P205B
DTC P205B-P205D
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 P205B
-
Reductant Tank Temperature Sensor Performance
DTC P205C
-
Reductant Tank Temperature Sensor Circuit Low Voltage
DTC P205D
-
Reductant Tank Temperature Sensor Circuit High Voltage
Circuit/System Description
The reductant level/temperature sensor is a solid-state device that provides the engine control module (ECM) with information on reductant level and temperature. The level/temperature sensor receives system voltage directly from the underhood electrical center and ground through a chassis ground circuit. The level sensor consists of three sensing elements. Reductant level sensor 3 is highest, reductant level sensor 2 is located between sensor 1 and 3. Reductant level sensor 1 is located at low reductant level. Reductant level sensor 3 is located at less than half range of the DEF tank level. The scan tool will display Active when the level sensors are in contact with reductant and Inactive when not in contact with reductant. An integrated temperature sensor monitors reductant temperature. Reductant level and temperature signals are processed within the sensor and supplied to the ECM as serial data messages. The ECM will set a DTC when it detects an invalid level or temperature serial data message from the sensor.
Conditions for Running the DTC
* DTC P205D is not set. - for P205B only
* The ignition is OFF for 8 hours.
* The ECM monitors the ECT, EGT 2, and EGT 4 for the coldest and warmest of the three sensors. The difference between the coldest and warmest should be less than 7°C (45°F).
* The engine speed is greater than 600 RPM.
* The battery voltage is greater than 11 V.
* The DTCs run once per drive cycle when the above conditions are met for greater than 20 s.
Conditions for Setting the DTC
P205B
* The ECM receives a serial data message from the reductant sensor module that the reductant temperature is not within -35 to +35°C (-31 to +95°F) of the fuel pump temperature sensor for greater than 3 s.
Or
* The ECM receives a serial data message from the reductant sensor module that the reductant temperature is not within -55 to +155°C (-67 to +311°F) for greater than 3 s.
P205C
The ECM receives a serial data message from the reductant sensor module that the reductant temperature is less than -55°C (-67°F) for greater than 3 s.
P205D
The ECM receives a serial data message from the reductant sensor module that the reductant temperature is greater than 160°C (320°F) for greater than 3 s.
Action Taken When the DTC Sets
* DTCs P205B and P205D are Type B DTCs.
* DTC P205C is a Type A DTC.
Conditions for Clearing the DTC
* DTCs P205B and P205D are Type B DTCs.
* DTC P205C is a Type A DTC.
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 Emission Control Systems
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
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.
2. Ignition ON, observe the scan tool Reductant Temperature. The reading should be warmer than -55°C (-67°F) and colder than 160°C (320°F).
• If not within the specified range, replace the emission reduction fluid tank.
3. Compare the scan tool Ambient Air Temperature to the Reductant Temperature. The readings should be within 35°C (95°F).
• If not within the specified range, replace the emission reduction fluid tank.
4. 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 are captured in the Freeze Fame/Failure Records Data List.
Repair Instructions
* Emission Reduction Fluid Tank Replacement Emission Reduction Fluid Tank Replacement
* Perform the scan tool Reductant System Reset procedure after replacing the emission reduction fluid tank.
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.
Note:
The diesel exhaust fluid (DEF) and ambient air temperatures must be greater than -7°C (19°F) before proceeding with this procedure.
5. Ignition ON, command the Reductant System Leak Test ON with a scan tool. Allow the pressure to build for 30 s. Observe the scan tool Reductant Pressure sensor parameter. The reading should be between 400-600 kPa (58-94 psi) and there should be no leaks in the system.
6. Ignition OFF, all vehicle systems OFF, this may take up to 2 minutes.
7. Engine idling for 30 s.
8. Ignition OFF, all vehicle systems OFF, this may take up to 2 minutes.
9. Ignition ON, perform the Reductant System Data Reset with a scan tool in order to clear the DEF lamp.
• If the DEF lamp does not turn OFF, a condition with the system still exists.