AutoCodes – Chevrolet – P2456 Chevrolet

P2456 Chevrolet Code - Diesel Particulate Filter Differential Pressure Sensor Circuit Intermittent

Quick Answer

The diesel exhaust aftertreatment system consists of an underhood pre-catalytic converter and an underbody catalyst converter. Common causes include Faulty Diesel Particulate Filter (DPF) Pressure Sensor, Diesel Particulate Filter Pressure Sensor harness is open or shorted, Diesel Particulate Filter Pressure 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: P2456 Chevrolet indicates Diesel Particulate Filter Differential Pressure Sensor Circuit Intermittent.
Common causes: Common causes include Faulty Diesel Particulate Filter (DPF) Pressure Sensor, Diesel Particulate Filter Pressure Sensor harness is open or shorted, Diesel Particulate Filter Pressure 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 861

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 28, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P2456 Chevrolet Description

The diesel exhaust aftertreatment system consists of an underhood pre-catalytic converter and an underbody catalyst converter. The underbody catalyst converter also consists of the main Diesel Oxidation Catalyst and the coated Diesel Particulate Filter (DPF). One of the main purposes of the DPF is to collect particulates from the engine exhaust in order to minimize discharge of soot to the atmosphere. The soot particles accumulate in the channels of the DPF and are burned off at regular intervals through a process called regeneration. This prevents the DPF from clogging. The Engine Control Module (ECM) commands the DPF regeneration after calculating various vehicle conditions such as DPF pressure difference, exhaust gas temperature, engine oil quality, engine speed, etc. Excessive accumulation of the soot in the DPF can cause a drop in the engine performance. During regeneration, additional fuel is injected via multiple post injections in order to increase the exhaust gas temperature. During this period, the DPF temperature is raised to approximately 600°C (1112°F) and the accumulated soot is oxidized or burned off into carbon dioxide (CO2). The Diagnostic Trouble Code (DTC) will be set when the ECM detects an implausible DPF differential pressure sensor signal.

OBDII Code P2456 Chevrolet - Diesel Particulate Filter Differential Pressure Sensor Circuit Intermittent - AutoCodes.com — P2456 Chevrolet Code - Diesel Particulate Filter Differential Pressure Sensor Circuit Intermittent

What does this mean?

What are the Possible Causes of the DTC P2456 Chevrolet?

Faulty Diesel Particulate Filter (DPF) Pressure Sensor
Diesel Particulate Filter Pressure Sensor harness is open or shorted
Diesel Particulate Filter Pressure Sensor circuit poor electrical connection
Diesel particulate filter pressure sensor connecting hose is loose, cracked, or missing
Faulty Engine Control Module (ECM)

How to Fix the DTC P2456 Chevrolet?

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 P2456 Chevrolet 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 P2456 Chevrolet code?

Need more information on how to fix the P2456 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2456 Chevrolet code diagnosed by a professional: Find a repair shop in your area

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 P2456 Chevrolet Code

1. What are the common symptoms of OBDII code P2456 in a Chevrolet related to the Diesel Particulate Filter Differential Pressure Sensor Circuit Intermittent?

- Common symptoms include poor engine performance, decreased fuel efficiency, and the illumination of the Check Engine Light.

2. What are the possible causes of OBDII code P2456 in a Chevrolet?

- Possible causes include a faulty diesel particulate filter differential pressure sensor, damaged wiring or connectors, or issues with the diesel particulate filter itself.

3. How can I diagnose the OBDII code P2456 in a Chevrolet?

- Diagnosing this code typically involves using a scan tool to retrieve the fault codes, inspecting the differential pressure sensor and its circuit, and checking for any issues with the diesel particulate filter.

4. Can I continue driving my Chevrolet with OBDII code P2456 present?

- It is not recommended to continue driving your vehicle with this code present, as it can lead to further damage and increased emissions. It's best to address the issue promptly.

5. How can I repair OBDII code P2456 in a Chevrolet?

- Repair options may include replacing the diesel particulate filter differential pressure sensor, repairing damaged wiring or connectors, or addressing any issues with the diesel particulate filter itself.

6. Are there any preventative maintenance tips to avoid OBDII code P2456 in a Chevrolet?

- Regularly servicing and maintaining your vehicle's diesel particulate filter system can help prevent issues that lead to this code. Following the manufacturer's recommended maintenance schedule is key.

7. Can a DIY enthusiast fix OBDII code P2456 in a Chevrolet?

- While some experienced DIY enthusiasts may be able to diagnose and replace the faulty components causing this code, it's recommended to consult a professional mechanic for proper diagnosis and repair.

8. Will resetting the Check Engine Light clear OBDII code P2456 in a Chevrolet?

- Resetting the Check Engine Light may temporarily clear the code, but if the underlying issue causing P2456 is not addressed, the code is likely to reappear.

9. What is the typical cost to repair OBDII code P2456 in a Chevrolet at a professional auto repair shop?

- The cost of repairing this code can vary depending on the exact cause of the issue and the labor rates in your area. It's best to get a diagnostic and repair estimate from a trusted auto repair shop.

10. Can OBDII code P2456 in a Chevrolet cause any long-term damage if left untreated?

- Ignoring this code can potentially lead to reduced engine performance, increased emissions, and damage to other components in the emissions control system. It's important to address the issue promptly to prevent further damage.