Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2019EXPRESS 2500 BASE, VAN CARGO EXTENDED, 6.0L ENG VIN GREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 20 (ENGINE CONTROLS AND FUEL - 2.8L (LWN) DIESEL - DIAGNOSTIC INFORMATION AND PROCEDURES (3 OF 3))DIAGNOSTIC INFORMATION AND PROCEDURESDTC P244ACIRCUIT/SYSTEM TESTING
2019 Chevrolet Express 2500 Base, Van Cargo Extended, 6.0L Eng VIN G
Circuit/System Testing
2019 Chevrolet Express 2500 Base, Van Cargo Extended, 6.0L Eng VIN GSECTION Circuit/System Testing
WARNING: This page is about a different variant/trim than selected.
- Verify the integrity of the DPF system by visually and physically inspecting any of the following conditions:
- Any damaged exhaust system components
- Loose or improperly installed exhaust system components.
- Restrictions in the exhaust differential pressure sensor ports.
- Damaged, bent, restricted, or kinked exhaust differential pressure lines.
- If a condition is found
Repair as necessary.
- Go to next step: If no condition is found
- Remove and inspect the flexible part of the exhaust differential pressure lines for internal restrictions.
- If any restrictions are found
Repair as necessary.
- Go to next step: If no restrictions are found
- If any restrictions are found
- Connect the EN 23738 - A vacuum gauge to port two (rear of particulate filter) of the B154 Diesel Particulate Filter Exhaust Differential Pressure Sensor.
- Ignition ON, using the EN 23738 - A vacuum gauge, slowly apply -10 kPa (3 in Hg) vacuum to the sensor while observing the DPF Differential Pressure parameter.
- Verify the parameter increases smoothly without spikes or dropouts.
- If the parameter does not increase smoothly
Replace the B154 Diesel Particulate Filter Exhaust Differential Pressure Sensor.
- Go to next step: If the parameter increases smoothly
- If the parameter does not increase smoothly
- Replace the Diesel Particulate Filter.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.