Allison

Main code 57 indicates failure of the range verification C3 pressure switch test. Range verification C3 pressure switch while in 4th. The test occurs when a range is commanded that does not use the C3 clutch (neutral, 1, 2, 4, and 6). The code is set if the C3 pressure switch is closed when it should be open. If C3 clutch comes on when not needed, three clutches are applied and a transmission tie-up occurs. The ECU will command a range which does not use the C3 clutch and activate the DO NOT SHIFT response.

Main code 57 indicates failure of the range verification C3 pressure switch test. Range verification C3 pressure switch while in 6th. The test occurs when a range is commanded that does not use the C3 clutch (neutral, 1, 2, 4, and 6). The code is set if the C3 pressure switch is closed when it should be open. If C3 clutch comes on when not needed, three clutches are applied and a transmission tie-up occurs. The ECU will command a range which does not use the C3 clutch and activate the DO NOT SHIFT response.

Main code 57 indicates failure of the range verification C3 pressure switch test. Range verification C3 pressure switch while in N1. The test occurs when a range is commanded that does not use the C3 clutch (neutral, 1, 2, 4, and 6). The code is set if the C3 pressure switch is closed when it should be open. If C3 clutch comes on when not needed, three clutches are applied and a transmission tie-up occurs. The ECU will command a range which does not use the C3 clutch and activate the DO NOT SHIFT response.

Main code 57 indicates failure of the range verification C3 pressure switch test. Range verification C3 pressure switch while in N2/N4. The test occurs when a range is commanded that does not use the C3 clutch (neutral, 1, 2, 4, and 6). The code is set if the C3 pressure switch is closed when it should be open. If C3 clutch comes on when not needed, three clutches are applied and a transmission tie-up occurs. The ECU will command a range which does not use the C3 clutch and activate the DO NOT SHIFT response.

Main code 61 indicates the ECU has detected a hot fluid condition in the output retarder. Possible causes (but not all causes) for hot fluid are:1. Prolonged retarder use.2. Low fluid level.3. High fluid level.4. A retarder apply system that allows the throttle and retarder to be applied simultaneously.5. Cooler inadequately sized for retarder.