AutoCodes – GMC – P2455 GMC

P2455 GMC Code - Diesel Particulate Filter Differential Pressure Sensor Circuit High Voltage

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: P2455 GMC indicates Diesel Particulate Filter Differential Pressure Sensor Circuit High Voltage.
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.

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Code Popularity 2,832

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jul 28, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2455 GMC 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 open circuit or a short to voltage in the signal circuit.

OBDII Code P2455 GMC - Diesel Particulate Filter Differential Pressure Sensor Circuit High Voltage - AutoCodes.com — P2455 GMC Code - Diesel Particulate Filter Differential Pressure Sensor Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P2455 GMC?

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 P2455 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 P2455 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.

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Need Help with the 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.

Frequently Asked Questions about P2455 GMC Code

What does the OBDII code P2455 mean for my GMC vehicle?

The OBDII code P2455 indicates that there is high voltage detected in the Diesel Particulate Filter (DPF) Differential Pressure Sensor Circuit, which measures the pressure difference across the DPF.

What are the common symptoms of the P2455 code?

Common symptoms may include a check engine light, poor engine performance, increased fuel consumption, and possible excessive exhaust smoke.

What could cause the P2455 code to trigger?

Causes can include a faulty differential pressure sensor, wiring issues (such as shorts or open circuits), or problems with the DPF itself.

How can I diagnose the P2455 code?

You can diagnose the P2455 code by using an OBDII scanner to confirm the code, inspecting the DPF differential pressure sensor and its wiring, and checking for any other related trouble codes.

What are some repair tips for fixing the P2455 code?

Repairs may involve replacing the differential pressure sensor, repairing damaged wiring or connectors, or cleaning or replacing the DPF if it is clogged or damaged.

Is it safe to drive my vehicle with a P2455 code?

While it may be safe to drive at low speeds, it is not recommended to drive long distances or at high speeds as it could lead to further damage to the emissions system.

Can the P2455 code affect my vehicle's emissions?

Yes, the P2455 code can lead to increased emissions due to improper functioning of the DPF system, which is designed to reduce harmful soot emissions from diesel engines.

Will clearing the P2455 code fix the problem?

Clearing the code may turn off the check engine light temporarily, but the underlying issue must be resolved; otherwise, the code will likely reappear.

How much does it typically cost to fix the P2455 code?

Repair costs can vary widely depending on the specific issue, but expect costs to range from $100 to $1,000 or more, especially if the DPF needs to be replaced.