PREVOST X3-45 COMMUTER 2018, Operator'S Manual, Page: 169 / 172

APPENDIX B – Allison Transmission’s Other Features 12-5
PA1633 X3-45 Commuter Operator’s Manual
CATEGORY OF RESPONSE ACTIONS TAKEN
DNS - Do Not Shift Release lock up (LU) clutch and inhibit lock up operation.
Inhibit shifts from the current attained range.
Turn on the CHECK light.
Display the current attained range in the MONITOR window of the shift
selector.
Blank the SELECT window of the shift selector.
Ignore any range selection inputs from the shift selector.
SOL OFF - SOLenoid
OFF All solenoids are commanded off, resulting in hydraulic default operation of
the transmission – PCS1 & PCS2 are on hydraulically when off electrically.
RPR - Return to
Previous Range When the speed sensor ratio or PS1 tests do not pass, the TCM commands
the same range as commanded before the shift.
NNC - Neutral No
Clutches When certain speed sensor ratio or PS1 tests do not pass, the TCM
commands a neutral condition with no clutches applied.
DNA - Do Not Adapt The TCM stops adaptive shift control while the code is active.
DIAGNOSTIC TROUBLESHOOTING CODES (DTC) LIST - ALLISON 5
TH
GENERATION CONTROLS
DTC Description
CHECK
Light
Inhibited Operation
Description
C1312 Retarder Request Sensor Failed Low No
May inhibit retarder operation if not
using J1939 datalink
C1313 Retarder Request Sensor Failed High No
May inhibit retarder operation if not
using J1939 datalink
P0122 Pedal Position Sensor Circuit Low Voltage No
Use default throttle values. Freezes
shift adapts.
P0123 Pedal Position Sensor Circuit High Voltage No
Use default throttle values. Freezes
shift adapts.
P0218 Transmission Fluid Over Temperature Yes Use default sump temp
P0562 System Voltage Low No Inhibit TCC Operation, DNA
P0602 TCM Not Programmed Yes Lock in Neutral
P0604 Control module random access memory (RAM) Yes Lock in Neutral
P0614 Torque Control Data Mismatch - ECM/TCM Yes
Allows operation only in reverse and
second range.
P0634 TCM Internal Temperature Too High Yes SOL OFF (hydraulic default)
P0642 Sensor Reference Voltage "A" Circuit Low Yes
Default sensor data used
P0643 Sensor Reference Voltage "A" Circuit High Yes Default sensor data used
P0657
Actuator Supply Circuit Voltage 1 Open (HSD 1)
Yes
SOL OFF, DNA, Inhibit TCC
operation, Inhibit main modulation
P0658 Actuator Supply Voltage 1 (HSD1) Low Yes DNS, SOL OFF (hydraulic default)
P0659 Actuator Supply Voltage 1 (HSD1) High Yes DNS, SOL OFF (hydraulic default)
P0703 Brake Switch Circuit Malfunction No
No Neutral to Drive shifts for refuse
packer. TCM inhibits retarder
operation if a TPS code is also
active.
P0708 Transmission Range Sensor Circuit High Input Yes Ignore defective strip selector inputs
P070C Transmission Fluid Level Sensor Circuit – Low Input No None
P070D Transmission Fluid Level Sensor Circuit – High Input No None