P2463 - DPF Soot Accumulation Diagnostic Tips

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The Diesel Particulate Filter (DPF) has done a great job of removing dangerous particles from the air we breathe, but has also caused some headaches in the automotive trade. One of the main questions we receive at VACC’s TechAdvisory Service about DPF issues is how to repair recurring soot accumulation fault codes.

This can be a complicated problem, but we will give you some diagnostic steps to narrow down the cause. DPF Life Span You should assess the vehicle’s age and mileage as DPF units have a life span. As they regenerate, the soot particles are burned to smaller ash particles which will remain inside the DPF channels. As this ash builds up it will eventually block the DPF. No number of regenerations will unblock the DPF as you can’t burn ash twice. The only options are removal for cleaning (more on this later) or replacement with a new DPF assembly.

Soot load reading and DPF Differential Pressure Sensor readings should be checked and we have provided some know good values for both in the June 2023 TechTalk magazine.

If the DPF is blocked, there are now aftermarket DPF cleaning services that can remove ash and soot build up and can return the DPF unit back to near new condition.

We have written various TechTalk articles about DPF operation and known faults for specific vehicles. It is highly recommended to have a read of these past articles to get an overview of the various systems and known faults which might assist you with your problem.

DPF for Dummies or DPF Facts:
Tech Talk April 2015 page 3964

Subaru EE20 Diesel: DPF Regen Update.
Tech Talk January / February 2020 page 4984

Toyota 1GD-FTV / 2GD-FTV: 5th Injector Troubles
Tech Talk September 2021 page 5102

Holden Captiva Z22D1: Splitting Intake and Intercooler Hoses
Tech Talk November 2020 page 4956

Diesel Fuel Vaporisers: DPF Regeneration System
Tech Talk Jan / Feb 2019 page 4637

DENSO: How to Extend DPF Life
Tech Talk September 2021 page 5108

PSA FAP / DPF System: Fuel Borne Catalysts
Tech Talk May 2019 page 4692

DENSO: Diesel Particulate Filter Problems
Tech Talk July 2021 page 5076

Toyota DPF Manual Regeneration
Tech Talk April 2019 page 4674

Toyota Coaster Diesel DPF Fault
Tech Talk April 2015 page 3969

Mazda 2.0L MZR-CD: DPF System Overview & Common Faults Codes
Tech Talk June 2017 page 4348

VACC MotorTech members have access to an extensive technical information resource, a Technical Advisory Service and library staffed by experienced technicians, along with a comprehensive online resource, Tech Online, Tech Times Guide, Tech Estimate and Tech Talk magazine, plus online resources from Haynes - Haynes Pro and Haynes AllAccess, allowing you to repair and service more makes and models than your competition.

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