AutoCodes – RAM – P2459 RAM

P2459 RAM Code - Diesel Particulate Filter Regeneration Too Frequent

Quick Answer

The engine aftertreatment system monitors the soot load in the Diesel Particulate Filter. Common causes include Diesel Particulate Filter (DPF) Restricted, Faulty Diesel Particulate Filter, Fuel system or air handling system sensor failure. 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: P2459 RAM indicates Diesel Particulate Filter Regeneration Too Frequent.
Common causes: Common causes include Diesel Particulate Filter (DPF) Restricted, Faulty Diesel Particulate Filter, Fuel system or air handling system sensor failure.
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 8,686

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 Jul 29, 2021

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

The engine aftertreatment system monitors the soot load in the Diesel Particulate Filter. Under normal operating conditions the Diesel Particulate Filter is self-cleaning, where soot is converted to ash. The soot load in the aftertreatment Diesel Particulate Filter (DPF) is estimated using the Exhaust Differential Pressure Sensor and the calculated soot output of the engine. The Powertrain Control Module (PCM) will set this fault if it detects that the time between two regeneration events is less than the calibrated time threshold. The PCM will illuminate the MIL lamp immediately when the diagnostic runs and fails. The driver will be notified via the vehicle's EVIC Message Center. The PCM will turn off the MIL lamp immediately after the soot load has dropped below the Moderately Severe Level Threshold. The Diagnostic Trouble Code (DTC) will set if between two Diesel Particular Filter regeneration events, the DPF soot loading rate is faster than the threshold or if the time between two regeneration events is less than the calibrated time threshold.

OBDII Code P2459 RAM - Diesel Particulate Filter Regeneration Too Frequent - AutoCodes.com — P2459 RAM Code - Diesel Particulate Filter Regeneration Too Frequent

What does this mean?

What are the Possible Causes of the DTC P2459 RAM?

Diesel Particulate Filter (DPF) Restricted
Faulty Diesel Particulate Filter
Fuel system or air handling system sensor failure
Base engine failure
Fuel system failure
Air handling system failure

How to Fix the DTC P2459 RAM?

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 RAM 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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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 P2459 RAM Code

What does OBDII code P2459 mean?

OBDII code P2459 indicates that the diesel particulate filter (DPF) regeneration process is occurring too frequently, which can signify issues with the DPF or exhaust system.

What are the common symptoms of code P2459?

Common symptoms include a warning light on the dashboard, reduced engine performance, increased fuel consumption, and excessive black smoke from the exhaust.

What causes the P2459 code to trigger?

The P2459 code can be triggered by a malfunctioning DPF, issues with the EGR system, faulty sensors, or problems with the exhaust system that affect regeneration cycles.

How can I diagnose the P2459 code?

To diagnose the P2459 code, use an OBDII scanner to check for additional codes, inspect the DPF and EGR system, and monitor the regeneration process and exhaust temperatures.

What are some potential repairs for code P2459?

Potential repairs include cleaning or replacing the DPF, repairing or replacing faulty sensors, addressing any EGR system issues, and ensuring the exhaust system is functioning correctly.

Can driving conditions affect the P2459 code?

Yes, frequent short trips and stop-and-go driving conditions can prevent the DPF from reaching the necessary temperatures for proper regeneration, potentially leading to the P2459 code.

Is it safe to drive with the P2459 code?

While it may be safe to drive for a short time, it is advisable to address the underlying issue as prolonged driving can lead to more severe engine and exhaust system damage.

How can I prevent P2459 code from occurring?

To prevent the P2459 code, ensure regular maintenance of the exhaust system, perform periodic DPF cleaning, and use high-quality diesel fuel that supports proper combustion.

Should I clear the P2459 code after repairs?

Yes, after performing the necessary repairs, you should clear the code with an OBDII scanner and monitor for any reoccurrence of the issue during subsequent driving.