C-14 Allison Transmission Other Features
PA-1628Operator's ManualH3-45 COACH
DTC Description
CHECK
Light
Inhibited Operation
Description
P2721 Pressure Control Solenoid 4 (PCS4) Control Circuit High Yes
DNS, SOL OFF (hydraulic
default)
P2723 Pressure Control Solenoid 1 (PCS1) Stuck Off Yes DNS, RPR
P2724 Pressure Control Solenoid 1 (PCS1) Stuck On Yes DNS, RPR
P2727 Pressure Control Solenoid 1 (PCS1) Control Circuit Open Yes
DNS, SOL OFF (hydraulic
default)
P2729 Pressure Control Solenoid 1 (PCS1) Control Circuit Low Yes
DNS, SOL OFF (hydraulic
default)
P2730 Pressure Control Solenoid 1 (PCS1) Control Circuit High Yes
DNS, SOL OFF (hydraulic
default)
P2736 Pressure Control Solenoid 5 (PCS5) Control Circuit Open Yes Inhibit retarder operation
P2738 Pressure Control Solenoid 5 (PCS5) Control Circuit Low Yes
Allow 2 through 6, N, R. Inhibit
retarder and TCC operation
P2739 Pressure Control Solenoid 5 (PCS5) Control Circuit High Yes Inhibit retarder operation
P273F
Retarder Oil Temperature Sensor Over Temperature
Condition
No None
P2742 Retarder Oil Temperature Sensor Circuit – Low No
Use default retarder temp
values
P2743 Retarder Oil Temperature Sensor Circuit – High No
Use default retarder temp
values
P2761 TCC PCS Control Circuit Open Yes Inhibit TCC operation
P2763 TCC PCS Control Circuit High Yes Inhibit TCC operation
P2764 TCC PCS Control Circuit Low Yes
7-speed: Allow 2 through 6, N,
R.
Inhibit TCC operation
P2789
Transmission Clutch Life Expired (Clutch Adaptive Learning
at Limit)
No None
P2793 Gear Shift Direction Circuit Yes
Ignores PWM input from shift
selector
P2808 Pressure Control Solenoid 6 (PCS6) Stuck Off Yes DNS, RPR
P2809 Pressure Control Solenoid 6 (PCS6) Stuck On Yes DNS, RPR
P2812 Pressure Control Solenoid 6 (PCS6) Control Circuit Open Yes
DNS, SOL OFF (hydraulic
default)
P2814 Pressure Control Solenoid 6 (PCS6) Control Circuit Low Yes
DNS, SOL OFF (hydraulic
default)
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