P1791

Test 1 Through 3:

Test 4 Through 5:

Symptom:
P1791-LOSS OF PRIME

When Monitored and Set Condition:
P1791-LOSS OF PRIME

When Monitored:
The transmission is any forward gear.

Set Condition:
The code will set if the transmission is slipping in any forward gear and the pressure switches are not indicating pressure, a LOSS of PRIME test is run.

POSSIBLE CAUSES
CHECKING SYMPTOMS AND POSSIBLE CAUSES
LOW BATTERY VOLTAGE
INTERMITTENT CODE P1791

Test 1 Through 5:

Symptom:
ADDITIONAL LOSS OF PRIME (P1791)

POSSIBLE CAUSES
AUTO TRANS INCORRECT FLUID LEVEL OR COOLER LINES
CUSTOMER DESCRIBES "NO DRIVE" CONDITION
FILTER PLUGGED, PAN FILLED WITH DEBRIS
OIL PUMP PRESSURE DROP AND "NO DRIVE" CONDITION