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NHTSA ID Number: 10173134

Manufacturer Communication Number: DEF_CIR1

TSB/Document Date: 2020-04-02


Summary

repair instructions are intended to address CERTAIN fault(s):


DTC:

P10FF-86 / U029D / U029E / U02A2

GDC18-058

Bulletin:

May 10, 2018

Date:
Description:
Applies to:

See below for fault code description(s)
US13 – US14 Emissions

For Spanish click here: ESPAÑOL
General Information
These repair instructions are intended to address the following fault(s):
DTC

Description

Possible Cause

Possible (Observable)
Symptoms

Reductant Level
Sensor "A" Circuit
Electrical – Signal
Invalid

x
x
x

Low fluid level in the tank
Wiring harness
Reductant Level Sensor "A"

None

U029D

Lost Communication
with NOx Sensor B

x
x

Connector
NOx sensor

None

U029E

Lost Communication
with NOx Sensor B

x
x

Connector
NOx sensor

None

x
U02A2

Lost Communication
with Reductant
Quality Module

The electronic control unit (ECU) has a
software fault or the wrong software
version
Control unit has no supply voltage
Connector

None

P10FF-86

x
x

Required Parts
Part Number

Description

Quantity

21950837

DEF Wiring Harness

1

22055073

DEF Wiring Harness (LE, LR, MRU)

1

Repair Instructions
Aftertreatment Diesel Exhaust Fluid (DEF) Line, Electrically Heated, Replacement (Tank to Dosing Valve)

Removal
1. Apply the parking brake and place the shift lever in neutral.
2. Pull the vehicle hood latch and raise the hood.
3. Disconnect all cables from the negative (ground) battery terminals to prevent personal injury from electrical
shock and prevent damage to electrical components.
4. If equipped, remove the vehicle right-side chassis fairing (under the passenger-side door) covering the DEF
tank and surrounding components. Store the fairing in a secure location.
5. Remove the fasteners securing the right-side inner fender to the vehicle and remove the fender. Store the
fender in a secure location.
© 2016 Mack TruckseBay logo, Inc. Information is subject to change without notice.

Page 1/2

DTC:

P10FF-86 / U029D / U029E / U02A2

Bulletin:
Date:

GDC18-058
May 10, 2018

6. At the DEF pump, disconnect the following: connection to front chassis harness, DEF quality sensor, DEF
pump electrical connector, and the solenoid valve connector.

7. Cut the tie straps securing the DEF line to the vehicle chassis and aftertreatment assembly and remove the
defective line from the vehicle.
Installation
1. At the DEF pump, reconnect the connection to front chassis harness, DEF quality sensor, DEF pump
electrical connector, and the solenoid valve connector. Secure the harness using plastic tie straps.
2. Reconnect all previously removed cables to the negative (ground) battery terminals.
3. Start the engine and check for leaks and the proper operation of the replacement heated DEF line.
4. Use the fasteners to secure the right-side inner fender to the vehicle.
5. If equipped, position the vehicle right-side chassis fairing (under the passenger-side door) on the vehicle
chassis and secure with the fasteners.
6. Close the vehicle hood.

Additional Resources
These repairs are the most likely fix for the identified fault(s), if this does not fix the issue, Tech Tool will need to
be used for more detailed diagnostics. If filing a warranty claim, please include the ASIST case number.
Labor Code
2589-03-02-27

0.6

Causal Part

21950837 OR 22055073

© 2016 Mack TruckseBay logo, Inc. Information is subject to change without notice.

Page 2/2

DTC:

P10FF-86 / U029D / U029E / U02A2

GDC17-061

Boletín:

20 de febrero de 2020

Fecha:
Descripción:
Se aplica a:

Vea a continuación descripciones del código de
falla
Emisiones de US13 - US14

Para inglés, haga clic aquí: ENGLISH

Información general
Estas instrucciones de reparación están destinadas a abordar las siguientes fallas:
DTC

P10FF-86
U029D
U029E

U02A2

Descripción
Circuito eléctrico "A" de sensor de
nivel de reductor – Señal inválida
Comunicación perdida con sensor B
de NOx
Comunicación perdida con sensor B
de NOx

Comunicación perdida con módulo
de calidad del reductor

Posibles
síntomas
(observados)

Causa posible
x
x
x
x
x
x
x
x
x
x

Nivel de fluido bajo en el tanque
Arnés de cableado
Sensor "A" de nivel de reductor
Conector
Sensor NOx
Conector
Sensor NOx
La unidad de control electrónico
(ECU) tiene una falla de software o
una versión incorrecta del software
La unidad de control no tiene voltaje
de suministro
Conector

Ninguno
Ninguno
Ninguno

Ninguno

Piezas necesarias
Número de pieza

Descripción

Cantidad

21950837

Arnés de cableado DEF

1

Instrucciones de reparación
Línea de fluido de escape diésel de postratamiento (DEF), calentada eléctricamente, reemplazo (tanque a válvula
de dosificación)

Retiro
1. Aplique el freno de estacionamiento y coloque la palanca de cambios en punto muerto.
2. Abra el bloqueo del toldo y levante el toldo del vehículo.
3. Desconecte todos los cables de los terminales negativos (tierra) de la batería para evitar lesiones por
descargas eléctricas y daños en los componentes eléctricos.
4. Si está equipado, retire el compensador de chasis en el lado derecho del vehículo (bajo la puerta del
pasajero) que cubre el tanque de DEF y los componentes circundantes. Guarde el compensador en
una ubicación segura.
5. Retire los sujetadores que aseguran el guardabarro interno de la derecha al vehículo y retire el
guardabarro. Guarde el guardabarro en una ubicación segura.
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Página 1/2

DTC:

P10FF-86 / U029D / U029E / U02A2

Boletín:
Fecha:

GDC17-061
20 de febrero de 2020

6. En la bomba de DEF, desconecte lo siguiente: conexión al arnés de chasis delantero, sensor de calidad de
DEF, conector eléctrico de la bomba de DEF y el conector de la válvula de solenoide.

7. Corte las correas que aseguran la línea de DEF al chasis del vehículo y el conjunto de postratamiento, y
retire la línea defectuosa del vehículo.
Instalación
1. En la bomba de DEF, reconecte la conexión al arnés de chasis delantero, sensor de calidad de DEF,
conector eléctrico de la bomba de DEF y al conector de la válvula de solenoide. Asegure el arnés con
correas de plástico.
2. Vuelva a conectar todos los cables retirados anteriormente a los terminales negativos (tierra) de la batería.
3. Encienda el motor y revise fugas y el funcionamiento adecuado del reemplazo de la línea de DEF calentada.
4. Utilice los sujetadores para asegurar el guardabarro interno de la derecha al vehículo.
5. Si está equipado, ubique el compensador de chasis en el lado derecho (bajo la puerta del pasajero) en el
chasis del vehículo y asegure con los sujetadores.
6. Cierre el capó del vehículo.
Recursos adicionales
Es muy probable que estas reparaciones solucionen la falla identificada; si esto no soluciona el problema, se
requerirá el uso de Tech Tool para diagnósticos más detallados. Si presenta una reclamación de garantía,
incluya el número de caso ASIST.
Código de trabajo
2589-03-02-27

0.6

Pieza causal

21950837

© 2016 Mack TruckseBay logo, Inc. Información sujeta a cambios sin previo aviso.

Página 2/2

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TSB/Document ID: DEF_CIR1

Replacement Service Bulletin Number:

MFR Communication Date: 2020-03-10

MFR Internal Campaign ID/Software Version:

Communication Type: Service Bulletin/Repair Instructions

NHTSA Components: ENGINE AND ENGINE COOLING:ENGINE:DIESEL

MFR Component System:

MFR Component Subsystem:


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