P2203
DTC P2200, P2202, P2203, P229E, P22A0, or P22A1
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 P2200
- NOx Sensor 1 Circuit
DTC P229E
- NOx Sensor 2 Circuit
DTC P2202
- NOx Sensor 1 Circuit Low Voltage
DTC P2203
- NOx Sensor 1 Circuit High Voltage
DTC P22A0
- NOx Sensor 2 Circuit Low Voltage
DTC P22A1
- NOx Sensor 2 Circuit High Voltage
Diagnostic Fault Information
Circuit/System Description
The reductant system uses two nitrogen oxide (NOx) sensors to monitor the amount of NOx in the engine's exhaust gas. The first sensor is located at the outlet of the turbocharger and monitors the engine out NOx level. The second NOx sensor is located between the selective catalytic reduction (SCR) and the diesel particulate filter (DPF) and monitors NOx levels downstream of the SCR. The second NOx sensor also provides the engine control module (ECM) with information on the exhaust oxygen level during DPF regeneration.
Each NOx sensor contains a sensing cell, a pumping cell, and a heater. A sample of exhaust gas passes through a diffusion gap between the sensing cell and the pumping cell. The NOx sensor maintains a constant reference voltage across the sensing cell. An electronic circuit within sensor controls the pump current through the pumping cell in order to maintain a constant voltage in the sensing cell. The amount of current required to maintain the reference voltage in the sensing cell is proportional to the concentration of NOx in the exhaust.
The ECM varies the amount of diesel exhaust fluid (DEF) or reductant added by varying the reductant injector duty cycle in response to changes in engine exhaust out NOx levels.
The smart NOx sensors consist of two components, the NOx module and the NOx sensor element that are serviced as a unit. A circuit or performance condition with a NOx sensor is detected by the NOx sensor module. The smart NOx sensor module communicates the condition to the ECM over the serial data line. The ECM sets a DTC when a serial data message is received from the NOx sensor module.
Conditions for Running the DTCs
P2200
* DTCs P2205, P2209, P22A3, or P22A7 are not set.
* The battery voltage is greater than 11 V.
* The engine speed is greater than 600 RPM.
* The engine run time is greater than 20 s.
* The exhaust gas temperature Sensor 1 is greater than 95°C (203°F).
* The NOx sensor is at operating temperature.
* The DTCs run continuously once the above conditions are met.
P2202, P2203, P22A0, and P22A1
* DTCs P2205, P2209, P22A3, or P22A7 are not set.
* The battery voltage is greater than 11 V.
* The engine speed is greater than 600 RPM.
* The engine run time is greater than 20 s.
* The exhaust gas temperature Sensor 1is greater than 95°C (203°F).
* The NOx sensor is at operating temperature for greater than 10 minutes.
* The DTCs run continuously once the above conditions are met.
P229E
* DTCs P2205, P2209, P22A3, or P22A7 are not set.
* The battery voltage is greater than 11 V.
* The engine speed is greater than 600 RPM.
* The engine run time is greater than 20 s.
* The exhaust gas temperature sensor 3 is greater than 95°C (203°F).
* The NOx sensor is at operating temperature.
* The DTCs run continuously once the above conditions are met.
Conditions for Setting the DTC
P2200 or P229E
The ECM receives a NOx sensor module serial data message indicating an open signal circuit for greater than 3 s.
DTC P2202 or P22A0
The ECM receives NOx sensor module serial data message indicating a NOx concentration is less than -90 ppm for greater than 3 s.
DTC P2203 or P22A1
The ECM receives NOx sensor module serial data message indicating a NOx concentration is greater than 2500 ppm for greater than 3 s.
Action Taken When the DTC Sets
* DTCs P2202, P2203, P22A0, and P22A1 are Type B DTCs.
* DTC P2200 and P229E are Type A DTCs.
Conditions for Clearing the DTC
* DTCs P2202, P2203, P22A0, and P22A1 are Type B DTCs.
* DTC P2200 and P229E are Type A DTCs.
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
* Diesel Exhaust Fluid (DEF) Warning Strategy (DEF Quality) Diesel Exhaust Fluid (DEF) Warning Strategy (DEF Quality)Diesel Exhaust Fluid (DEF) Warning Strategy (DEF Level) Diesel Exhaust Fluid (DEF) Warning Strategy (DEF Level)Diesel Exhaust Fluid (DEF) Warning Strategy (Emission Control) Diesel Exhaust Fluid (DEF) Warning Strategy (Emission Control)Diesel Exhaust Fluid (DEF) Warning Strategy (Anti-Tampering) Diesel Exhaust Fluid (DEF) Warning Strategy (Anti-Tampering)
* 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
Circuit/System Verification
1. Ignition ON, observe the DTC information with a scan tool. DTC UXXXX should not be set.
• If a DTC is set
Refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle
• If no DTC is set
2. Verify the following conditions do not exist:
* Intake system leaks-Refer to Charge Air Cooler Diagnosis (Full System Air Leak Test) Charge Air Cooler Diagnosis (Full System Air Leak Test)Charge Air Cooler Diagnosis (Induction System Smoke Test) Charge Air Cooler Diagnosis (Induction System Smoke Test)
* Exhaust system leaks - Refer to Exhaust Leakage Testing and Inspection
* A loose or disconnected charge air cooler hose or pipe
* Physical damage
* Soot plugged B195 NOx sensor
* Loose or missing hardware
* Loose B195 NOx sensors or B131 exhaust temperature sensors
• If a condition is found
Repair the intake or exhaust system.
• If no condition is found
Replace the faulty B195 NOx sensor.
3. 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.
4. Verify a DTC does not set.
• If any DTC sets
Refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle
• If a DTCs does not set
5. All OK.
Repair Instructions
* Nitrogen Oxide Sensor Replacement - Position 1 Nitrogen Oxide Sensor Replacement - Position 1
* Nitrogen Oxide Sensor Replacement - Position 2 Nitrogen Oxide Sensor Replacement - Position 2
Repair Verification
1. Install any components or connectors that have been removed or replaced during diagnosis.
2. Perform the scan tool NOx Sensor 1 or 2 Reset procedure after replacing the NOx sensor 1 or 2.
3. Clear the DTCs.
4. Ignition OFF, all vehicle systems OFF, this may take up to 2 minutes.
5. In order to clear the DEF lamp, perform the Reductant Fluid Quality Test (With or without DTCs) Component Tests and General Diagnostics. The DEF lamp should turn OFF once the test is finished.
• If the DEF lamp does not turn OFF, a condition with the system still exists.
6. Perform the Reductant System Malfunction Warning Test Component Tests and General Diagnostics with a scan tool in order to clear the Service Emission System message, if illuminated.
• If the Service Emission System message does not turn OFF, a condition with the system still exists.
7. Perform the Diesel Particulate Filter (DPF) Regeneration Enable