AutoCodes – Generic – P2456

P2456 Code - Diesel Particulate Filter Pressure Sensor 'A' Circuit Intermittent/Erratic

Quick Answer

The Powertrain Control Module (PCM) monitors the rationality of the Diesel Particulate Filter (DPF) pressure sensor during idle and part load operating conditions. Common causes include Faulty Diesel Particulate Filter (DPF) Pressure Sensor, Diesel Particulate Filter (DPF) Pressure Sensor harness is open or shorted, Diesel Particulate Filter (DPF) 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 indicates Diesel Particulate Filter Pressure Sensor 'A' Circuit Intermittent/Erratic.
Common causes: Common causes include Faulty Diesel Particulate Filter (DPF) Pressure Sensor, Diesel Particulate Filter (DPF) Pressure Sensor harness is open or shorted, Diesel Particulate Filter (DPF) 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.

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Code Popularity 30,076

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 Jan 14, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2456 Description

The Powertrain Control Module (PCM) monitors the rationality of the Diesel Particulate Filter (DPF) pressure sensor during idle and part load operating conditions. The test fails when the diesel particulate filter pressure sensor signal value at idle is less than 0.15 kPa (0.022 psi). The test also fails when the diesel particulate filter pressure sensor signal value at part load is less than a minimum value or greater than a maximum value. These minimum and maximum values are based on the volume of exhaust.

OBDII Code P2456 - Diesel Particulate Filter Pressure Sensor 'A' Circuit Intermittent/Erratic - AutoCodes.com — P2456 Code - Diesel Particulate Filter Pressure Sensor 'A' Circuit Intermittent/Erratic

What does this mean?

What are the Possible Causes of the DTC P2456?

Faulty Diesel Particulate Filter (DPF) Pressure Sensor
Diesel Particulate Filter (DPF) Pressure Sensor harness is open or shorted
Diesel Particulate Filter (DPF) Pressure Sensor circuit poor electrical connection
Diesel particulate filter pressure sensor connecting hose is loose, cracked, or missing
Diesel particulate filter pressure sensor connecting hose port is cracked or broken
Excessive amount of soot or ash in the diesel particulate filter

How to Fix the DTC P2456?

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 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 code?

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

Need Help with the Code?

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

Information for Specific Makes

P2456 Buick — Diesel Particulate Filter Differential Pressure Sensor Circuit Intermittent
P2456 Cadillac — Diesel Particulate Filter Differential Pressure Sensor Circuit Intermittent
P2456 Chevrolet — Diesel Particulate Filter Differential Pressure Sensor Circuit Intermittent
P2456 Dodge — Diesel Particulate Filter Pressure Sensor 'A' Circuit Intermittent/Erratic
P2456 Ford — Diesel Particulate Filter Pressure Sensor 'A' Circuit Intermittent/Erratic
P2456 GMC — Diesel Particulate Filter Differential Pressure Sensor Circuit Intermittent

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 Code

1. What are the common symptoms of OBDII code P2456?

- Common symptoms include reduced engine performance, decreased fuel efficiency, black smoke from the exhaust, and the illumination of the check engine light.

2. What could cause the Diesel Particulate Filter Pressure Sensor 'A' Circuit Intermittent/Erratic code P2456?

- Potential causes may include a faulty pressure sensor, damaged wiring or connectors, a clogged diesel particulate filter, or issues with the diesel particulate filter pressure sensor circuit.

3. How can I diagnose the cause of OBDII code P2456?

- Diagnosis typically involves inspecting the diesel particulate filter pressure sensor and its circuit, checking for any loose connections or damaged wiring, testing the sensor for proper operation, and scanning for other related trouble codes.

4. Can driving with a P2456 fault code cause further damage to the vehicle?

- Continuing to drive with the P2456 fault code may lead to increased emissions, reduced engine efficiency, and potential damage to the diesel particulate filter system over time. It is recommended to address the issue promptly.

5. Is it safe to continue driving my vehicle with the check engine light on due to code P2456?

- While the vehicle may still be operational, it is advisable to have the issue diagnosed and repaired as soon as possible to prevent further complications and ensure optimal performance.

6. How can I repair OBDII code P2456 at home?

- Repairing code P2456 may involve replacing the diesel particulate filter pressure sensor, repairing damaged wiring or connectors, clearing the trouble codes with an OBDII scanner, and testing the vehicle to ensure the issue is resolved.

7. Will resetting the fault codes with an OBDII scanner fix the P2456 code permanently?

- Simply clearing the fault codes without addressing the underlying issue may temporarily turn off the check engine light, but the problem causing code P2456 will likely resurface. It is crucial to diagnose and repair the root cause.

8. Are there any maintenance tips to prevent OBDII code P2456 from occurring?

- Regular maintenance of the diesel particulate filter system, including timely filter replacements and sensor inspections, can help prevent issues like code P2456. Following the manufacturer's recommended service schedule is also essential.

9. Can a DIY enthusiast without much experience fix code P2456?

- While some aspects of diagnosing and repairing code P2456 may be manageable for DIY enthusiasts, dealing with sensor circuits and emissions-related components can be complex. It is recommended to seek professional help if unsure.

10. How long does it typically take to repair OBDII code P2456 at a repair shop?

- The repair time for code P2456 can vary depending on the exact cause of the issue, availability of parts, and the shop's workload. In general, it may take a few hours to a full day to diagnose and repair the problem.