Pig
GUARDDOG CONNECT es
DTC: P10CE-97 Bulletin: © GDC25-003 Date: Sept 29, 2025
Description: Reductant Return: No Flow Detected
Applies To: US24 and Newer Emissions Product Class (B2)
For Spanish click here: ESPANOL For French click here: FRANCAIS
General Information
These repair instructions are intended to address the following fault(s):
Possible Cause Possible (Observable) Symptoms
« Restricted orifice in the aftertreatment fuel
Reductant Return: manifold Aftertreatment DEF P
P1IOCE-97 Ne Fo a te ‘ted e Damaged hoses and/or connections “Bleed Orit ump
0 Flow Vetecte e Aftertreatment Diesel Exhaust Fluid (DEF) Pump eed Oriice
e Blocked return line (damaged or frozen)
Required Parts
24327566 Diesel Exhaust Fluid (DEF) Pump Unit
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.
|Laborcode
2581-08-0201
24327566
© 2025 Mack Trucks, Inc. Information is subject to change without notice. Page 1/4

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GUARDDOG CONNECT wee en

DTC: P10CE-97 Bulletin: _GDC25-008 Date: March 25, 2025
Repair Instructions
2581-03-02-01Aftertreatment Diesel Exhaust Fluid (DEF) Pump Unit, Replacement
> Do not spill reagent (Diesel Exhaust Fluid) a

Illustrations may differ slightly on disassembled connectors. if this occurs, WARNING
from the actual vehicle being serviced. replace ihe connectors immediately. Do not Risk of burn injuries.
However, key components addressed in clean WIEN water or compressed alr. The coolant may be hot.
this information are represented as > The cooling system is under pressure and
accurately as possible. a can reach a temperature sufficient to cause
burns, Allow the coolant temperature to reach a

Been ical b safe level before starting the work,

. Colors used in illustrations are for Risk of chemical burn. > Remove the coolant tank cap carefully. Use
highlighting purposes only and do not Reagent (Diesel Exhaust Fluid) may splash up if appropriate protective equipment.
correspond to the actual colors of the the system is pressurized.
vehicle. id | ao |

Switch off the ignition. Wait at least two

minutes before disconnecting the batteries or , CAUTION

All threaded fasteners that do not removing the hoses in order to allow the Risk of material damage.
have a tightening torque specification automatic draining of the exhaust Liquids can enter the unit.
in the information are tightened to a aftertreatment system. > Cover electrical connectors with the
standard torque. Standard torques are protection provided.
available in the following A
specification.™ Standard Tightening CAUTION BD vrcnine
Torques Risk of material damage. Risk of serious injury.
A Deficient reagent (Diesel Exhaust Fluid) can Physical inj

h ysical injury.
- CAUTION cause failure to the exhaust aftertreatment > Wear appropriate safety equipment.
Risk of material damage. system.
Reagent (Diesel Exhaust Fluid) oxidizes metal > | |
and the capillary action creeps through lines at Use only the reagent (Diesel Exhaust Fluid)
a speed of approx. 0.6 meters per hour. approved by the manufacturer.
© 2025 Mack Trucks, Inc. Information is subject to change without notice. Page 2/4

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GUARDDOG CONNECT ae 0
DTC: PI10CE-97 Bulletin: GDC25-008 Date: March 25, 2025
Park the vehicle on a level surface, Apply the parking brake. Place the gear ep” A -
lever in neutral. = a o—-_ ae —~
Install the wheel chocks. Recs ) efi Jie By.
Unlatch the LH fairing. Remove the tether. bare of i; LE —
Remove the fairing. “4 4 \“ a are
Decommission the low voltage system. S =~ | 4 SS > r yp
1 Turn the dash mounted battery switch to the (OFF) position or (if hd ¢ 1 ¥ x a ee
equipped) press the LOCK button twice. ; a” ri A>] Rt
2 Remove the screws and move the splash shield out of the way. y & eS ae f Ss ‘ae
3 Remove the nut, screws, and brackets. Remove the battery switch cover. . Se Sed ny — Re we
4 Turn the battery disconnect switch to the (OFF) position. Ze yp Se 4 —
5 Disconnect the connector. 7 4 Sa = = 4.
6 Unlatch the battery cover and remove. e >. r | ~~ N Ps
7 Remove the nut, fuse, and the battery negative cable. e cae Aes eS
8 If equipped with Ultra Capacitor. Remove the nut and battery negative oo as ne i ~— “ if
cable from ultra capacitor. 1 By cia a yO 1“ ‘We i
Pe er Ar an ~~ ee we >
Ce od
Drain the cooling system using either a coolant extractor or a drain hose and iz: ms wT
pan. | ee | \ a
Disconnect the electrical connector. (3 Lag iT eos :
Protect the electrical connector. \ .
ae yee
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lk

Note the positions and remove the cable ties. Move aside the pipes. Bal We ae = GF | c ny CS
Remove the screws and remove the bracket. s> so ey “~~ ee sg

| oa os 7 ms 5

, oe a hs "
7 aS & B-
oo ie ¥ or a
© 2025 Mack Trucks, Inc. Information is subject to change without notice. Page 3/4

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GUARDDOG CONNECT ae 0
DTC: PI10CE-97 Bulletin: GDC25-008 Date: March 25, 2025
Disconnect the connectors. tees _—. SS 5 7)
Protect the connectors. DE lit See t
Move aside the hoses. By eatnes oie - Z
Install the pliers (A). es ae 0 ~ onl oan
Remove the hoses. A aie i. We wae
aoNY \ !
£] A es
Remove the screws, brackets, and pump unit. py si SD eo Da
Install new pump unit by reversing above steps. if Fr h oe ail u
Clean the equipment and tools that have come into contact with the reagent #€ is i fi 6 9
(Diesel Exhaust Fluid). i ~ Wie . I
Fill the cooling system. ne V4 2 . » ~_ =
Nees a
Commission the low voltage system. " ae a, —— =
1 Install the battery negative cable from ultra capacitor if equipped. Install Es. 4 es A a, , = 2
the nut. eed ee oN SN
2. Tighten the nut to torque. Tightening torque cable terminal, nut 20 +2 Nm iF p } N__ “yy dn VE yy o
(15 £1 Ibftt) ra ew WA ba. E
3 Install the battery negative cable. Install the fuse. Install the nut. ig Ps . - AG é ye
4 Tighten the nut to torque. Tightening torque battery, terminal, nut 20 +2 [Pse>—s ae ~ by ‘a Ale
Nm (15 +1 Ibf-ft) (2s mB = ———
5 Install the battery cover. Latch the battery cover. Connect the connector. aa 2 © eo i . :
Turn the switch to the (ON) position. ae f \ a cS
6 Install the battery switch cover. Install the brackets. Install the screws. a ee a A +
Install the nut. > a ee = | A
7 Position the splash shield. Install the screws. a Za.
8 Turn the dash mounted battery switch to (ON) position or (if equipped) , a SE .
push the Unlock button twice. 7 -
Install the LH fairing. Install the tether. Latch the fairing. > a .
Start the engine. Check for leaks. Stop the engine. let gee E
Connect the diagnostic tool (Premium Tech Tool). - eS
Perform Function parameters reset, calibration in the diagnostic tool, a Bao,
Disconnect the diagnostic tool (Premium Tech Tool). Ss bare o/
Remove the wheel chocks. xy Wwe
Hell AN
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