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P205C




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 Ambient Air Temperature 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, P205C, and P205D are Type B DTCs.

Conditions for Clearing the DTC

DTCs P205B, P205C, and P205D are Type B DTCs.

Reference Information
Schematic Reference

Engine Controls Schematics ([1][2]Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Description and Operation

* Diesel Exhaust Fluid (DEF) Warning Strategy (DEF Level) (Diesel Exhaust Fluid (DEF) Warning Strategy (DEF Level)) Diesel Exhaust Fluid (DEF) Warning Strategy (DEF Quality) (Diesel Exhaust Fluid (DEF) Warning Strategy (DEF Quality)) 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 (Programming and Relearning) 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 425-575 kPa and there should be no leaks in the system.

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.

6. Engine idling 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.