PIT5973

Bulletin No.: PIT5973
Published date: N/A
Preliminary Information
PIT5973 Dead Battery After Recall N222386380 and-or Unwanted
Liftgate Opening
Models
Brand:
Model:
Model Years:
VIN:
from
to
Engine:
Transmissions:
Cadillac
Escalade Models
2022 - 2023
All
All
All
All
Chevrolet
Suburban
2022 - 2023
All
All
All
All
Chevrolet
Tahoe
2022 - 2023
All
All
All
All
GMC
Yukon Models
2022 - 2023
All
All
All
All
Involved Region or Country North America
Additional Options (RPO)
Condition
TC2 - Hands Free Liftgate
Some customers may comment after recall N222386380 (DRL May Not Deactivate)
was completed, that they now have an issue with the battery going dead.
In addition, they may also have a complaint when they are standing outside the
vehicle, near the liftgate with the fob, the power liftgate will open on its own, which
is unrelated to when the recall N222386380 was completed.
NOTE: If the battery draw is being monitored, when the draw is duplicated, this
issue will cause a battery draw well over 10 amps.
The cause of this concern could be an issue with the K171 Hands Free Liftgate
module repeatedly sending a false wake up request to the BCM commanding
the liftgate to open, but the power liftgate may or may not actually open, see
Important statement below.
In addition to that, after the BCM is updated for recall N222386380 , if the BCM is
woke up by any LIN device, it is now waking up additional modules, causing a higher
amp draw on the battery than it normally would have prior to having the recall
completed.
This will lead to the battery being discharged at a faster rate.
Cause
Important: For the power liftgate to actually open all of the following criteria must be
meet before the power liftgate will actually open from the false hands free request:
1. Vehicle must be in park,
2. Power liftgate switch turned on (max or 3/4),
3. Hands free setting in the radio must be turned on (open or open/closed), and
4. The fob is within 1 meter of the liftgate itself.
Note: The BCM update for N222386380 is not the root cause of the battery draw,
but it is magnifying the draw on the battery if the BCM is inadvertently getting woke
up by a LIN device. In this case, the K171 Hands Free Liftgate module is repeatedly
waking up the BCM, causing a very high amp draw (10+ amps) on the battery.
Correction:
If the customer has both complaints of a battery going dead after recall N222386380 , and unwanted opening of
the power liftgate, then the most likely cause is the K171 Hands Free Liftgate module.
The K171 Hands Free Module will need to be replaced to correct this concern.
In addition, GM engineering is working on new BCM calibrations to reduce the battery draw magni cation when
the BCM is woke up by a LIN device.
Note: The BCM update for N222386380 is not the root cause of the battery draw, but it is magnifying the draw
on the battery if the BCM is inadvertently getting woke up by a LIN device.
If the K171 Hands Free Liftgate module is not available, due to a parts backorder, etc., then the F35RA 10amp
fuse, for the K171 Hands Free Liftgate module, could be removed, which would allow the customer to drive the
vehicle until the part is available.
With the fuse removed, the hands free liftgate feature will not work, but the power liftgate will still function
normally.
In addition, if the truck is equipped with Trailer Tire Pressure Monitor system (RPO UET), then that feature will
also be lost while the fuse is pulled.
Please review this option with the customer if the K171 Hands Free Liftgate module is not readily available.
Tip: The F35RA fuse can also be pulled/removed for testing to see if the issues go away.
Warranty Information
For vehicles repaired under the Bumper-to-Bumper coverage (Canada Base Warranty coverage), use the following
labor operation. Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage
information.
Labor Operation
2063020
Description
Rear Closure Hands Free Sensor Replacement
Version History
Version
Modi ed
1
01/25/2023 - Created on.
© 2023 General Motors. All Rights Reserved.
Labor Time
Use Published Time