(Table 240, contd)
Service Error Identifiers
Description Troubleshooting
$1168
Engine Exhaust Back Pressure Too High
The observed exhaust back pressure when
testing the EBPR is too high. Look for associ-
ated EBPR diagnostics. Run the “Air System
Motor Valves Verification Test” to check cor-
rect operation of the EBPR.
$1169
Engine Exhaust Back Pressure Too Low
The observed exhaust back pressure when
testing the EBPR is too low. Look for associ-
ated EBPR diagnostics. Check for exhaust
system leaks. Run the “Air System Motor
Valves Verification Test” to check correct oper-
ation of the EBPR.
$116F
Engine Exhaust Gas Recirculation Valve Not
Responding to Command
Bring engine to idle and remove load. The cur-
rent operating load may be too high to allow
the EGR valve to close.
Check for associated EGR valve diagnostics.
Run the “Air System Motor Valves Verification
Test” to check correct operation of the EGR
valve.
$1172
Diesel Particulate Filter Soot Loading Too Low
The soot level in the DPF is not high enough
to warrant running a regeneration. At low soot
levels, the rate of regeneration is extremely
slow negating the value of the test.
$1173
Diesel Particulate Filter Regeneration Rate Too
Low
The procedure is running in optimum condi-
tions for DPF soot regeneration with no issues
with soot sensor measurement. However, ob-
served soot load is not reducing. Contact the
Dealer Solutions Network (DSN) for further
advice.
Aftertreatment Sulfation Recovery Procedure
$0002
Active Diagnostic Present
Resolve any active diagnostic codes. Refer to
the appropriate troubleshooting procedure.
$10CB
Engine Load Too High
Bring the engine to idle and remove load. Cur-
rent operating load is too high to allow EGR
Valve to close and EBPR to operate. Restart
the Aftertreatment Sulfation Recovery
Procedure.
$10D0
Engine Has Not Been Running Long Enough
Allow the engine to idle for 2 minutes and then
restart the Aftertreatment Sulfation Recovery
Procedure.
$10FB
Engine RPM Too Low
Lower the engine speed to idle. The test will
try to take speed control to put engine in ac-
ceptable speed range. Restart the Aftertreat-
ment Sulfation Recovery Procedure.
$10FC
Engine RPM Too High
Lower the engine speed to idle. The test will
try to take speed control to put engine in ac-
ceptable speed range. Restart the Aftertreat-
ment Sulfation Recovery Procedure.
$112C
Particulate Filter Intake Temperature Too Low
The DPF inlet temperature is too low to allow
successful DPF desulfation. Refer to Trouble-
shooting, “Diesel Particulate Filter Intake Tem-
perature Is Low” and check for exhaust leaks.
Restart the Aftertreatment Sulfation Recovery
Procedure.
(continued)
498 UENR4469-36
Service
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