KC-2116

6/30/22, 11:05 AM
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NOx Sensor Troubleshooting Guide - US10+OBD13
And Newer Emissions
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Component Overview
There are two Nitrogen Oxide (NOx) sensors in the Exhaust Aftertreatment
System, an INLET and OUTLET. They are smart sensors reporting on the
DL7 (J1939-7) data link and they measure the INLET (Pre SCR) and
OUTLET (Post SCR) of NOx. The NOx sensors have unique CAN
identification numbers and cannot be swapped. Additionally these sensors
are not operational until the exhaust is up to operating temperature and free
of moisture. The Engine Control Module compares the INLET and OUTLET
NOx readings to evaluate the efficiency of the SCR.
The primary failure mode the NOx Sensors is internal failure, which will
generate a sensor specific fault code.
Diagnosis and Repair
Review the tables below to determine which category the Fault Code
currently being diagnosed falls under. Proceed according to the instructions
for the appropriate section.
INLET NOx Sensor (NOx 1) Diagnostic Trouble Codes - Sensor Failure
REPLACE the sensor if any codes in red below are active and/or
confirmed. Do not replace for inactive codes.
Fault
Code
Fault Description
NOx Sensor Performance - Sensing Element Bank 1 Sensor 1,
Performance or Incorrect Operation
NOx Sensor Heater Control Circuit Range/Performance (Bank 1
P220E-93
Sensor 1), No operation
P22FB-92
P2200-13
P2203-00
P2205-13
P2206-00
NOx Sensor Bank 1 Sensor 1, Circuit Open
NOx Sensor Circuit High Bank 1 Sensor 1
NOx Sensor Gas Outlet Open Circuit, Circuit open
NOx sensor heater control circuit low, bank 1 sensor 1
P2208-00
NOx sensor heater sense circuit, bank 1 sensor 1
; Live UI
Direction/Repair: Replace the sensor in accordance with Impact
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instructions.
Do NOT Cut the sensor wiring harness, all NOX sensors are currently on
mandatory return.
Inlet NOx Sensor (NOx 1) Diagnostic Trouble Codes - Potential Sensor
Failure
These codes in yellow below indicate that the inlet NOx sensor is potentially
damaged, but further investigation is required to verify sensor condition.
Fault Code
Fault Description
P026C-00
Fuel Injection Quantity Lower Than Expected
P026D-00
Fuel Injection Quantity Higher Than Expected
P2201-64
NOx Sensor Bank 1 Sensor 1, Signal plausibility failure
P225C-00 NOx Sensor Performance - Signal Stuck High Bank 1 Sensor 1
Direction: Run the applicable PTT Operation per OBD Level.
Emission
Level
OBD 1316
OBD 1718 VGT
Only
OBD 1718 TC
Only
PTT Operation
2549-08-03-03 Nox Conversion Test
2589-08-03-18 Exhaust Aftertreatment System Analysts (make
sure Nox Subtest is selected)
No test… Replace INLET (Nox 1) Nox Sensors if not replaced
within past 3 months and release truck. If Nox sensor has been
replaced within past 3 months open an E-Service Case.
2549-08-03-03 Nox Conversion Test
OBD 19
and
OR (whichever is available)
Newer VGT
Only
2589-08-03-18 Exhaust Aftertreatment System Analysts (only
Nox Subtest available)
OBD 19
and
2549-08-03-03 Nox Conversion Test
Newer TC
Only
; Live UI
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Repair:
• If the INLET (NOx1) sensor fails the evaluation, replace the Inlet NOx
Sensor ONLY.
• If the NOx2 sensor (Outlet NOx Sensor) fails the test, disregard the
results.
OUTLET NOx Sensor (NOx 2) Diagnostic Trouble Codes Sensor Failure
REPLACE the sensor if any codes in red table below are active and/or
confirmed. Do not replace for inactive codes.
Fault Code
Fault Description
P220F-93
NOx Sensor Incorrect Value at Startup, No operation
P229E-13
NOx Sensor Bank 1 Sensor 2, Circuit open
P22A6-00
NOx sensor heater sense circuit, bank 1 sensor 2
P22A1-00
NOx Sensor Circuit High Bank 1 Sensor 2
P22A3-13
NOx Sensor Heater Control Bank 1 Sensor 2, Circuit open
P22A4-00
NOx sensor heater control circuit low, bank 1 sensor 2
P22FE-00 NOx Sensor Performance - Sensing Element Bank 1 Sensor 2
Direction/Repair: Replace the sensor in accordance with Impact instructions.
Do NOT Cut the sensor wiring harness, all NOX sensors are currently on
mandatory return.
Outlet NOx Sensor (NOx 2) Diagnostic Trouble Codes Potential Sensor Failure
Fault Code
Fault Description
P225E-00 NOx Sensor Performance - Signal Stuck High Bank 1 Sensor 2
Direction: Run the applicable PTT Operation per OBD Level.
Emission
PTT Operation
Level
OBD 132549-08-03-03 NOx Conversion Test
16
OBD 172589-08-03-18 Exhaust Aftertreatment System Analysts (make
18 VGT
sure NOx and SCR Subtest are selected)
Only
OBD 17- No test… Replace Outlet (NOx 2) NOx Sensors if not replaced
UI
; Live18
TC
within past 3 months and release truck. If NOx sensor has been
Only
replaced within past 3 months open an E-Service Case
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replaced within past 3 months open an E-Service Case.
OBD 19
and
Newer VGT
Only
2549-08-03-03 NOx Conversion Test
OR (whichever is available)
2589-08-03-18 Exhaust Aftertreatment System Analysts (only
Nox Subtest available)
OBD 19
and
Newer TC
Only
2549-08-03-03 NOx Conversion Test
Repair:
• If the Outlet (NOx 2) sensor fails the evaluation, replace the Outlet NOx
Sensor ONLY.
• If the NOx 1 sensor (Inlet NOx Sensor) fails the test, disregard the
results.
Diagnostic Trouble Codes With NOx Sensor in the Description
Direction/Repair: DO NOT REPLACE the NOx sensor(s) for these codes.
Diagnostics should be performed using PTT Diagnostics and the comment
section in the table below.
Fault
Code
P220A-1C
P220B-1C
Fault Description
Comments
NOx Sensor Supply Voltage Circuit (Bank 1
Sensor 1), Circuit voltage out of range
NOx Sensor Gas Outlet High Voltage, Circuit
voltage out of range
Power
supply
Power
supply
Sensor
reading fresh
air
Sensor
reading fresh
air
P225D-00
NOx Sensor Performance - Signal Stuck Low
Bank 1 Sensor 1
P225F-00
NOx Sensor Performance - Signal Stuck Low
Bank 1 Sensor 2
U029D-00
Lost Communication With NOx Sensor "A"
UI
U029E-00
; Live
Lost Communication with NOx Sensor B
Most likely
Harness
Issue
Most likely
Harness
Issue
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P229F-64
NOx Sensor Gas Outlet Removed, Signal
Nuisance
plausibility failure
code, most
likely
“Confirmed =
False”
Although the codes above have the term "NOx sensor" in their descriptions,
it is highly unlikely that the sensor is the cause of any of these codes. The
table above specifies the likely cause of each code.
Rules for Replacement
Warranty will only cover replacement of the NOx Sensors if one of the codes
in Red or Yellow listed above is active or confirmed. If the NOx Sensor is
suspected to have failed with no active or confirmed codes, an eService
case is required for further evaluation.
Review the video link below.
MACK
VOLVO
NOx Sensor
NOx Sensor
Standard Diagnostic Time for a NOx Sensor is 1.0 hr.
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Tags
p2200-13
p2203-00
p2205-13
p2206-00
p2208-00
p026c-00
p026d-00
p2201-64
p225c-00
p220f-93
p229e-13
p220a-1c
p220b-1c
; Live UI
p225d-00
p225f-00
u029d-00
u029e 00
p229f 64
p22fb 92
p220e 93
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p229f-64
p22fb-92
p22a6-00
p22a1-00
p22a3-13
p22a4-00
p22fe-00
p225e-00
p20ee-00
p103c-00
p207f-00
volvo
mack
Related links and attachments
No links or attachments available
p220e-93
Article
u029e-00
unlocking uptime
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