DIAGNOSTIC MANUAL
AFTERTREATMENT SYSTEM FAULT CODES
7.1. MAXXFORCE
®
DT, 9 AND 10 (EPA 10)
SPN
FMI
Condition
Possible Causes
3242
2
DPFIT signal does not agree with
other exhaust sensors
•
Biased DPFIT circuit or sensor
3242
3
DPFIT signal Out of Range HIGH
•
DPFIT signal OPEN or short to PWR
•
SIG GND circuit OPEN
•
Failed DPFIT sensor
3242
4
DPFIT signal Out of Range LOW
•
DPFIT signal circuit short to GND
•
Failed DPFIT sensor
3246
2
DPFOT signal does not agree with
other exhaust sensors
•
Biased DPFOT sensor or circuit
3246
3
DPFOT signal Out of Range HIGH
•
DPFOT signal circuit OPEN or short to
PWR
•
SIG GND circuit OPEN
•
Failed DPFOT sensor
3246
4
DPFOT signal Out of Range LOW
•
DPFOT signal circuit short to GND
•
Failed DPFOT sensor
3246
7
DPFOT not warming along with
engine
•
Biased DPFOT circuit or sensor
3246
20
DPF over temperature - possible
filter damage
•
Restricted DPF
•
DOC Failure
•
Engine over fueling
•
Downstream Injection over fueling
•
Biased DPFOT sensor or circuit
3251
2
DPFDP above or below desired level
•
Biased DPFDP sensor or circuit
•
Restricted or plugged DPF
•
Reversed DPF sensor hoses
3251
3
DPFDP signal Out of Range HIGH
•
DPFDP signal circuit short to PWR
•
SIG GND circuit OPEN
•
Failed DPFDP sensor
3251
4
DPFDP signal Out of Range LOW
•
Reversed DPFDP sensor hoses
•
DPFDP signal circuit OPEN or short to
GND
•
Failed DPFDP sensor
3251
10
DPFDP signal abnormal rate of
change
•
DPFDP sensor tubes restricted or open
•
Biased DPFDP circuit or sensor
75
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