ALLISON 3000 MH Transmission Fault Codes DTC
Fault Codes DTC of ALLISON 3000 MH Transmission
CODES QUICK CHECKS
MAIN
CODE
SUB
CODE
13 12 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. ECU connectors are tight, clean, and undamaged.
ECU Input Voltage
Low
13 13
ECU Input Voltage
Medium Low
13 23
ECU Input Voltage
High
14 12, 23 Check:
a. Is transmission equipped with oil level sensor?
b. Engine speed sensor, output speed sensor,
temperature sensor, and oil level sensor are
working correctly.
c. Wiring harness has no opens, shorts to ground, or
shorts to battery.
Oil Level Sensor
21 12, 23 Check:
a. TPS connector is properly connected.
b. End of TPS cable is pulled out properly.
c. Engine fuel lever is in idle position.
d. Engine fuel lever provides proper amount of
stroke on TPS cable.
e. Wiring harness to TPS has no opens, shorts
between wires, or shorts to ground.
f. TPS for proper operation and resistance readings.
Throttle Position
Sensor
CODES QUICK CHECKS
MAIN
CODE
SUB
CODE
22 14, 15, 16 Check:
a. Speed sensors and connectors are tight, clean, and
undamaged.
b. Wiring harness to sensors has no opens, shorts
between wires, or shorts to ground.
Speed Sensors
23 12, 13, 14,
15, 16
Check:
a. ECU connectors are tight, clean, and undamaged.
b. Shift selector connector is tight, clean, and
undamaged.
c. Wiring harness has no opens, shorts between
wires, or shorts to ground.
d. Shift selector(s) for proper operation.
Shift Selectors
24 12 Check:
a. Air temperature is below –32°C (–25°F)
• If yes, this is a correct response for
temperature.
• If no, check that main transmission connector is
tight, clean, and undamaged.
b. ECU connectors are tight, clean, and undamaged.
Sump Fluid
Temperature Cold
24 23 Verify the overheat situation. Check:
a. Correct dipstick is installed.
b. Fluid level is correct. Refer to CARE AND
MAINTENANCE section.
• If fluid level is incorrect—correct fluid level.
• If fluid level is correct—check for cause of
overheating.
c. Check if ECU and transmission connectors are
tight, clean, and undamaged.
Sump Fluid
Temperature Hot
CODES QUICK CHECKS
MAIN
CODE
SUB
CODE
25 00, 11, 22,
33, 44, 55,
66, 77
Check:
a. Speed sensor connector is tight, clean, and
undamaged.
b. ECU connectors are tight, clean, and undamaged.
c. Fluid level is correct. Refer to CARE AND
MAINTENANCE section.
d. Wiring harness to sensor has no opens, shorts
between wires, or shorts to ground.
Output Speed
Sensor
26 00, 11 Check:
a. TPS for proper operation, related harness for
opens and shorts.
b. Serial connection to engine is tight, clean, and
undamaged.
c. SCI wiring harness has no opens or shorts.
Throttle/Engine
Coolant Source Not
Detected
32 00, 33, 55,
77
Check:
a. Correct dipstick is installed.
b. Fluid level is correct. Refer to CARE AND
MAINTENANCE section.
c. Main transmission connector is tight, clean, and
undamaged.
d. ECU connectors are tight, clean, and undamaged.
e. Wiring harness has no opens, shorts between
wires, or shorts to ground.
C3 Pressure Switch
Open
33 12, 23 Check:
a. Main transmission connector is tight, clean, and
undamaged.
b. ECU connectors are tight, clean, and undamaged.
c. Wiring harness has no opens, shorts between
wires, or shorts to ground.
Sump Oil
Temperature Sensor
Failure
CODES QUICK CHECKS
MAIN
CODE
SUB
CODE
34 12, 13, 14,
15, 16, 17
a. Recalibrate ECU, if possible.
EEPROM b. Replace ECU if not possible to recalibrate.
35 00, 16 Check:
a. ECU connectors are tight, clean, and undamaged.
b. VIM connectors are tight, clean, and undamaged.
c. Vehicle manufacturer supplied wiring has correct
power and ground connections.
d. Power connections are battery direct.
e. Ground connections are battery direct.
f. Ignition switch connections are correct.
Power Interruption
Real Time Write
Interruption
36 00, 01, 02
a. If able, recalibrate ECU; if not, replace ECU.
b. Check that ECU is compatible with TransID level
(36 01).
c. Troubleshoot TransID wire and circuit for short to
battery (36 02).
Hardware/Software
Not Compatible
42 12, 13, 14,
15, 16, 21
22, 23, 24,
26
Check:
a. Main transmission connector is tight, clean, and
undamaged.
b. ECU connectors are tight, clean, and undamaged.
c. Wiring harness is not pulled too tight, and there is
no damage, chafing, or screws through harness.
d. Wiring harness has no opens, shorts between
wires, or shorts to ground.
e. Unauthorized repairs have not been made.
f. Change harness (optional).
Short to Battery in
Solenoid Circuit
CODES QUICK CHECKS
MAIN
CODE
SUB
CODE
44 12, 13, 14,
15, 16, 21,
22, 23, 24,
26
Check:
a. Main transmission connector is tight, clean, and
undamaged.
b. ECU connectors are tight, clean, and undamaged.
c. Wiring harness has no opens, shorts between
wires, or shorts to ground.
Solenoid Circuit
Short to Ground
45 12, 13, 14,
15, 16, 21,
22, 23, 24,
26
Check: a. b. c.
a. Main transmission connector is tight, clean, and
undamaged.
b. ECU connectors are tight, clean, and undamaged.
c. Wiring harness has no opens or shorts.
Solenoid Circuit
Open
46 21, 26, 27 Check:
a. Main transmission connector is tight, clean, and
undamaged.
b. ECU connectors are tight, clean, and undamaged.
c. Wiring harness has no opens, shorts between
wires, or shorts to ground.
d. Replace ECU.
Solenoid
Overcurrent
51 01, 10, 12,
21, 23, 24,
35, 42, 43,
45, 46, 53,
64, 65,
XY*
Check:
a. Output and turbine speed sensor connectors are
tight, clean, and undamaged.
b. Speed sensor wiring harness has no opens, shorts
between wires, or shorts to ground.
c. Correct dipstick is installed.
d. Fluid level is correct. Refer to CARE AND
MAINTENANCE section.
Offgoing Ratio Test
(During Shift)