P1791

Test 477 Through 480:

Test 481:

SYMPTOM:
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 CAUSING SYMPTOM
INTERMITTENT CODE P1791

Tests 164 Through 167:

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