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P2454




DTC P2454 or P2455

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 Descriptors

DTC P2454
- Diesel Particulate Filter Differential Pressure Sensor Circuit Low Voltage

DTC P2455
- Diesel Particulate Filter Differential Pressure Sensor Circuit High Voltage

Diagnostic Fault Information






Typical Scan Tool Data






Circuit/System Description

The exhaust pressure differential sensor measures the pressure difference across the inlet and outlet of the diesel particulate filter (DPF). The pressure difference across the DPF increases as captured particulates in the DPF increases. A diaphragm within the exhaust pressure differential sensor is displaced by the pressures change that occur from particulate matter loading. The engine control module (ECM) supplies a 5 V reference circuit and a ground on the low reference circuit. The exhaust pressure differential sensor provides a signal voltage to the ECM, relative to the back pressure as a function of exhaust flow, DPF temperature, and DPF soot loading. The ECM converts the signal voltage input to a pressure value.

Conditions for Running the DTC

P2454

* DTC P2455 is not set.

* The engine run time is greater than 10 s.

* The engine speed is greater than 600 RPM.

* The battery voltage is greater than 11 V.

* The DTC runs continuously when the above conditions are met.

P2455

* DTC P2454 is not set.

* The engine run time is greater than 10 s.

* The engine speed is greater than 600 RPM.

* The battery voltage is greater than 11 V.

* The DTC runs continuously when the above conditions are met.

Conditions for Setting the DTC

P2454

The ECM detects that the exhaust pressure differential sensor voltage is less than 0.83 V for 3 s.

P2455

The ECM detects that the exhaust pressure differential sensor voltage is greater than 4.6 V for 3 s.

Action Taken When the DTC Sets

DTCs P2454 and P2455 are Type B DTCs.

Conditions for Clearing the DTC

DTCs P2454 and P2455 are Type B DTCs.

Diagnostic Aids

* Inspect the exhaust pressure differential sensor terminals for corrosion.

* Inspect the harness connector terminals for proper tension.

Reference Information

Schematic Reference

Engine Controls Schematics [1][2]Electrical Diagrams

Connector End View Reference

Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)

Description and Operation

Exhaust Aftertreatment System Description Exhaust Aftertreatment System Description

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 Control Module References for scan tool information

Special Tools

* J-23738-A - Mityvac

* J-35555 - Metal Mityvac

Circuit/System Verification

1. Ignition ON.

2. Verify DTC P0641 or P0651 is not set.

• If any of the DTCs are set
Refer to DTC P0641, P0651, P0697, P06A3, P06D2, or P06D6 P0641

• If none of the DTCs are set

3. Verify the integrity of entire DPF system by inspecting for the following conditions:

* Damaged components

* Loose or improper installation

* Incorrect differential pressure line routing

* Leaks or restrictions in the B154 exhaust pressure differential sensor lines or hoses. The pressure lines should have a continuous downward gradient, without sharp bends, or kinks from the pressure sensor to the exhaust filter assembly.

• If a condition is found
Repair as necessary

• If no condition is found

4. Observe the scan tool Particulate Filter Pressure Variance parameter. The value should be between -1.0 kPa to +0.3 kPa.

• If not between -1.0 kPa to +0.3 kPa (-0.15 psi to +0.044 psi)
Refer to Circuit/System Testing

• If between -1.0 kPa to +0.3 kPa (-0.15 psi to +0.044 psi)

5. Engine running at a warm stabilized idle, observe the scan tool Particulate Filter Pressure Variance parameter. The value should be between 0-3 kPa.

• If not between -1.0 kPa to + 0.3 kPa (-0.15 psi to +0.44 psi)
Refer to Circuit/System Testing

• If between -1.0 kPa to +0.3 kPa (-0.15 psi to +0.44 psi)

6. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

7. verify a DTC does not reset.

• If any DTC sets
Refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.

• If no DTCs set

8. All OK.

Circuit/System Testing

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B154 exhaust pressure differential sensor. It may take up to 2 minutes for all vehicle systems to power down.

2. Test for less than 5 ohms between the low reference circuit terminal 1 and ground.

• If 5 ohms or greater

1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.

2. Test for less than 2 ohms in the low reference circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K20 Engine Control Module.

• If less than 5 ohms

3. Ignition ON.

4. Test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground.

• If less than 4.8 V

1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.

2. Test for infinite resistance between the 5 V reference circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance

3. Test for less than 2 ohms in the 5 V reference circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K20 Engine Control Module.

• If greater than 5.2 V

1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON.

2. Test for less than 1 V between the 5 V reference circuit and ground.

• If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V, replace the K20 Engine Control Module.

• If between 4.8-5.2 V

5. Verify the scan tool DPF pressure sensor parameter is greater than 4.8 V.

• If less than 4.8 V

1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.

2. Test for infinite resistance between the signal circuit terminal 2 and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance

3. Test for less than 2 ohms in the signal circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K20 Engine Control Module.

• If greater than 4.8 V

6. Verify the scan tool DPF Pressure Sensor parameter is less than 0.20 V.

• If 0.2 V or greater

1. Ignition OFF, disconnect the harness connector at the K20 engine control module.

2. Ignition ON.

3. Test for less than 1 V between the signal circuit and ground.

• If 1 V or greater, repair the short to voltage in the circuit

• If less than 1 V

4. Ignition OFF.

5. Test for less than 2 ohms in the signal circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K20 engine control module.

• If less than 0.2 V

7. If all circuits and the B154 exhaust pressure differential sensor lines test normal, test or replace the B154 exhaust pressure differential sensor.

Component Testing

Note: You must perform the Circuit/System Testing in order to verify the integrity of the B154 Exhaust Pressure Differential Sensor circuits before proceeding with Component Testing.

1. Ignition OFF.

2. Remove the B154 Exhaust Pressure Differential Sensor.

3. Install a 3 A fused jumper wire between the 5 V reference circuit terminal 3 and the corresponding terminal of the B154 Exhaust Pressure Differential Sensor.

4. Install a jumper wire between the low reference circuit terminal 1 of the B154 Exhaust Pressure Differential Sensor and ground.

5. Connect a DMM between terminal 2 of the B154 Exhaust Pressure Differential Sensor and ground.

6. Ignition ON, with the J-23738-A - Mityvac or J-35555 - Metal Mityvac connected to the B154 Exhaust Pressure Differential Sensor rear pressure port, slowly apply vacuum while monitoring the voltage on the DMM. The voltage should vary and transition smoothly without any spikes or dropouts.

• If the voltage does not vary or transition smoothly
Replace the B154 Exhaust Pressure Differential Sensor.

• If the voltage varies and transitions smoothly

7. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Exhaust Pressure Differential Sensor Pipe Replacement Exhaust Pressure Differential Sensor Pipe Replacement

* Exhaust Pressure Differential Sensor Replacement Exhaust Pressure Differential Sensor Replacement

* Perform the scan tool Diesel Particulate Filter (DPF) Regeneration Enable Diesel Particulate Filter (DPF) Regeneration Enable procedure if the scan tool DPF Soot Mass is less than 30 g. If the scan tool DPF Soot Mass is 30 g or greater, perform the Diesel Particulate Filter (DPF) Service Regeneration Diesel Particulate Filter (DPF) Service Regeneration procedure.

* Control Module References Control Module References for ECM replacement, programming, and setup

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