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(Back Office Only) Mack Chassis - Diagnosing The
Aftertreatment Control Module DTCs P202D,
P208E, P20E8 - OBD13 (Commonly Model Year
2014); Newer Chassis AFTER Reviewing Other
Solutions

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Internal Content

This solution should only be used for initial checks for OBD13 chassis.
For all newer chassis, this solution should not be followed unless the
other solutions pertaining to the correct emission level have been
followed first with no fault found.
1. Inspect the electrical circuit connections between the ACM and
the DEF pump at the DEF pump connector, ACM connector, and
FCUT connector. Pay special attention to the FCUT connector. A
minor amount of oxidation or corrosion will cause these DTCs.

If any corrosion is found in the FCUT connector, replace terminals
on the front chassis harness and urea tank harness as required.

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2. Inspect DEF system for contamination and clean as required.
Debris can build up in the filter screens under normal operation and
remain trapped in the system due to the reversion cycle at key off.
NOTE: If at any point a failure is found the root should should be
diagnosed from that point. No further step should be completed until
the problem has been verified.
∙ Remove all of the DEF fluid lines and flush out with compressed air
and water.
 ∙ Remove the Inlet and backflow connectors and inspect the filter
screens for debris and replace as required. Reference Impact 2589-1102-05 Aftertreatment Diesel Exhaust Fluid (DEF) Contamination Flush
 ∙ Remove the level sensor / sending unit from the DEF tank. If
contamination is found in the tank, the pickup filter must be replaced
with the latest updated part number in Impact. The tank must be
completely flushed.
 ∙ When re-priming the system with fresh DEF, remove the fluid
connector from the DEF doser and place into a container, start the
engine and allow a small amount of fresh fluid to purge.
 ∙ Verify that the DEF line connectors have a secure seal on the tube
ends when reconnecting the lines.

3. If the above actions do not resolve the complaint, proceed with the

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applicable
Guided Diagnostics. Terminal Corrosion example: FCUT

connector Debris found in DEF pump connector screens
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Tags

p100000
p1000-00

p208e00
p208e-00

p20e892
p20e8-92

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