AutoCodes – Generic – P1475

P1475 Code - Particulate Matter Sensor Electrode Supply Circuit Low Voltage

Quick Answer

The Particulate Matter (PM) sensor monitors the amount of the particulates (soot) in the diesel exhaust gas exiting the tailpipe. Common causes include Faulty Exhaust Particulate Matter Sensor, Exhaust Particulate Matter Sensor harness is open or shorted, Exhaust Particulate Matter Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1475 indicates Particulate Matter Sensor Electrode Supply Circuit Low Voltage.
Common causes: Common causes include Faulty Exhaust Particulate Matter Sensor, Exhaust Particulate Matter Sensor harness is open or shorted, Exhaust Particulate Matter Sensor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 24,359

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 30, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1475 Description

The Particulate Matter (PM) sensor monitors the amount of the particulates (soot) in the diesel exhaust gas exiting the tailpipe. The PM sensor is similar to the heated oxygen sensor with a ceramic element but also includes an individually calibrated Sensor Control Unit (SCU). The sensing element includes comb-shaped Interdigital Electrodes (IDE), a heater and a positive temperature coefficient resistor for temperature measurement.
The operation of the PM Sensor is based on the electrical conductivity characteristic of the diesel particulate. As the exhaust gas flows over the sensing element, soot is absorbed in the combs between the electrodes, eventually creating a conductive path. When the path is formed, it generates a current based on the voltage being applied to the element. The measurement process continues until a preset current value is reached. To avoid misleading readings, the sensor performs a regeneration where the soot is cleaned off by heating up the element before the measurement phase begins. The amount of regenerations is based on vehicle strategy; when the calibrated number of regenerations is reached, the cumulative current readings are used to determine the amount of soot concentration in the exhaust gas which in turn determines the collection efficiency of the Diesel Particulate Filter (DPF).
The Diagnostic Trouble Code (DTC) will be set when the particular matter sensor control unit detects a fault in the particulate matter sensor circuitry.

OBDII Code P1475 - Particulate Matter Sensor Electrode Supply Circuit Low Voltage - AutoCodes.com — P1475 Code - Particulate Matter Sensor Electrode Supply Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1475?

Faulty Exhaust Particulate Matter Sensor
Exhaust Particulate Matter Sensor harness is open or shorted
Exhaust Particulate Matter Sensor circuit poor electrical connection

How to Fix the DTC P1475?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1475 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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Information for Specific Makes

P1475 Audi — EVAP Control System LDP Malfunction/Signal Circuit Open
P1475 BMW — Leakage Diagnostic Pump Reed Switch Did Not Close
P1475 Buick — Particulate Matter Sensor Electrode Supply Circuit Low Voltage
P1475 Cadillac — Particulate Matter Sensor Electrode Supply Circuit Low Voltage
P1475 Chevrolet — Particulate Matter Sensor Electrode Supply Circuit Low Voltage
P1475 Dodge — EGR Valve Position
P1475 GMC — Particulate Matter Sensor Electrode Supply Circuit Low Voltage
P1475 Mazda — Fan Relay Circuit Low Voltage
P1475 MINI — Leakage Diagnostic Pump Reed Switch Did Not Close
P1475 Volkswagen — EVAP Control System LDP Malfunction/Signal Circuit Open

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.