DTC (Code)
Codigo:

Bulletin:

P10CE-97

RD18-002

Date Fecha: June 13, 2018

Description:

Reductant Return: No Flow Detected - Component or System
Operation Obstructed or Blocked

Application:

US13 – US20 Emissions

General Information
These repair instructions are intended to address the following fault(s):
DTC

Description
•

P10CE-97

Reductant
Return: No Flow
Detected

Possible (Observable)
Symptoms

Possible Cause

•
•
•

Restricted orifice in the aftertreatment fuel
manifold
Damaged hoses and/or connections
Aftertreatment Diesel Exhaust Fluid (DEF)
Pump
Blocked return line (damaged or frozen)

Aftertreatment DEF Pump
Bleed Orifice

Required Parts
Part Number

Description

Quantity

21576178

Diesel Exhaust Fluid (DEF) Pump Unit

1

Repair Instructions
Aftertreatment Diesel Exhaust Fluid (DEF) Pump Unit, Replacement

Before replacing the DEF Pump Unit please check for damaged return hoses and connectors.
1. Disconnect and clean the aftertreatment DEF lines between the DEF tank and the DEF pump using water and
compressed air. If the line is broken then it will have to be replaced.

© 2016 Information is subject to change without notice.

Page 1 of 4

DTC (Code)
Codigo:

P10CE-97

Bulletin:

RD18-002

Date Fecha: June 13, 2018

Removal
1. Apply parking brake and place shift lever in neutral.
2. Open rear engine service doors.
3. Remove all cables from ground (negative) battery terminals to prevent personal injury from electrical shock and
prevent damage to electrical components.
4. Open right rear engine service door.
5. Connect the coolant extractor to the drain fitting at the bottom of the radiator and drain the coolant. Note: An
alternate method is to connect the coolant drain hose to the drain fitting and drain the coolant into a suitable
container. Special tools: 85112740, 9996049
6. Place a suitable container under the DEF tank to catch fluid that may drain from the pump. Note: Use protective
equipment and an approved suitable container. Dispose of DEF according to local regulations.
7. Mark the DEF lines before removal. Remove the DEF inlet, backflow and outlet lines from the pump. Place
protective caps on the DEF lines. Note: For information on the handling of DEF, refer to “General Safety
Practices”, Group 20. Note: If inlet and backflow lines are switched, the system will not start.

1. DEF Outlet Line
2. DEF Backflow Line
3. DEF Inlet Line
8. Remove the inlet and outlet coolant lines from the pump. Place protective caps on the coolant lines.

1. Coolant Lines

© 2016 Information is subject to change without notice.

Page 2 of 4

DTC (Code)
Codigo:

P10CE-97

Bulletin:

RD18-002

Date Fecha: June 13, 2018

9. Remove cable tie and disconnect the wiring harness connector from the DEF pump. Cover the wiring harness
connector with a plastic bag to protect from possible damage from DEF.

10. Remove the fasteners, brackets and DEF pump from the mounting bracket.

1. DEF Pump
2. Fasteners
3. Brackets
Installation
1. Position the DEF pump onto the mounting bracket and install brackets and fasteners. Tighten the fasteners to
specification, refer to Function Group 20, Specifications.
2. Remove plastic bag from the wiring harness connector. Attach the wiring harness connector to the DEF pump
and secure the harness using a cable tie.
3. Install the inlet and outlet coolant lines onto the DEF pump.
4. Install DEF inlet, backflow and outlet lines onto the pump. Note: If inlet and backflow lines are switched, the
system will not start.
5. Fill the cooling system with the recommended coolant using the coolant extractor. Ensure the coolant system is
full. Special tools: 85112740
6. Install all previously removed cables to the ground (negative) battery terminals.
7. Connect Tech Tool to the vehicle. Use Guided Diagnostics to read and clear any diagnostic trouble codes
(DTCs). Check for proper operation and for leaks.
8. Close right rear engine service door.
9. Close rear engine service doors.

© 2016 Information is subject to change without notice.

Page 3 of 4

DTC (Code)
Codigo:

Bulletin:

P10CE-97

RD18-002

Date Fecha: June 13, 2018

Additional Resources
These repairs are the most likely fix for the identified fault, 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
2589-03-02-36

1.1

Causal Part

21576178

© 2016 Information is subject to change without notice.

Page 4 of 4