P2463
DTC P2463
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions)provides an overview of each diagnostic category.
DTC Descriptor
DTC P2463
- Diesel Particulate Filter Soot Level Accumulation
Circuit/System Description
The particulates in the exhaust gases are collected by the diesel particulate filter (DPF). When the filter becomes saturated with particulates, they are incinerated by a regeneration process. The regeneration process increases the exhaust gas temperature, warming the diesel oxidation catalyst (DOC) first, then warming the DPF. The engine control module (ECM) monitors the system with inputs from two exhaust gas temperature (EGT) sensors 1 and 2 and an exhaust pressure differential sensor.
The ECM will command an active regeneration base on a calculated soot model. The soot model calculations are based on the following information:
* Distance since last DPF regeneration
* Fuel used since last DPF regeneration
* Engine run time since last DPF regeneration
* Exhaust pressure differential sensor values
If soot loading continues to increase it will eventually exceed a calibrated threshold and cause this diagnostic to run and fail.
Conditions for Running the DTC
* The ignition is ON.
* DTC P2463 runs continuously when the above condition is met.
Conditions for Setting the DTC
The ECM detects the DPF soot level is greater than 70 g for greater than 30 seconds.
Action Taken When the DTC Sets
* DTC P2463 is a Type A DTC.
* The ECM commands the engine control system to operate in Reduced Engine Power mode.
* A message center or an indicator may display Reduced Engine Power.
* The DPF regeneration is inhibited.
Conditions for Clearing the MIL/DTC
DTC P2463 is a Type A DTC.
Diagnostic Aids
* Operating the vehicle at slower speeds or stop and go conditions will lower regeneration temperatures. Low regeneration temperatures will not properly clean the DPF and may cause this DTC to set.
* Extended operation of the vehicle with the Clean Exhaust Filter message may cause this DTC to set.
Reference Information
Schematic Reference
Engine Controls Schematics ([1][2]Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector End Views By Name)
Description and Operation
Exhaust Aftertreatment System Description (Emission Control Systems)
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Powertrain Diagnostic Trouble Code (DTC) Type Definitions)
Scan Tool Reference
Control Module References (Programming and Relearning)for scan tool information
Special Tools
* J-23738-A Mityvac
* J-35555 Metal Mityvac
Circuit/System Verification
1. Verify that DTCs P003A, P0047, P0048, P0088, P0101, P0102, P0103, P0201-P0208, P0234, P0263, P0266, P0269, P0272, P0275, P0278, P0281, P0284, P0299, P02E0, P02E2, P02E3, P02E7-P02E9, P02EB, P0300-P0308, P0401, P0402, P046C, P2032, P2033, P2453, 2454, or P2455 are not set.
• If a DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle) for further diagnosis.
2. Engine idling at operating temperature, observe the scan tool Particulate Filt. Pressure Variance parameter. The value should be between 0-3 kPa.
3. Verify the following scan tool parameters:
* Engine Run Time Since Last DPF Regeneration parameter-The value should be less than 17.5 hours.
* Fuel Used Since Last DPF Regeneration parameter-The value should be less than 213 liters (57 gallons).
* Distance Since Last DPF Regeneration parameter-The value should be less than 804 kilometers (500 miles) at sea level, or less than 603 kilometers (375 miles) when equal to or above 10,000 feet altitude.
• If any of the parameters are greater than the specified range, perform a DPF Service Regeneration. Refer to Diesel Particulate Filter (DPF) Service Regeneration (Diesel Particulate Filter (DPF) Service Regeneration).
4. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Verify the following conditions do not exist with the exhaust pressure differential system:
* Modifications
* Damaged components
* Loose or improperly installed components-Ensure the smaller diameter pressure line is connected to the rear of the exhaust particulate filter and to the smaller port of the B154 exhaust pressure differential sensor.
* Improperly routed differential pressure lines-The exhaust differential pressure line should have a continuous downward gradient without any sharp bends or kinks from the sensor to the DPF.
* B154 exhaust pressure differential sensor flexible lines for internal restrictions.
• If a condition is found, repair as necessary
2. Verify the following conditions do not exist:
* Water in fuel contamination-Refer to Contaminants-in-Fuel Diagnosis (Contaminants-In-Fuel Diagnosis).
* Air induction system leaks-Perform the Induction System Smoke Test in Charge Air Cooler Diagnosis Charge Air Cooler Diagnosis.
* A cracked or damaged MAF sensor housing
* A skewed, stuck in range, or slow responding MAF sensor. Inspect the MAF sensor for contamination. Refer to DTC P0101 (P0101).
* Charge air cooler (CAC) leaks-Perform the Full System Air Leak Test and Induction System Smoke Test in Charge Air Cooler Diagnosis Charge Air Cooler Diagnosis.
* A skewed or shifted B154 exhaust pressure differential sensor. A sensor that is skewed will cause inaccuracies in the soot model and may cause this DTC to set. Refer to Component Testing.
* Exhaust system leaks. An exhaust system leak may cause inaccurate B131 exhaust temperature sensor or B154 exhaust pressure differential sensor values causing this DTC to set.
* Improperly installed or loose B131 exhaust gas temperature (EGT) sensors will cause inaccuracies in the soot model and cause this DTC to set.
* Q57 Indirect fuel injector leaking or restricted- (Indirect Fuel Injector Diagnosis)
* Engine mechanical condition, for example low compression. Refer to Symptoms - Engine Mechanical (Symptoms - Engine Mechanical).
• If a condition is found, repair as necessary.
Component Testing
1. Ignition OFF, remove the B154 exhaust pressure differential sensor.
2. Install a 3 A fused jumper wire between the 5 V reference circuit terminal 1 and the corresponding terminal of the B154 exhaust pressure differential sensor. Install a jumper wire between the low reference terminal 3 of the sensor and ground.
3. Connect a DMM between terminal 2 of the B154 exhaust pressure differential sensor and ground.
4. Ignition ON, with the J-23738-A or J-35555 connected to the B154 exhaust pressure differential sensor rear pressure port, slowly apply vacuum to the sensor while monitoring the voltage. The voltage should vary and transition smoothly without any spikes or dropouts.
• If the voltage is erratic, replace the B154 exhaust pressure differential sensor.
• If the sensor tests normal, perform the Diesel Particulate Filter (DPF) Service Regeneration (Diesel Particulate Filter (DPF) Service Regeneration).
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the repair.
* Exhaust Particulate Filter Replacement Service and Repair
* Exhaust Pressure Differential Sensor Pipe Replacement (Exhaust Pressure Differential Sensor Pipe Replacement)
* Exhaust Pressure Differential Sensor Replacement (Exhaust Pressure Differential Sensor Replacement)
* Perform the following scan tool reset procedures:
1. NOx Catalyst Reductant Loading Reset
2. NOx Catalyst Reset
3. DPF/Catalyst 2 Reset
4. Perform the Diesel Particulate Filter (DPF) Service Regeneration (Diesel Particulate Filter (DPF) Service Regeneration) procedure to reset the DPF diagnostic variables.