KC-2116 Rev 8

7/5/23, 6:10 AM
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Mack NOx Sensor Troubleshooting Guide US10+OBD13 And Newer Emissions
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Overview
NOX SENSOR
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.
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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 (NOx1) 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
P220013
P220300
Fault Description
NOx Sensor Bank 1 Sensor 1, Circuit Open
NOx Sensor Circuit High Bank 1 Sensor 1
P220513
P220600
P220800
NOx Sensor Gas Inlet Open Circuit, Circuit open
NOx sensor heater control circuit low, bank 1 sensor 1
NOx sensor heater sense circuit, bank 1 sensor 1
NOx Sensor Heater Control Circuit Range/Performance (Bank 1
P220E93
Sensor 1), No operation
NOx Sensor Performance - Sensing Element Bank 1 Sensor 1,
P22FB92
Performance or Incorrect Operation
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.
Inlet NOx Sensor (NOx1) 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
P026C00
Fuel Injection Quantity Lower Than Expected
P026D00
Fuel Injection Quantity Higher Than Expected
P220164
NOx Sensor Bank 1 Sensor 1, Signal plausibility failure
P225C00 NOx Sensor Performance - Signal Stuck High Bank 1 Sensor 1
Direction:
Run the applicable PTT Operation per OBD Level.
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Emission Level
OBD13 to OBD16
Article
PTT Operation
2549-08-03-03 NOx Conversion Test
2589-08-03-18 Exhaust Aftertreatment System Analysis
(only NOx subtest to be run)
OBD17 to current
or (whichever is available)
2549-08-03-03 NOx Conversion Test
No test… Replace INLET (NOx1) NOx Sensors if not
replaced within past 3 months and release truck.
OBD17 to current
If the NOx sensor has been replaced within past 3
months open an E-Service Case.
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 (NOx2) 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
P220F93
NOx Sensor Incorrect Value at Startup, No operation
P229E13
NOx Sensor Bank 1 Sensor 2, Circuit open
P22A100
NOx Sensor Circuit High Bank 1 Sensor 2
P22A313
NOx Sensor Heater Control Bank 1 Sensor 2, Circuit open
P22A400
NOx sensor heater control circuit low, bank 1 sensor 2
P22A600
NOx sensor heater sense circuit, bank 1 sensor 2
P22FE00 NOx Sensor Performance - Sensing Element Bank 1 Sensor 2
Direction/Repair: Replace the sensor in accordance with Impact
instructions.
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Do NOT Cut the sensor wiring harness, all NOx sensors are currently
on mandatory return.
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Outlet NOx Sensor (NOx2) Diagnostic Trouble Codes
- Potential Sensor Failure
Fault Code
Fault Description
P113600
NOx Sensor 1/2 Correlation Calibration Error Bank 1
P225E00 NOx Sensor Performance - Signal Stuck High Bank 1 Sensor 2
Direction: Run the applicable PTT Operation per OBD Level.
Emission Level
OBD13 to OBD16
PTT Operation
2549-08-03-03 NOx Conversion Test
2589-08-03-18 Exhaust Aftertreatment System Analysis
(All available subtest to be run)
OBD17 to current
OR (whichever ia available)
2549-08-03-03 NOx Conversion Test
No test… Replace Outlet (NOx2) NOx Sensors if not
replaced within past 3 months and release truck.
OBD17 to current
If NOx sensor has been replaced within past 3 months
open an E-Service Case.
Repair:
• If the Outlet (NOx2) sensor fails the evaluation, replace the Outlet NOx
Sensor ONLY.
• If the NOx1 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.
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Fault
Code
Fault Description
Comments
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NOx Sensor Supply Voltage Circuit (Bank 1
Sensor 1), Circuit voltage out of range
NOx Sensor Gas Outlet High Voltage, Circuit
P220B1C
voltage out of range
NOx Sensor Performance - Signal Stuck
P225D00
Low Bank 1 Sensor 1
NOx Sensor Performance - Signal Stuck
P225F00
Low Bank 1 Sensor 2
P220A1C
P229F64
U029D00
U029E00
Power supply
Power supply
Sensor reading
fresh air
Sensor reading
fresh air
Nuisance code,
NOx Sensor Gas Outlet Removed, Signal
most likely
plausibility failure
“Confirmed =
False”
Most likely Harness
Lost Communication With NOx Sensor "A"
Issue
Most likely Harness
Lost Communication with NOx Sensor "B"
Issue
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.
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
p225d-00
p225f-00
u029d-00
u029e-00
p229f-64
p22fb-92
p220e-93
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p22a6-00
p22a1-00
p22a3-13
p22a4-00
p22fe-00
p225e-00
p20ee-00
p103c-00
p207f-00
mack
p220300
p22fb92
p220e93
p220513
p220600
p220800
p026c00
p026d00
p220164
p225c00
p220f93
p229e13
p22a600
p22a100
p22a313
p22a400
p22fe00
p1136-00
p113600
p225e00
unlocking uptime
p220013
Categories
Make and Model > Mack > CXU/CHU/PI - Pinnacle
Make and Model > Mack > LEU - TerraPro Low Entry
Make and Model > Mack > LR
Make and Model > Mack > TD - Titan
Make and Model > Mack > MRU/TE - TerraPro
Vehicle System > Emissions
Make and Model > Mack > AN - Anthem
Make and Model > Mack > GU/GR - Granite
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