AutoCodes – Generic – P1476

P1476 Code - Particulate Matter Sensor Electrode Supply Circuit High 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: P1476 indicates Particulate Matter Sensor Electrode Supply Circuit High 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 28,645

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
FAQs
Comments
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Code P1476 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 P1476 - Particulate Matter Sensor Electrode Supply Circuit High Voltage - AutoCodes.com — P1476 Code - Particulate Matter Sensor Electrode Supply Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1476?

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 P1476?

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 P1476 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.

Need more information about the P1476 code?

Need more information on how to fix the P1476 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1476 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1476 Audi — EVAP Control System LDP Malfunction/Insufficient Vacuum
P1476 BMW — Leakage Diagnostic Pump Clamped Tube
P1476 Buick — Particulate Matter Sensor Electrode Supply Circuit High Voltage
P1476 Cadillac — Particulate Matter Sensor Electrode Supply Circuit High Voltage
P1476 Chevrolet — Particulate Matter Sensor Electrode Supply Circuit High Voltage
P1476 Chrysler — Too Little Secondary Air Injected
P1476 Dodge — Too Little Secondary Air Injected
P1476 GMC — Particulate Matter Sensor Electrode Supply Circuit High Voltage
P1476 Mazda — Fan Relay Circuit High voltage
P1476 MINI — Leakage Diagnostic Pump Clamped Tube
P1476 Volkswagen — EVAP Control System LDP Malfunction/Insufficient Vacuum

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.

Frequently Asked Questions about P1476 Code

1. What are the common symptoms of OBDII code P1476?

- Common symptoms include the Check Engine Light coming on, decreased fuel efficiency, rough idling, and potential issues with the exhaust system.

2. What can cause the OBDII code P1476 to trigger?

- The code P1476 can be triggered by a faulty particulate matter sensor, a damaged wiring harness, or issues with the electrode supply circuit, resulting in high voltage readings.

3. How serious is the OBDII code P1476?

- While the code P1476 may not cause immediate drivability issues, it can lead to increased emissions and potential long-term damage to the vehicle's exhaust system if left unrepaired.

4. How can I diagnose the cause of OBDII code P1476?

- Diagnosis typically involves using a scan tool to read the code, inspecting the particulate matter sensor and its wiring, and testing the electrode supply circuit for proper voltage.

5. Can I continue driving with OBDII code P1476?

- It is not recommended to ignore the code P1476 and continue driving, as it can lead to more severe problems over time. It is best to address the issue promptly.

6. What are the repair options for OBDII code P1476?

- Repair options may include replacing the faulty particulate matter sensor, repairing or replacing damaged wiring, or addressing issues with the electrode supply circuit to resolve the high voltage readings.

7. How much does it typically cost to repair OBDII code P1476?

- The cost of repairing OBDII code P1476 can vary depending on the extent of the issue, the parts needed for repair, and labor costs. It is advisable to consult a mechanic for an accurate estimate.

8. Can a DIY enthusiast fix OBDII code P1476?

- While some DIY enthusiasts may have the skills to diagnose and repair OBDII code P1476, it is recommended to consult a professional mechanic for accurate diagnosis and proper repair to ensure the issue is resolved effectively.

9. Are there any preventive measures to avoid OBDII code P1476?

- Regular maintenance of the vehicle's emission control system, including checking the particulate matter sensor and wiring, can help prevent issues that may trigger OBDII code P1476.

10. How long does it take to repair OBDII code P1476?

- The repair time for OBDII code P1476 can vary depending on the specific cause of the issue, the availability of parts, and the mechanic's expertise. In general, it may take a few hours to a day to complete the repair.