How is fault code P1475 fixed?

- Command the pump with a scan tool and watch the switch signal for state changes - Check continuity of the signal wire from the pump connector through to the module pin - Inspect the connector for corrosion, moisture and pushed-back pins - Wiggle test the harness during the commanded test to catch an intermittent open - Verify the pump has proper power and ground before condemning it - Replace the leak detection pump if the internal switch never changes state - Clear codes and rerun the EVAP monitor

Fan Relay (Low) Circuit Malfunction

Jump to the fix

Severity

Medium

Can I keep driving?

Usually drivable, but get it diagnosed without delay.

First step

Command the pump with a scan tool and watch the switch signal for state changes

PPowertrain
1Manufacturer-specific
4Powertrain (Other)
75Sequence number

What does it mean?

P1475 is a Powertrain (engine, transmission, fuel system) fault code. It indicates: EVAP Emission Control LDP Circuit Malfunction/Signal Circuit Open .

Symptoms

MIL on with an EVAP code stored
EVAP monitor does not complete
No feedback pulses visible on the scan tool while the pump is commanded
Engine runs and drives normally
Emissions readiness stays not ready

Likely causes

Open in the leak detection pump signal or switch wire back to the module
Failed diaphragm or reed switch inside the pump, so no feedback pulses are produced
Backed-out or corroded terminal in the pump connector
Broken conductor in the rear underbody harness
Poor ground reference for the switch circuit
Module input circuit fault

How to fix it

Command the pump with a scan tool and watch the switch signal for state changes
Check continuity of the signal wire from the pump connector through to the module pin
Inspect the connector for corrosion, moisture and pushed-back pins
Wiggle test the harness during the commanded test to catch an intermittent open
Verify the pump has proper power and ground before condemning it
Replace the leak detection pump if the internal switch never changes state
Clear codes and rerun the EVAP monitor

Codes From the Same System

All Fault Codes

Related Similar Codes

This information follows the generic OBD-II definition and does not replace a vehicle-specific diagnosis. The severity rating is rule-based; an authorised diagnostic reading is required for a definitive answer.