P11CC
DTC P11CB-P11CD, P11DB, P11DC, P2201, or P229F
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 P11CB
- NOx Sensor 1 Performance - Signal High
DTC P11CC
- NOx Sensor 1 Performance - Signal Low
DTC P11DB
- NOx Sensor 1 Current Performance
DTC P11DC
- NOx Sensor 2 Current Performance
DTC P2201
- NOx Sensor 1 Performance
DTC P229F
- NOx Sensor 2 Performance
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
P11CB or P11CC
* DTCs P0101, P0234, P0299, P0401, P0402, P140B, P140C, P2228, or P2229 are not set.
* The DPF Regeneration is not active.
* The BARO is between 75-106 kPa (11-15 psi).
* The ambient air temperature is between -7 to +38°C (19-100°F).
* The engine run time is greater than 30 s.
* The engine coolant temperature is between -7 to +123°C (19-253°F).
* The engine speed is greater than 600 RPM.
* The battery voltage is greater than 11 V.
* The NOx sensor is at operating temperature.
* The DTCs run once per drive cycle when the above conditions are met.
P11DB
* DTCs P064C, P163C, P2200, P2205, P220A, P220B, U029D and U029E are not set.
* The exhaust gas temperature (EGT) sensor 2 is greater than 95°C (203° F).
* The engine speed is greater than 600 RPM.
* The battery voltage is greater than 11 V.
* The DPF regeneration is not active.
* The DTCs run continuously when the above conditions are met.
P11DC
* The EGT sensor 4 is greater than 95°C (203°F).
* The engine speed is greater than 600 RPM.
* The battery voltage is greater than 11 V.
* The DPF regeneration is not active.
* The DTC runs continuously when the above conditions are met.
P2201
* 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 DPF regeneration is not active.
* The DTC runs continuously when the above conditions are met.
P229F
* The ambient air temperature is greater than -7°C (19°F)
* The BARO pressure is greater than 75 kPa (11 psi).
* The EGT sensor 3 is greater than 250°C (482° F).
* The DPF regeneration is not active.
* NOx 1 NOx Concentration and NOx 2 NOx Concentration are greater than 0 ppm.
* The DTC runs when the above conditions are met.
Conditions for Setting the DTC
P11CB or P11CC
The ECM receives a serial data message from the NOx Sensor Module that the NOx concentration disagrees with the calculated NOx concentration for greater than 5 s.
P11DB or P11DC
The ECM receives a serial data message from the NOx Sensor Module that the NOx ratio of valid to invalid feedback is greater than a predetermined amount for greater than 5 s.
P2201
The ECM receives a serial data message from the NOx Sensor Module that the time it takes for the NOx concentration level to fall from 70% to 40% of the initial NOx concentration value is greater than 2 s.
P229F
The ECM receives a serial data message of NOx concentration from NOx Sensor 1 and NOx Sensor 2. During the test phase, the delta NOx concentration at NOx sensor 2 is calculated. If the delta is less than 5 ppm, the diagnostic fails. The test phase begins during a tip-in acceleration event when the conditions for running the DTC are satisfied and completes in approximately 10 s.
Action Taken When the DTC Sets
DTCs P11CB, P11CC, P11DB, P11DC, P2201, and P229F are Type B DTCs.
Conditions for Clearing the DTC
DTCs P11CB, P11CC, P11DB, P11DC, P2201, and P229F are Type B DTCs.
Diagnostic Aids
In order for the NOx 1 NOx Concentration and NOx 2 NOx Concentration to indicate greater than 0 ppm, the vehicle must be driven until the EGT sensor 3 is greater than 250°C (482°F).
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)
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 for further diagnosis.
• If no DTC is set
2. Verify the following conditions do not exist with the exhaust system:
* Leaks - Refer to Exhaust Leakage Exhaust Leakage
* 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 exhaust system.
• If no condition is found
3. Verify NOx 1 NOx Concentration and NOx 2 NOx Concentration are greater than 0 ppm.
4. Accelerate vehicle to 80 km/h (50 mph) then decel 48 km/h (30 mph).
5. Perform a hard accel to 80 km/h (50 mph.) Continue accel and decel procedure until the DTC passes or fails on this key cycle.
• If the DTC fails
Replace the B195 NOx sensor - position 2.
• If the DTC passes
6. 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
* Perform the scan tool NOx Sensor 1 or 2 Reset procedure after replacing the NOx sensor 1 or 2.
* Perform the Diesel Particulate Filter (DPF) Regeneration Enable Diesel Particulate Filter (DPF) Regeneration Enable after replacing the NOx sensor 1
* Control Module References Control Module References for engine control module replacement, programming, and setup
Repair Verification
1. Install any components or connectors that have been removed or replaced during diagnosis.
2. Perform any adjustment, programming, or setup procedures that are required when a component or module is removed or replaced.
3. Clear the DTCs.
4. Ignition OFF, all vehicle systems OFF, this may take up to 2 minutes.
Warning
Road test a vehicle under safe conditions and while obeying all traffic laws. Do not attempt any maneuvers that could jeopardize vehicle control. Failure to adhere to these precautions could lead to serious personal injury and vehicle damage.
5. In order to clear the DEF lamp, idle the engine at operating temperature. Accelerate at part throttle to 32-48 km/h (20-30 mph) for up to 5 minutes or until the DEF lamp turns OFF. The DEF lamp should turn OFF.
• If the DEF lamp does not turn OFF, a condition with the system still exists.