PIT5788A

Bulletin No.: PIT5788A
Published date: 01/19/2022
Preliminary Information
PIT5788A Slow or No Crank, Low Battery Voltage, Parasitic Draw,
Dead Battery
Models
Brand:
Model:
Model Years:
VIN:
from
to
Engine:
Transmissions:
Cadillac
Escalade Models
2021 - 2022
All
All
All
All
Chevrolet
Suburban
2021 - 2022
All
All
All
All
Chevrolet
Tahoe
2021 - 2022
All
All
All
All
GMC
Yukon Models
2021 - 2022
All
All
All
All
Involved Region or Country North America
Condition
Some customers my comment on a no/slow crank due to a low or dead battery. If
the rear HVAC mode door and/or temperature door operation is checked, one of the
doors may not function correctly. In addition, while the vehicle is turned o , it may
be noticed that the backlighting for either the front or rear HVAC controls is
turning on, even though the ignition is o and the vehicle should be asleep.
The cause of this concern could be the rear HVAC actuators not completing a learn
procedure. The learn procedure may not complete if the door can not move
through its full travel. This could be caused by, but not limited to:
Cause
- Foreign object that has fallen into the rear HVAC case, as shown below. This object
could limit the door from moving through its full travel.
- An issue with either the power, ground or LIN bus circuits to one of the rear HVAC
actuators.
- A faulty rear HVAC actuator
If one of the rear HVAC doors is not able to move through its full travel, the door
learn procedure will be incomplete. If the door learn procedure is incomplete the
vehicle will try to perform a relearn procedure after the vehicle is turned o . If the
relearn still does not complete the vehicle will continue to perform the relearn
procedure until the battery is depleted.
Correction:
Check the rear HVAC mode and temperature door operation. Make sure the rear mode operates from roof to
oor and the temperature from full hot to full cold. If either door does not function properly, then access the rear
HVAC case. Inspect the rear HVAC doors for any mechanical issues that may limit or prevent the door from
moving smoothly or moving through its full range of travel and repair as necessary. Inspect for any electrical
issues to each rear HVAC actuator. In some cases, we have seen connector X251A not fully connected.
Warranty Information
For vehicles repaired under warranty, please use the appropriate warranty labor operation based on the actual
cause and repair.
Version History
Version
Modi ed
2
10/27/2020 - Created on.
01/19/2022 - Updates to the model year, cause, and correction sections
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