AutoCodes – GMC – P2459 GMC

P2459 GMC Code - Diesel Particulate Filter Regeneration Frequency

Quick Answer

The soot particles accumulate in the channels of the Diesel Particulate Filter (DPF) and are burned off at regular intervals, through a process called regeneration or cleaning. Common causes include Perform the Diesel Particulate Filter Service Regeneration, Faulty Exhaust Particulate Filter. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P2459 GMC indicates Diesel Particulate Filter Regeneration Frequency.
Common causes: Common causes include Perform the Diesel Particulate Filter Service Regeneration, Faulty Exhaust Particulate Filter.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 13,177

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 29, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P2459 GMC Description

The soot particles accumulate in the channels of the Diesel Particulate Filter (DPF) and are burned off at regular intervals, through a process called regeneration or cleaning. The DPF cleaning process prevents the DPF from clogging. Excess soot in the filter can cause a drop in engine performance and crack the filter during regeneration. The Diagnostic Trouble Code (DTC) will be set when the Engine Control Module (ECM) detects that the actual soot level is greater than an expected soot level when regeneration is triggered.

OBDII Code P2459 GMC - Diesel Particulate Filter Regeneration Frequency - AutoCodes.com — P2459 GMC Code - Diesel Particulate Filter Regeneration Frequency

What does this mean?

What are the Possible Causes of the DTC P2459 GMC?

Perform the Diesel Particulate Filter Service Regeneration
Faulty Exhaust Particulate Filter

How to Fix the DTC P2459 GMC?

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 P2459 GMC 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 P2459 GMC code?

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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.