P1791

P1791 - LOSS OF PRIME

When Monitored and Set Condition:
P1791 - LOSS OF PRIME

When Monitored: If the transmission is slipping in any forward gear and the pressure switches are not indicating pressure, a loss of prime test is run.

Set Condition: If the transmission begins to slip in a forward gear and the pressure switch(s) that should be closed are open a loss of prime test begins. Available elements are turned on by the TCM to see if pump prime exists. The DTC sets if no pressure switch(s) respond.

POSSIBLE CAUSES:
INVALID PRNDL CODE
INTERMITTENT OPERATION
INCORRECT FLUID LEVEL
PLUGGED FILTER
OIL PUMP-LOSS OF PRIME