Allison Transmission 4000 EVS

Table6–2.DTCListandDescriptions(cont'd)
DTC
Description
CHECK
TRANSLight
InhibitedOperation
Description
P27B2
InternalControlModule
TransmissionRange
ControlPerformance
Yes
Hydaulicdefault.
Transmissionisrestricted
toN(Neutral)3(Third
Range)4(Fourth
Range)5(FifthRange)
P27B4
OutputShaftDirection
Plausibility
Yes
Shiftnotinprocess,
LIRShiftinprocess,
completeshiftthenLIR.
TCMforcesVMMS
off.TCMinhibitsTCC
engagement.TCM
freezesshiftadapts.
P27B6
InternalControlModule
TransmissionSpeed
SensorPerformance
Yes
Shiftnotinprocess,
LIRShiftinprocess,
completeshiftthenLIR.
TCMforcesVMMS
off.TCMinhibitsTCC
engagement.TCM
freezesshiftadapts.
P2714
PressureControl
Solenoid(PCS)4Stuck
Off
Yes
DNS,RPR
P2715
PressureControl
Solenoid(PCS)4Stuck
On
Yes
DNS,SOLOFF
(hydraulicdefault)
P2718
PressureControl
Solenoid(PCS)4Control
CircuitOpen
Yes
DNS,SOLOFF
(hydraulicdefault)
P2719
PressureControl
Solenoid(PCS)4System
Performance
Yes
TCMforcesVMMoff,
TCMinhibitsTCC
engagement
P2720
PressureControl
Solenoid(PCS)4Control
CircuitLow
Yes
DNS,SOLOFF
(hydraulicdefault)
P2721
PressureControl
Solenoid(PCS)4Control
CircuitHigh
Yes
DNS,SOLOFF
(hydraulicdefault)
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