CBR 2190-10 202601 Service Bulletin/Repair Instructions

1/30/26, 8:14 AM
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Article
Preview Solution CBR-2190-10

Volvo DEF Level (UQLS) Sensor

Troubleshooting Guide - US17+OBD16

Emissions and US22+OBD23 (DOES NOT

APPLY TO VN(4))

Published 7 January 2026
Valid for

Volvo chassis - all models

Model year - 2018 to current.
NOTE: THIS CBR DOES NOT APPLY TO VN(4)
Overview
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DEF Sensor
The Urea Quality Level Sensor (UQLS) is a smart sensor that is located in the top of the

Urea (DEF) Tank, commonly referred to as the DEF Level Sensor or Combined Tank Unit.

This smart sensor has Urea Quality, Level, and Temperature all integrated into it as one unit

and reports on the DL7 (J1939-7) Datalink. This sensor is responsible for sending all the

urea information to the Aftertreatment Control Module (ACM) and Engine Control Module

(ECM).
Updated UQLS Functions

Basic definition

The SSI sensor measures level as well as concentration by means of ultrasonic waves.

The Urea Quality Level Sensor (UQLS) communicates on Controller Area Network

(CAN) and is connected to EngineSubnet. The sensor will support automatic baud rate

detection (250/500 kbps).
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Level measurement

Level measurement works by bouncing ultrasonic waves towards the liquid level. The

sensors report level in mm where 0 is defined as bottom of the focus tube (offset values

can be used for specific part number, e.g NA aftermarket sensors). However, some

urea above the piezoelectric sensor technology (PZT) is needed in order for the

sensor to detect a level, definition is therefore that 20 mm is the lowest level where the

sensor can reliably measure. If the sensor can't detect urea level it will output an error.

Based on tank geometry and dataset steered by vehicle variant specification, the mm

value from the sensor is converted to urea mass and tank fill percentage.
Quality measurement

Urea quality (concentration) is measured by bouncing ultrasonic waves between the

PZT in the toe of the sensor towards a reflector. By knowing the distance and

temperature the urea concentration is derived from the speed of sound waves in the

liquid.
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Temperature measurement
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Temperature is measured on two locations on the Printed Circuit Board (PCB).

Component list
NOTE: The UQLS cannot be ordered in separate parts; it must be purchased as a

complete sensor. Refer to impact for details.
Diagnosis and Repair

Perform a DTC Readout and Review Codes

If any of the codes in yellow below appear on the Readout in Active or Confirmed

status: Continue to the diagnostic steps in the following section.

DTC
DTC Description
P205B64
Reductant Tank Temperature Sensor, Circuit

Range/Performance
P203A13
Reductant Level Sensor "A", Open Circuit
P203C00

P206A13
Aftertreatment Reagent Level, Short Circuit Low

Reductant Quality Sensor, Open Circuit
P206C00

P206B64
Reductant Quality Sensor, Short Circuit Low

Reductant Quality Sensor Range/Performance
P205A13
Reductant Tank Temperature Sensor, Open Circuit
P205C00
Aftertreatment Reagent Tank Temperature, Short Circuit Low

Aftertreatment Reagent Tank Temperature Sensor Stuck, Signal

plausibility failure
P204364
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DO NOT REPLACE the DEF Level Sensor for any of the codes in green below: DO

NOT proceed with the diagnostics steps in this solution. None of these codes immediately
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indicate a failed DEF Level Sensor. Use the table in conjunction with PTT’s Guided

Diagnostics to find the root cause.

DTC
DTC Description
P203F00
Reductant Level Low
P203B00
Aftertreatment Reagent Level

Warning
System fault. Follow Guided Diagnostics.
U02A200
Lost Communication with

Reductant

Quality Module
Commonly a wiring harness or connection issue.
P24FF00

P207F00
Probable Source

Commonly low DEF quantity or

level sensor float in DEF tank stuck
Reductant Temperature Too DEF tank temp above 70°C (160°F). Commonly the coolant line

High

to the DEF tank are swapped.

Reductant Quality
DEF quality low and SCR efficiency low. Commonly a DEF

quality issue.
Diagnostic Steps For Yellow Codes

1. Check the sensor wiring harness connection.

• Disconnect the harness and make sure there is no damage to the wires or pins,

corrosion, or water ingress in either of the connectors. If damage is found replace

in accordance with Technical Service Bulletin 258-040 - Aftertreatment Diesel

Exhaust Fluid (DEF) Tank, Level Sensor, Replacement. Located in Impact.

1. Navigate to the Service tab.

2. In the Info Type box, make sure Technical Service Bulletins is selected.

3. In the Additional search values box select Keyword

4. Enter 258-040 into the text entry box, press the Search button.

5. A link for the article will be shown in the results. Click on the title, then choose

one of the options from the window that opens.
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2. Verify the DEF quality is at an acceptable value.

• Use refractometer part number 88890105 to verify the DEF quality. See

illustration below.
3. Verify that the DEF tank is not frozen.

4. Ensure that the DEF tank is adequately filled.

5. Clear the Fault Codes.

6. Start the engine. Run the engine on high idle for 2 minutes at 1000 rpm or higher.
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7. Turn the Engine Off, Key Off for 15 seconds.
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8. Start the engine. Run the engine on high idle for 2 minutes a second time.
Evaluate the Results

If any of the faults shown in the yellow chart above return active: Replace the DEF

Level Sensor in accordance with Impact instructions and the wires routed as shown in

Technical Service Bulletin 258-040.

If none of the faults in the yellow chart above return: No troubleshooting or

replacement of the DEF Level Sensor is necessary.
Rules for Replacement

• In order for a repair to be eligible for warranty coverage, one of the diagnostic trouble

codes (DTCs) listed above must be present. However, in rare cases where there is a

potential failure but no DTCs are detected, please provide supporting evidence of the

failure. This can be in the form of a photo or video, along with an explanation for the need of

replacement. This evidence will be used to determine if the repair qualifies for warranty

coverage. For any additional support with diagnostics, open an e-Service case.

• Standard Diagnostic Time for a DEF Level Sensor is 0.6 hrs.
Related links and attachments

FSB 258-040
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