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Tahoe / Yukon Service Manual

DTC P2453

Engine Controls and Fuel - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 5508920 Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. DTC Descriptors Particulate Filter Pressure Sensor Performance Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performanc
5V Reference P0651 P2454 P0651 P2453
Signal P2454 P2455 P2455 P2453
Low Reference — P2455 — P2453

Circuit/System Description The diesel exhaust aftertreatment system consists of an under hood catalyst and an underbody catalyst. The underbody catalyst 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 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 (1,112°F) and the accumulated soot is oxidized or burned off into carbon dioxide (CO2). Conditions for Running the DTC DTCs related to the following system/component = Not Set – B75C Multifunction Intake Air Sensor – B131 Exhaust Temperature Sensor No other DTCs related to the concerned component are set. Ignition = On Ignition and Start Switch Signal = Greater than 11 V Frequency the DTC runs = Continuously — After the running conditions are met Conditions for Setting the DTC DPF Differential Pressure = Not within a calibrated range — For greater than 1 s Action Taken When the DTC Sets DTC P2453 is a Type B DTC. Conditions for Clearing the DTC DTC P2453 is a Type B DTC. Reference Information Schematic Reference Engine Controls Schematics Connector End View Reference Master Electrical Component List Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs DTC Type Reference Powertrain Diagnostic Trouble Code (DTC) Type Definitions Scan Tool Reference Control Module References for scan tool information Circuit/System Verification

  1. Ignition » On / Vehicle » In Service Mode
  2. Verify there are no DTCs set related to the following component/system: B75C Multifunction Intake Air Sensor B131 Exhaust Temperature Sensor ⇒ If a related DTC is set Refer to Diagnostic Trouble Code (DTC) List - Vehicle ⇓ If a related DTC is not set
  3. Engine idling.
  4. Verify the scan tool DPF differential pressure parameter is within 0–10 kPa (0–1.5 PSI). ⇒ If not within 0–10 kPa (0–1.5 PSI) Refer to Circuit/System Testing. ⇓ If within 0–10 kPa (0–1.5 PSI)
  5. 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.
  6. Verify that the DTC is not set. ⇒ If the DTC sets Refer to Circuit/System Testing. ⇓ If the DTC does not set
  7. All OK. Circuit/System Testing
  8. Verify the following conditions do not exist: Exhaust System — Leaking / Missing components / Visible Damage Particulate Filter Differential Pressure — Hoses / Lines — Kinked / Leaking / Restricted / Visible Damage ⇒ If a condition exists » Repair or replace as necessary ⇓ If no condition exists
  9. Ignition OFF, disconnect the harness connector at the B354P Diesel Particulate Filter Exhaust Differential Pressure Sensor.
  10. Test for less than 10 Ω between the low reference circuit terminal 3 and ground. ⇒ If 10 Ω or greater 3.1. Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module. 3.2. Test for less than 2 Ω in the low reference circuit end to end. ⇒ If 2 Ω or greater, repair the open/high resistance in the circuit. ⇒ If less than 2 Ω, replace the K20 Engine Control Module. ⇓ If less than 10 Ω
  11. Ignition ON, test for 4.8–5.2 V between the 5 V reference circuit terminal 1 and ground. ⇒ If less than 4.8 V 4.1. Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module. 4.2. Test for infinite resistance between the 5 V reference circuit and ground. ⇒ If less than infinite resistance, repair the short to ground in the circuit. ⇓ If infinite resistance 4.3. Test for less than 2 Ω in the 5 V reference circuit end to end. ⇒ If 2 Ω or greater, repair the open/high resistance in the circuit. ⇒ If less than 2 Ω, replace the K20 Engine Control Module. ⇒ If greater than 5.2 V 4.1. Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module. 4.2. Test for less than 1 V in the 5 V reference circuit end to end. ⇒ If 1 V or greater, repair the short to voltage in the circuit. ⇒ If less than 1 V, replace the K20 Engine Control Module. ⇓ If between 4.8–5.2 V
  12. Verify the scan tool Diesel Particulate Filter Differential Pressure Sensor parameter is greater than 4.8 V. ⇒ If 4.8 V or less 5.1. Ignition OFF, disconnect the X2 harness connector at the K20 Engine Control Module. 5.2. 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, replace the K20 Engine Control Module. ⇓ If greater than 4.8 V
  13. Install a 1 A fused jumper wire between the signal circuit terminal 2 and ground. Verify the scan tool Diesel Particulate Filter differential pressure sensor parameter is less than 0.5 V. ⇒ If 0.5 V or greater 6.1. Ignition OFF, disconnect the X2 harness connector at the K20 Engine Control Module. 6.2. Test for less than 1 V in the signal circuit end to end. ⇒ If 1 V or greater, repair the short to voltage in the circuit. ⇓ If less than 1 V 6.3. Test for less than 2 Ω in the signal circuit end to end. ⇒ If 2 Ω or greater, repair the open/high resistance in the circuit. ⇒ If less than 2 Ω, replace the K20 Engine Control Module. ⇓ If less than 0.5 V Replace the B354P Diesel Particulate Filter Exhaust Differential Pressure Sensor. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair. Exhaust Pressure Sensor Pipe Replacement - Nitrogen Oxides Catalytic Converter Perform the scan tool DPF Pressure Sensor Reset after replacing the exhaust pressure differential sensor. Control Module References for engine control module replacement, programming, and setup.