DTC P20EE, P249D, P249E, or P2BAD

Engine Controls and Fuel - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 5906682 Diagnostic Instructions Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions DTC Descriptor P20EE NOx Catalyst Efficiency Below Threshold P249D Closed Loop Reductant Injection Control At Limit - Flow Too Low P249E Closed Loop Reductant Injection Control At Limit - Flow Too High P2BAD Exhaust Nitrogen Oxides Concentration High - Unknown Reason Circuit/System Description For an overview of the component/system, refer to: Exhaust Aftertreatment System Description Conditions for Running the DTC P20EE DTCs related to the following system/component = Not Set A38 Reductant Pump and Sensor Assembly B9 Ambient Air Temperature Sensor B17 Barometric Pressure Sensor B26 Crankshaft Position Sensor B34 Engine Coolant Temperature Sensor B65 Intake Manifold Pressure and Air Temperature Sensor B75C Multifunction Intake Air Sensor B115 Vehicle Speed Sensor B131 Exhaust Temperature Sensor B154 Diesel Particulate Filter Exhaust Differential Pressure Sensor B195 Nitrogen Oxides Sensor B212 Reductant Sensor Module B345R Exhaust Pressure Differential Sensor - Exhaust Gas Recirculation E52 Reductant Line Heater E53 Reductant Tank Heater K20 Engine Control Module K115 Reductant Control Module M103 Turbocharger Vane Position Actuator M122 Exhaust Pressure Control Valve Actuator Q14A Exhaust Gas Recirculation Valve 1 Q14B Exhaust Gas Recirculation Valve 2 Q17 Fuel Injector Q38 Throttle Body Q61 Reductant Injector Fuel Trim System Engine = Running Barometric Pressure = Greater than 70 kPa (10.2 PSI) Ambient Air Temperature = Warmer than −20°C (-4°F) Reductant Tank Status = Not Frozen Particulate Filter Regeneration Status = Filter Regeneration Not Required Frequency the DTC runs = Continuously — After the running conditions are met P249D, P249E Engine = Running Barometric Pressure = Greater than 70 kPa (10.2 PSI) Ambient Air Temperature = Greater than −7°C (19.4°F) P2BAD Engine = Running Reductant Tank Status = Not Frozen Particulate Filter Regeneration Status = Filter Regeneration Not Required Frequency the DTC runs = Continuously — After the running conditions are met Actions Taken When the DTC Sets DTCs listed in the DTC Descriptor category = Type B DTC — Exceptions listed below P20EE = Type A DTC — MIL Illuminated P2BAD = Type C DTC — MIL Illuminated Conditions for Clearing the DTC DTCs listed in the DTC Descriptor category = Type B DTC — Exceptions listed below P20EE = Type A DTC — MIL Illuminated P2BAD = Type C DTC — MIL Illuminated P2BAD = Type C DTC Diagnostic Aids Water in the Reductant tank will cause DTCs to set. Using the Reductant Injector Device Control, a ticking sound should be heard at the reductant injector. Reference Information DTC Type Reference Powertrain Diagnostic Trouble Code (DTC) Type Definitions Scan Tool Reference Control Module References Circuit/System Verification

Verify DTC U029D, U029E is not set. ⇒ If the DTC is set Refer to: Diagnostic Trouble Code (DTC) List - Vehicle ⇓ If the DTC is not set
Verify there are no DTCs set related to the following component/system: A38 Reductant Pump and Sensor Assembly B9 Ambient Air Temperature Sensor B17 Barometric Pressure Sensor B34 Engine Coolant Temperature Sensor B65 Intake Manifold Pressure and Air Temperature Sensor B131 Exhaust Temperature Sensor B154 Diesel Particulate Filter Exhaust Differential Pressure Sensor B195 Nitrogen Oxides Sensor B212 Reductant Sensor Module B345R Exhaust Pressure Differential Sensor - Exhaust Gas Recirculation E52 Reductant Line Heater E53 Reductant Tank Heater K20 Engine Control Module K115 Reductant Control Module M103 Turbocharger Vane Position Actuator M122 Exhaust Pressure Control Valve Actuator Q14A Exhaust Gas Recirculation Valve 1 Q14B Exhaust Gas Recirculation Valve 2 Q17 Fuel Injector Q38 Throttle Body Q61 Reductant Injector ⇒ If a related DTC is set 2.1. Refer to: Diagnostic Trouble Code (DTC) List - Vehicle 2.2. Perform the following procedure/test: Reductant System Malfunction Service Bay Test — Diagnose other DTCs first. . ⇒ If the procedure/test does not pass Refer to: Circuit/System Testing ⇓ If the procedure/test passes All OK. ⇓ If a related DTC is not set
Verify DTC P20EE, P249D, P249E, P2BAD is not set. ⇒ If the DTC is set Refer to: Circuit/System Testing ⇓ If no DTC is set
All OK. Circuit/System Testing
Ignition and Start Signal » Off
Verify the condition does not exist: Contamination — Emission Reduction Fluid » Refer to: Contaminants-in-Diesel Exhaust Fluid Diagnosis ⇒ If a condition exists Repair or replace as necessary ⇓ If no condition exists
Perform the scan tool control function: Reductant System Leak Test Verify the condition does not exist: Hoses / Lines — Leaking ⇒ If a condition exists Repair or replace as necessary ⇓ If no condition exists
Remove the component: Q61 Reductant Injector — Leave the reductant line and the electrical connector connected.
Place the injector into a suitable container.
Perform the scan tool control function: Reductant System Leak Test Verify the condition does not exist: Reductant Injector — Leaking ⇒ If a condition exists Replace the component: Q61 Reductant Injector ⇓ If no condition exists
Perform the scan tool control function: Reductant System Leak Test Verify the scan tool parameter: Reductant Pressure = 450 to 550 kPa (65 to 80 PSI) ⇒ If not between 450 and 550 kPa (65 and 80 PSI) Replace the component: A38 Reductant Pump and Sensor Assembly ⇓ If between 450 and 550 kPa (65 and 80 PSI)
Verify there are no leaks, kinks or restrictions in the reductant lines ⇒ If a condition exists Repair or replace as necessary ⇓ If no condition exists
Perform the scan tool control function: Reductant Fluid Injector Quantity Test. ⇒ If the procedure/test does not pass Repair or replace as necessary ⇓ If the procedure/test passes
Disconnect the electrical connector: Q61 Reductant Fluid Injector
Run the engine at 1,500 RPM for 10 min
NOx sensors at operating temperature, idle engine at 700 RPM until Exhaust Gas Temperature Sensor 1 is colder than 150°C (302°F).
Verify NOx sensor 2 NOx Concentration is less than 50 ppm greater than NOx sensor 1 NOx Concentration. ⇒ If NOx sensor 2 NOx Concentration is 50 ppm or more greater than NOx sensor 1 NOx Concentration Replace the B195B Nitrogen Oxides Sensor 2 ⇓ If NOx sensor 2 NOx Concentration is less than 50 ppm greater than NOx sensor 1 NOx Concentration
Connect the Q61 Reductant Injector electrical connector.
Verify none of the conditions listed below exist: Exhaust system leaks. Refer to Symptoms - Engine Exhaust Leaking fuel injectors. Refer to Cylinder Power Balance Test. Engine oil consumption. Refer to Oil Consumption Diagnosis. Engine coolant consumption. Refer to Coolant in Combustion Chamber. An engine mechanical condition. Refer to Symptoms - Engine Mechanical. Charge air cooler leaks. Refer to Full System Air Test Component/System Leak Test ⇒ If a condition exists Repair as necessary ⇓ If no condition exists
Replace the component: Nitrogen Oxides Catalytic Converter Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Nitrogen Oxides Sensor Replacement - Position 1 Nitrogen Oxides Sensor Replacement - Position 2 Nitrogen Oxides Catalytic Converter Replacement — With Particulate Filter Repair Verification

Perform the scan tool control function: Reductant System Malfunction Service Bay Test. ⇒ If the procedure/test does not pass Refer to: Circuit/System Testing ⇓ If the procedure/test passes
All OK.