnosis soon so the EVAP monitor can run and confirm the repair.

Tools that help

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