Code Listings And Procedures
(Allison 4
th
Generation Controls)
(cont’d)
P0880, P0881,
P0882, P0883
TCM Power
Input Signal
Fault
1. Check:
a. Battery direct ground and power connections are
tight and clean.
b. Vehicle batteries are charged.
c. Vehicle charging system is not over- or
under-charging.
d. VIM fuse is good.
e. VIM connections are tight, clean, and undamaged.
f. Vehicle manufacturer supplied wiring is correct.
g. TCM connection is tight, clean, and undamaged.
P0894
Transmission
Component
Slipping
1. Let the vehicle idle with the parking brake applied,
wheels chocked, and vehicle level. Check:
a. Correct dipstick is installed.
b. Fluid level is correct.
P0960, P0964,
P0968, P2727,
P2736, P2761
Pressure
Control
Solenoid
Circuit Open
1. Check:
a. Main transmission connector is tight, clean, and
undamaged.
b. TCM connector is tight, clean, and undamaged.
c. Wiring harness has no opens.
P0962, P0965,
P0970, P2720,
P2729, P2738,
P2764
Pressure
Control
Solenoid
Circuit Low
1. Check:
a. Main transmission connector is tight, clean, and
undamaged.
b. TCM connector is tight, clean, and undamaged.
c. Wiring harness has no shorts-between-wires or
shorts-to-ground.
P0963, P0966,
P0971, P2721,
P2730, P2739,
P2763
Pressure
Control
Solenoid
Circuit High
1. Check:
a. Main transmission connector is tight, clean, and
undamaged.
b. TCM connector is tight, clean, and undamaged.
c. Wiring harness has no shorts-between-wires.
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